Air Heaters - Watlow

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Air Heaters Air Heaters Sheath Materials

Max. Operating Temperatures °F °C

Typical Max. Watt Densities W/in2 W/cm2

Page

Duct Heaters LDH SERIES and D SERIES Alloy 840 MDH SERIES Alloy 840

1200

650

30

4.7

391

1200

650

26

4.0

405

Finned 375 Finned Strip

Aluminized steel

1100

595

33

5.1

409

FINBAR™ Single-Ended

304 stainless steel

1200

650

50

7.7

415

FIREROD®

Alloy 800

Application Specific

100

15.5

416

Alloy 840

390

200

15

2.3

417

Fiberglass reinforced silicone rubber

500

260

5

0.8

419

Cartridge

Enclosure Heaters WATROD™ Silicone Rubber

Air Heaters

WATLOW®

389

390

WATLOW®

Air Heaters Duct Heaters LDH SERIES and D SERIES Constructed of sturdy 0.430 in. (11 mm) diameter WATROD™ heating elements mounted to a 1/4 in. (6 mm) thick steel flange, duct heaters are easily adapted to many non-pressurized air-heating systems. They are easily installed in applications requiring a wide range of temperature versus air flow combinations. The modular duct heater offers increased reliability. The individual modules are removable through the housing of the assembly, which eliminates the need to pull the complete heater from the duct work. This reduces downtime costs because the heating elements can be replaced individually. Performance improvements include quicker response time and reduced infiltration from the air stream being heated into the electrical enclosure. Watlow® duct heaters offer advantages over gas or oil fired and open coil electric units with: • Installation flexibility—no flues or fuel lines • 100 percent energy efficient—no energy loss up the flue • Universal availability of electricity • Resistance coil in sheath is protected from corrosive environments

LDH SERIES

D SERIES

Threaded Hole

Bussing

Mineral Insulation Single Screw Clamp

Performance Capabilities • Watt densities up to 40 W/in2 (6.2 W/cm2) • Recommended process temperatures from -20 to 1200°F (-29 to 650°C) • Catalog P/N wattages up to 225kW • Voltages up to 600VAC

Features and Benefits Long life alloy 840 sheath • Resists corrosion/oxidation while protecting resistance coils against contamination MgO insulation filled elements compacted to rock hard density • Maximizes dielectric strength, heat transfer and life Field replaceable heating elements • Permits easy service and reduces downtime. Element change-out is made simple by a single screw clamp (D SERIES only) 31/2 in. (90 mm) thick mineral insulation • Keeps wiring cooler and reduces heat loss Silicone resin seals rated to 221°F (105°C) • Protects elements against moisture and other contaminants General purpose terminal enclosure • Offers easy access to wiring

WATLOW®

1/4

in. (6 mm) inside diameter thermowell • Accepts an optional Type J or K thermocouple for accurate sheath temperature sensing (D SERIES only) Rigid stainless steel supports • Prevents element sagging or deformation in various mounting positions 1/4 in. (6 mm) thick steel flange with 3/8 in. (9.5 mm) diameter mounting holes • Easily bolts to the duct wall WATROD hairpins are repressed (recompacted) after bending to assure MgO density • Eliminates hot spots and electrical insulation voids Stock heaters feature from 3 to 60 elements • Meets a wide variety of kilowatt demands One or three phase voltages • Meets local power supplies Maximum 48 amperes per circuit • Complies with National Electrical Code (NEC) Duct heaters with general purpose enclosures meet UL® and CSA component recognition to 480 and 600VAC maximum respectively—UL® and CSA file numbers are E52951 and 31388

391

Air Heaters Duct Heaters LDH SERIES and D SERIES Typical Applications

Required Application Information

• Drying ovens • Autoclaves • Furnaces • Load banks • Heat treating • Reheating • HVAC • Paint drying

• Desired outlet air temperature • Inlet air temperature • Delta T—the temperature difference between inlet and desired outlet temperature • Air volume (CFM/CMM) measured at both inlet temperature and pressure • Air velocity in feet per minute (FPM); meters per minute (MPM) which equals: English

Choosing a Duct Heater The English and metric graphs, shown on the following pages will help you to select the correct duct heater. These graphs include: Watt Density vs. Air Temperature/ Velocity, Watt Density vs. Sheath Temperature and Pressure Drop vs. Air Velocity. These graphs, with the quick formulas on this page, along with information specific to your application, will determine the correct duct heater specifications. However, if engineering assistance is needed, contact your Watlow representative.



FPM =

CFM measured at standard conditions Duct cross section area at heater in ft2

Metric CMM measured at normal conditions MPM = Duct cross section area at heater in m2

• Minimum duct heater wattage (kW). This can be determined by: English

CFM x Delta T (°F) x 1.1 (safety factor)

kW = 3000

Metric kW =

CMM x Delta T (°C) x 1.1 (safety factor) 48

Note: The duct heater, or combination of duct heaters, used for the process should be equal to or exceed the minimum wattage calculation.

392

WATLOW®

Air Heaters Duct Heaters LDH SERIES and D SERIES Watt Density vs. Air Temperature/Velocity curve’s intersecting point. This shows the recommended watt density based on a maximum sheath temperature of 1400°F (760°C). For longer heater life, lower watt densities should be chosen.

cm 2

1.25

2.5

W/c

m2

W/c m2

W/

W/ cm 2

3.1

3.5

400

4.6

6.2

5W

W

/c

/c

m2

/in 2 8W

16 W

1300

WATROD Duct Heater Watt Density Vs. Air Temperature Velocity

500

/in 2

in 2

in 2

W/

W/

20

23

40

1400

30

W /in 2

1500

W /in 2

WATROD Duct Heater Watt Density Vs. Air Temperature Velocity

1600

m2

To decide watt density requirements, first determine the desired outlet air temperature and velocity in feet per minute. Then, follow the lines on the graph for velocity and process temperature to the watt density

s

s

er

er

at

at

He

He

ct

ct

Du

Du

log

g 200

ta Ca

ta Ca

lo

log

lo ta

700 600

ta

er at He ct Du

Du g

800

300

Ca

s

s er at He ct

900

Ca

Air Velocity—FPM

1100 1000

Air Velocity—MPM

1200

500 400

100

300 200 100 100

200

300

400

500

600

700

800

900

1000

1100

100

1200

200

300

400

500

700

600

Process Temperature—°C

Process Temperature—°F

Estimated Sheath Temperature = 760°C

Estimated Sheath Temperature = 1400°F

Watt Density vs. Sheath Temperature The Watt Density vs. Sheath Temperature graph shows the air velocity (FPM or MPM) required to operate a WATROD duct heater at specific watt densities or sheath temperatures. Also depicted is the appropriate watt density vs. sheath temperature at a specified air flow.

56 52

Inlet Temperature at 75°F

48

Watt Density—W/in2

44 40

0

5 15

36

PM

F

0

0 12

9

Inlet Temperature at 25°C 8

PM

F

0 76

PM

F

0

68

PM

F

PM M PM

7

5

23

36

5

5

M

6

47

60

10

Watt Density—W/cm2

WATROD Duct Heater Watt Density Vs. Sheath Temperature

WATROD Duct Heater Watt Density Vs. Sheath Temperature

PM PM M 0 18

M

5 4

90

3 2

PM

18 M

1

o

n

ectio

onv

al C

tur r Na

PM

M

32 28

PM

0F

30

24 20 16 12

P

60 F

tural

Na M or

100

200

300

400

500

600

700

800

900

1000

Sheath Temperature—°C

ion

vect

Con

8 4 0 100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

Sheath Temperature—°F

WATLOW®

393

Air Heaters Duct Heaters LDH SERIES and D SERIES

Air Flow for ≥ 24kW

Air flow for 6 to 18kW

Pressure Drop vs. Air Velocity The rate at which pressure drops through the duct heater is critical for properly sizing blowers and pumps. The Pressure Drop vs. Air Velocity graph gives recommended maximum velocities in feet per minute and meters per minute according to the air velocity and duct heater size. To determine the pressure drop through the duct heater, follow the air velocity (FPM or MPM) over to the appropriate curve, which identifies the duct heater size. Then, take the intersecting point down to the approximate pressure drop value.

1800

er

1700 1600

r D6

1500

ate

1100

500

t ea

lar

bu

u dT

un

r ate

H ct

Du

lar ubu

ater

t He

-D D24

Tub nd

500 450

D ar

l

550

nd T

Rou

tH

uc

600

125

Duc

ea

650

8

D1

e

b

6

rD

te

700

H

ct

Du

Round and FIREBAR Tubular Duct Heaters Pressure Drop vs. Air Velocity

750

2

D1

ular

1000

r ula

Tu

Ro

Duc

1200

d

un

Ro

t He

1300

700

Note: Viewing from the element ends—the recommended air flow direction through element bundle changes at >18kW.

800

nd

u ub

T

lar

bu

ou

R

u dT

un

Ro

400

d oun

R

350

c

Du

rD

uct lar D

bu

d Tu

Roun

18

er D

eat

H uct

ula

Tub

12

rD

ate

e tH

r D24

Heate

5

- D12

300 250

Rou

Air Velocity—FPM

1400

600

>18kW

Air Velocity—MPM

1900

800

6kW 9kW 12kW 18kW

Round and FIREBAR Tubular Duct Heaters Pressure Drop vs. Air Velocity

2000

900

Thermowell

200

400

150

300 200 100 0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

FIREBAR®Duct Heater of Equivalent kW is 30% the Pressure Drop of a Round Tubular Duct Heater 1

100

®

FIREBAR Duct Heater of Equivalent kW is 30% the Pressure Drop of a Round Tubular Duct Heater

1

0.18

Approximate Pressure Drop—Inches of Water

0.20

50 0.005

0.010

0.015

0.020

0.025

0.030

0.035

0.040

0.045

0.050

Approximate Pressure Drop—Kilopascals

1 FIREBAR® flat tubular element duct heaters are available as extended capabilities to enhance your application output or performance. Although duct heaters are not normally constructed with FIREBAR elements, the pressure drop reduction using FIREBAR as a distinct advantage is shown above.

Options Wattages/Voltages To meet specific application needs, voltage and wattage combinations outside stock product parameters are available. For more information about this option, contact your Watlow representative.

394

WATLOW®

Air Heaters Duct Heaters LDH SERIES and D SERIES Options (Continued) Thermocouple Types

Terminal Enclosures In addition to the standard, general purpose terminal enclosure, Watlow offers a moisture resistant optional terminal enclosure to meet specific application requirements.

Thermocouples Type J or K thermocouples, inserted in the thermowell, accurately sense element sheath temperature for over-temperature conditions. To sense process temperature, the sensing element should be located downstream from the duct heater. This will eliminate incorrect sensing caused by radiant heat. Thermocouples are supplied with 120 in. (3050 mm) leads, longer lead lengths are available (this applies to “D” SERIES only). Unless otherwise specified, thermocouples are supplied with temperature ranges detailed on the Thermocouple Types chart. Using a thermocouple requires an appropriate temperature and power controller. These must be purchased separately. Watlow offers a wide variety of temperature and power controllers to meet virtually all applications. Temperature controllers can be configured to accept process variable inputs, too. Contact your Watlow representative for details. To order a thermocouple, add the appropriate suffix letter to the duct heater’s base part number, as indicated on the Ordering Information chart on page 404.

ASTM Conductor Characteristics Type Positive Negative J Iron Constantan (Magnetic) (Non-magnetic) K Chromel® Alumel® (Non-magnetic) (Magnetic)

Recommended 1 Temperature Range °F (°C) 0 to 1000 (-20 to 540) 0 to 2000

(-20 to 1100)

¿1Type J and Type K thermocouples are rated 32 to 1382°F and 32 to 2282°F (0-750°C and 0-1250°C), respectively. Watlow does not recommend exceeding temperature ranges shown on this chart for the tubular product line.

Application Hints • Mount duct heaters horizontally to lower enclosure temperatures and promote unit life. • Orient heating elements as per the air flow illustration on page 394. • Promote heater life by keeping sheath temperature below the 1400°F (760°C) maximum. • Measure process temperature in the outlet stream, away from the heater. • Maintain wiring integrity by keeping enclosure temperature below 400°F (205°C). • Thermal cycling can cause terminations to loosen. Periodically check and tighten all electrical connections. • Size power feeder wires in accordance with NEC and other applicable codes. • Protect employees against electrical shock by properly grounding the unit per NEC specifications.

Thermowell

Thermocouple

Duct heater thermowell holds thermocouple for sensing sheath temperature.

WATLOW®

395

ed y d it en il t b Exapa

Air Heaters

C

Extended Capabilities For Duct Heaters LDH SERIES and D SERIES Performance Capabilities

Options

• Wattages to 2.2 megawatts

Sheath Material

Features and Benefits

Watlow duct heaters can be made with the following sheath materials: • 304, 316, 321 SS • Alloy 800, 840 • Laminated alloy 600 (hi-temp) • Hastelloy C276 Contact your Watlow representative for details and availability.

Ceramic fiber insulation available • Keeps wiring cooler and reduces heat loss Greater than 1/4 in. (6 mm) with 304 or 316 stainless steel flange material • Easily bolts to the duct wall 60 plus element designs available • Meets a wide variety of kilowatt demands

Terminal Enclosures In addition to the standard, general purpose terminal enclosure, Watlow offers the following optional terminal enclosures to meet specific application requirements: • Explosion resistant (contact your Watlow representative) • High-temperature stand-off enclosures

396

WATLOW®

Air Heaters Duct Heaters LDH SERIES

3½ in. (89 mm) Typical

b

D

G Typical

1 3 and 6 element heaters have (1) 1 inch NPT conduit opening;

E

10½ in. (267 mm)

9 in. (229 mm) F



Truck Shipment only

WATLOW®

10½ in. (267 mm)

1

8¾ in. 9, 12 and 15 element heaters have (2) 1 inch NPT conduit (222 mm) openings; 18 element heaters have (2) 11/2 inch NPT conduit Ø 3⁄8 in. ¼ in. (10 mm) 3½ in. openings; 21 element (B= 201/4 in.) heaters have (2) 11/2 inch (6 mm) (89 mm) NPT conduit openings; remaining 21 and 24 element heaters 8 in. (203 mm) have (3) 11/2 inch NPT conduit openings 2 All flanges are 12 inches wide # of # Part Ship Wt. “A” Dim. “B” Dim. “C” Dim. “D” Dim. Elem Volts kW Ph Circ Number Del. lbs (kg) in. (mm) in. (mm) in. (mm) in. (mm) 20 W/in2 (3.1 W/cm2) 3 240 9.0 1 1 LDH9S10S M 55 (25) 281/4 (718) 201/4 (514) 33/4 (95) 71/2 (191) 3 240 9.0 3 1 LDH9S3S M 55 (25) 281/4 (718) 201/4 (514) 33/4 (95) 71/2 (191) 3 480 9.0 1 1 LDH9S11S M 55 (25) 281/4 (718) 201/4 (514) 33/4 (95) 71/2 (191) 3 480 9.0 3 1 LDH9S5S M 55 (25) 281/4 (718) 201/4 (514) 33/4 (95) 71/2 (191) 6 240 18.0 1 2 LDH18S10S M 65 (30) 281/4 (718) 201/4 (514) 63/4 (171) 101/2 (267) M 65 (30) 281/4 (718) 201/4 (514) 63/4 (171) 101/2 (267) 6 240 18.0 3 1 LDH18S3S 6 480 18.0 1 1 LDH18S11S M 65 (30) 281/4 (718) 201/4 (514) 63/4 (171) 101/2 (267) 6 480 18.0 3 1 LDH18S5S M 65 (30) 281/4 (718) 201/4 (514) 63/4 (171) 101/2 (267) 9 240 27.0 1 3 LDH27S10S M 120 (55) 281/4 (718) 201/4 (514) 93/4 (248) 131/2 (343) 9 240 27.0 3 3 LDH27S3S M 120 (55) 281/4 (718) 201/4 (514) 93/4 (248) 131/2 (343) 9 480 27.0 1 3 LDH27S11S M 120 (55) 281/4 (718) 201/4 (514) 93/4 (248) 131/2 (343) M 120 (55) 281/4 (718) 201/4 (514) 93/4 (248) 131/2 (343) 9 480 27.0 3 1 LDH27S5S 12 240 36.0 1 4 LDH36S10S M 135 (62) 281/4 (718) 201/4 (514) 123/4 (324) 161/2 (419) 12 240 36.0 3 2 LDH36S3S M 135 (62) 281/4 (718) 201/4 (514) 123/4 (324) 161/2 (419) 12 480 36.0 1 2 LDH36S11S M 135 (62) 281/4 (718) 201/4 (514) 123/4 (324) 161/2 (419) 12 480 36.0 3 1 LDH36S5S M 135 (62) 281/4 (718) 201/4 (514) 123/4 (324) 161/2 (419) 15 240 45.0 3 5 LDH45S3S M 195 (89) 281/4 (718) 201/4 (514) 153/4 (400) 191/2 (495) 15 480 45.0 1 3 LDH45S11S M 195 (89) 281/4 (718) 201/4 (514) 153/4 (400) 191/2 (495) 15 480 45.0 3 5 LDH45S5S M 195 (89) 281/4 (718) 201/4 (514) 153/4 (400) 191/2 (495) M 205 (93) 281/4 (718) 201/4 (514) 183/4 (476) 221/2 (572) 18 240 54.0 3 3 LDH54S3S 18 480 54.0 1 3 LDH54S11S M 205 (93) 281/4 (718) 201/4 (514) 183/4 (476) 221/2 (572) 18 480 54.0 3 2 LDH54S5S M 205 (93) 281/4 (718) 201/4 (514) 183/4 (476) 221/2 (572) 21 240 63.0 3 7 LDH63S3S M 235 (107) 281/4 (718) 201/4 (514) 213/4 (552) 251/2 (848) 21 480 63.0 1 3 LDH63S11S M 235 (107) 281/4 (718) 201/4 (514) 213/4 (552) 251/2 (848) 21 480 63.0 3 7 LDH63S5S M 235 (107) 281/4 (718) 201/4 (514) 213/4 (552) 251/2 (848) 21 240 79.0 3 7 LDH79S3S M 260 (118) 33 (838) 25 (635) 213/4 (552) 251/2 (848) 21 480 79.0 1 7 LDH79S11S M 260 (118) 33 (838) 25 (635) 213/4 (552) 251/2 (848) 21 480 79.0 3 7 LDH79S5S M 260 (118) 33 (838) 25 (635) 213/4 (552) 251/2 (848) 1 1 21 240 105.0 3 7 LDH105S3S M 290 (132) 40 /2 (1029) 32 /2 (826) 213/4 (552) 251/2 (848) 21 480 105.0 1 7 LDH105S11S M 290 (132) 401/2 (1029) 321/2 (826) 213/4 (552) 251/2 (848) 21 480 105.0 3 7 LDH105S5S M 290 (132) 401/2 (1029) 321/2 (826) 213/4 (552) 251/2 (848) 21 480 131.0 3 7 LDH131S5S M 310 (141) 491/2 (1257) 411/2 (1054) 213/4 (552) 251/2 (848) 24 480 150.0 3 4 LDH150S5S M 330 (150) 491/2 (1257) 411/2 (1054) 243/4 (629) 281/2 (724)

• M - Manufacturing lead times

®

C

Application: High Temperature Air 800°F (427°C) • Welded alloy 840 WATROD elements • Without thermostat • General purpose enclosure • Steel flange

®

B A

“E” Dim. in. (mm)

“F” Dim. “G” Dim. in. (mm) in. (mm)

4 (102) 45/8 (117.5) 3 4 (102) 45/8 (117.5) 3 4 (102) 45/8 (117.5) 3 4 (102) 45/8 (117.5) 3 7 (178) 75/8 (193.7) 3 7 (178) 75/8 (193.7) 3 7 (178) 75/8 (193.7) 3 7 (178) 75/8 (193.7) 3 10 (254) 105/8 (269.9) 3 10 (254) 105/8 (269.9) 3 10 (254) 105/8 (269.9) 3 10 (254) 105/8 (269.9) 3 13 (330) 135/8 (346.1) 3 13 (330) 135/8 (346.1) 3 13 (330) 135/8 (346.1) 3 13 (330) 135/8 (346.1) 3 16 (406) 177/8 (454.0) 3 16 (406) 177/8 (454.0) 3 16 (406) 177/8 (454.0) 3 19 (483) 207/8 (530.2) 3 19 (483) 207/8 (530.2) 3 19 (483) 207/8 (530.2) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 22 (559) 237/8 (606.4) 3 25 (635) 267/8 (682.6) 3

(76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76)

Notes: • See Watt Density vs. Air Temperature/Velocity charts on page 393 to confirm suitability in the application.

397

Air Heaters Duct Heaters

®

LDH SERIES

3½ in. (89 mm) Typical

Application: Medium Temperature Air 750°F (399°C)

b

• Welded alloy 840 WATROD elements • Without thermostat • General purpose enclosure • Steel flange

D

9, 12 and 15 element heaters have (2) 1 inch NPT conduit openings; 18 element heaters have (2) 11/2 inch NPT conduit openings; 21 element (B= 201/4 in.) heaters have (2) 11/2 inch NPT conduit openings; remaining 21 and 24 element heaters have (3) 11/2 inch NPT conduit openings 2 All flanges are 12 inches wide

• M - Manufacturing lead times

398

Truck Shipment only

C

E

9 in. (229 mm)

1 3 and 6 element heaters have (1) 1 inch NPT conduit opening;

# of # Part Ship Wt. Elem Volts kW Ph Circ Number Del. lbs. (kg) 30 W/in2 (4.7 W/cm2) 3 240 14.0 1 3 LDH14SX10S M 55 (25) 3 240 14.0 3 1 LDH14SX3S M 55 (25) 3 480 14.0 1 1 LDH14SX11S M 55 (25) 3 480 14.0 3 1 LDH14SX5S M 55 (25) 6 240 27.0 1 3 LDH27SX10S M 65 (30) 6 240 27.0 3 2 LDH27SX3X M 65 (30) 6 480 27.0 1 2 LDH27SX11S M 65 (30) 6 480 27.0 3 1 LDH27SX5S M 65 (30) 9 240 41.0 3 3 LDH41SX3S M 120 (55) 9 480 41.0 1 3 LDH41SX11S M 120 (55) 9 480 41.0 3 3 LDH41SX5S M 120 (55) 12 240 54.0 3 4 LDH54SX3S M 135 (62) 12 480 54.0 1 3 LDH54SX11S M 135 (62) 12 480 54.0 3 2 LDH54SX5S M 135 (62) 15 240 68.0 3 5 LDH68SX3S M 195 (89) 15 480 68.0 1 3 LDH68SX11S M 195 (89) 15 480 68.0 3 5 LDH68SX5S M 195 (89) 18 240 80.0 3 6 LDH80SX3S M 205 (93) 18 480 80.0 1 6 LDH80SX11S M 205 (93) 18 480 80.0 3 3 LDH80SX5S M 205 (93) 21 240 95.0 3 7 LDH95SX3S M 235 (107) 21 480 95.0 1 7 LDH95SX11S M 235 (107) 21 480 95.0 3 7 LDH95SX5S M 235 (107) 21 240 120.0 3 7 LDH120SX3S M 260 (118) 21 480 120.0 1 7 LDH120SX11S M 260 (118) 21 480 120.0 3 7 LDH120SX5S M 260 (118) 21 480 160.0 3 7 LDH160SX5S M 290 (132) 21 480 200.0 3 7 LDH200SX5S M 310 (141) 24 480 225.0 3 8 LDH225SX5S M 330 (150)

G Typical

10½ in. (267 mm)



®

F

1 Ø 3⁄8 in.

(10 mm)

“A” Dim. in. (mm)

“B” Dim. in. (mm)

281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 281/4 (718) 33 (838) 33 (838) 33 (838) 401/2 (1029) 491/2 (1257) 491/2 (1257)

201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 201/4 (514) 25 (635) 25 (635) 25 (635) 321/2 (826) 411/2 (1054) 411/2 (1054)

10½ in. (267 mm)

8¾ in. (222 mm)

¼ in. (6 mm)

3½ in. (89 mm) 8 in. (203 mm)

“C” Dim. “D” Dim. “E” Dim. in. (mm) in. (mm) in. (mm) 33/4 (95) 33/4 (95) 33/4 (95) 33/4 (95) 63/4 (171) 63/4 (171) 63/4 (171) 63/4 (171) 93/4 (248) 93/4 (248) 93/4 (248) 123/4 (324) 123/4 (324) 123/4 (324) 153/4 (400) 153/4 (400) 153/4 (400) 183/4 (476) 183/4 (476) 183⁄4 (476) 213/4 (552) 213/4 (552) 213/4 (552) 213/4 (552) 213/4 (552) 213/4 (552) 213/4 (552) 213/4 (552) 243/4 (629)

71/2 (191) 4 (102) 71/2 (191) 4 (102) 71/2 (191) 4 (102) 71/2 (191) 4 (102) 101/2 (267) 7 (178) 101/2 (267) 7 (178) 101/2 (267) 7 (178) 101/2 (267) 7 (178) 131/2 (343) 10 (254) 131/2 (343) 10 (254) 131/2 (343) 10 (254) 161/2 (419) 13 (330) 161/2 (419) 13 (330) 161/2 (419) 13 (330) 191/2 (495) 16 (406) 191/2 (495) 16 (406) 191/2 (495) 16 (406) 221/2 (572) 19 (483) 221/2 (572) 19 (483) 221/2 (572) 19 (483) 251/2 (848) 22 (559) 251/2 (848) 22 (559) 251/2 (848) 22 (559) 251/2 (848) 22 (559) 251/2 (848) 22 (559) 251/2 (848) 22 (559) 251/2 (848) 22 (559) 251/2 (848) 22 (559) 281/2 (724) 25 (635)

B A

“F” Dim. “G” Dim. in. (mm) in. (mm) 45/8 (117.5) 3 45/8 (117.5) 3 45/8 (117.5) 3 45/8 (117.5) 3 75/8 (193.7) 3 75/8 (193.7) 3 75/8 (193.7) 3 75/8 (193.7) 3 105/8 (269.9) 3 105/8 (269.9) 3 105/8 (269.9) 3 135/8 (346.1) 3 135/8 (346.1) 3 135/8 (346.1) 3 177/8 (454.0) 3 177/8 (454.0) 3 177/8 (454.0) 3 207/8 (530.2) 3 207/8 (530.2) 3 207/8 (530.2) 3 237/8 (606.4) 3 237/8 (606.4) 3 237/8 (606.4) 3 237/8 (606.4) 3 237/8 (606.4) 3 237/8 (606.4) 3 237/8 (606.4) 3 237/8 (606.4) 3 267/8 (682.6) 3

(76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76) (76)

Notes: • See Watt Density vs. Air Temperature/Velocity charts on page 393 to confirm suitability in the application.

WATLOW®

Air Heaters Duct Heaters

®

®

D SERIES Application: High Temperature Air 800°F (427°C)

a

• Removable alloy 840 WATROD elements • Without thermostat • General purpose enclosure • Steel flange

D

b

C

3½ in. (89 mm) Typical

115⁄8 in. (295 mm)

G Typical

E 9 in. (229 mm)

10½ in. (267 mm)

1 6 and 12 element heaters have (1) 1 inch NPT conduit

opening; 18, 24, 30 and 42 element heaters have (2) 1 inch NPT conduit openings; 36, 48, 54 and 60 element heaters have (2) 1 inch NPT and (2) 11/4 inch conduit openings 2 All flanges are 12 inches wide

# of # Part Elem. Volts kW Ph Circ Number Del. 20 W/in2 (3.1 W/cm2)

Ship Wt. lbs. (kg)

F

3½ in. (89 mm)

3⁄8 in.

(10 mm) Diameter

“A” Dim. in. (mm)

¼ in. (6 mm)

8¾ in. (222 mm)

B A

77⁄8 in. (200 mm)

“B” Dim. “C” Dim. “D” Dim. “E” Dim. “F” Dim. “G” Dim. in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)

6

240 6.0

1

1 D6S10S

M 50 (23) 277/8 (708) 20 (508) 23/4 (70) 61/2 (165) 3 (76) 53/4 (146) 21/2 (64)

6

240 6.0

3

1 D6S3S

M 50 (23) 277/8 (708) 20 (508) 23/4 (70) 61/2 (165) 3 (76) 53/4 (146) 21/2 (64)

6

480 6.0

1

1 D6S11S

M 50 (23) 277/8 (708) 20 (508) 23/4 (70) 61/2 (165) 3 (76) 53/4 (146) 21/2 (64)

6

480 6.0

3

1 D6S5S

M 50 (23) 277/8 (708) 20 (508) 23/4 (70) 61/2 (165) 3 (76) 53/4 (146) 21/2 (64)

12

240 12.0

1

1 D12S10S

M 55 (25) 277/8 (708) 20 (508) 43/4 (121) 81/2 (215) 5 (127) 73/4 (197) 31/2 (89)

12

240 12.0

3

1 D12S3S

M 55 (25) 277/8 (708) 20 (508) 43/4 (121) 81/2 (215) 5 (127) 73/4 (197) 31/2 (89)

12

480 12.0

1

1 D12S11S

M 55 (25) 277/8 (708) 20 (508) 43/4 (121) 81/2 (215) 5 (127) 73/4 (197) 31/2 (89)

12

480 12.0

3

1 D12S5S

M 55 (25) 277/8 (708) 20 (508) 43/4 (121) 81/2 (215) 5 (127) 73/4 (197) 31/2 (89)

18

240 18.0

1

2 D18S10S

M 65 (30) 277/8 (708) 20 (508) 63/4 (171) 101/2 (267) 7 (178) 93/4 (248) 3

(76)

18

240 18.0

3

1 D18S3S

M 65 (30) 277/8 (708) 20 (508) 63/4 (171) 101/2 (267) 7 (178) 93/4 (248) 3

(76)

18

480 18.0

1

1 D18S11S

M 65 (30) 277/8 (708) 20 (508) 63/4 (171) 101/2 (267) 7 (178) 93/4 (248) 3

(76)

277/8 (708)

63/4 (171)

01/2 (267) 1

93/4 (248)

18

480 18.0

3

1 D18S5S

M 65 (30)

24

240 24.0

1

2 D24S10S

M 95 (43) 277/8 (708) 20 (508) 83/4 (222) 121/2 (318) 9 (229) 113/4 (298) 23/4 (70)

24

240 24.0

3

2 D24S3S

M 95 (43) 277/8 (708) 20 (508) 83/4 (222) 121/2 (318) 9 (229) 113/4 (298) 23/4 (70)

24

480 24.0

1

1 D24S11S

M 95 (43) 277/8 (708) 20 (508) 83/4 (222) 121/2 (318) 9 (229) 113/4 (298) 23/4 (70)

24

480 24.0

3

1 D24S5S

M 95 (43) 277/8 (708) 20 (508) 83/4 (222) 121/2 (318) 9 (229) 113/4 (298) 23/4 (70)

30

240 30.0

3

2 D30S3S

M 120

(55) 277/8 (708) 20 (508) 103/4 (273) 141/2 (368) 11 (279) 133/4 (349) 31/4 (83)

30

480 30.0

1

2 D30S11S

M 120

(55) 277/8 (708) 20 (508) 103/4 (273) 141/2 (368) 11 (279) 133/4 (349) 31/4 (83)

30

480 30.0

3

1 D30S5S

M 120

(55) 277/8 (708) 20 (508) 103/4 (273) 141/2 (368) 11 (279) 133/4 (349) 31/4 (83)

20 (508)

7 (178)

3

(76)

CONTINUED

• M - Manufacturing lead times

Truck Shipment only

WATLOW®

Notes: • See Watt Density vs. Air Temperature/Velocity charts on page 393 to confirm suitability in the application.

399

Air Heaters Duct Heaters

®

®

D SERIES Application: High Temperature Air 800°F (427°C)

a

• Removable alloy 840 WATROD elements • Without thermostat • General purpose enclosure • Steel flange

D

b

C

3½ in. (89 mm) Typical

115⁄8 in. (295 mm)

E 9 in. (229 mm)

10½ in. (267 mm)

1 6 and 12 element heaters have (1) 1 inch NPT conduit

opening; 18, 24, 30 and 42 element heaters have (2) 1 inch NPT conduit openings; 36, 48, 54, and 60 element heaters have (2) 1 inch NPT and (2) 11/4 inch conduit openings 2 All flanges are 12 inches wide # of # Part Elem. Volts kW Ph Circ Number Del. 20 W/in2 (3.1 W/cm2)

Ship Wt. lbs. (kg)

F

3⁄8 in. (10 mm) Diameter

“A” Dim. in. (mm)

G Typical

3½ in. (89 mm)

¼ in. (6 mm)

8¾ in. (222 mm)

B A

77⁄8 in. (200 mm)

“B” Dim. “C” Dim. “D” Dim. “E” Dim. “F” Dim. “G” Dim. in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)

36

240 36.0

3

2 D36S3S

M 135 (62) 277/8 (708.0) 20

(508) 123/4 (324) 161/2 (419) 13 (330) 153/4 (400) 33/4 (95)

36

480 36.0

1

2 D36S11S

M 135 (62) 277/8 (708.0) 20

(508) 123/4 (324) 161/2 (419) 13 (330) 153/4 (400) 33/4 (95)

M 135 (62)

277/8 (708.0) 20

(508) 123/4 (324) 161/2 (419) 13 (330) 153/4 (400) 33/4 (95)

M 155 (71)

277/8 (708.0) 20

(508) 143/4 (375) 181/2 (470) 15 (381) 173/4 (451) 41/4 (108)

M 155 (71)

277/8 (708.0) 20

(508) 143/4 (375) 181/2 (470) 15 (381) 173/4 (451) 41/4 (108)

277/8 (708.0) 20

(508) 143/4 (375) 181/2 (470) 15 (381) 173/4 (451) 41/4 (108)

36 42 42

480 36.0 240 42.0 480 42.0

3 3 1

1 D36S5S 2 D42S3S 2 D42S11S

42

480 42.0

3

2 D42S5S

M 155 (71)

48

240 48.0

3

4 D48S3S

M 195 (89) 277/8 (708.0) 20

(508) 163/4 (425) 201/2 (521) 17 (432) 193/4 (502) 43/4 (121)

48

480 48.0

1

2 D48S11S

M 195 (89) 277/8 (708.0) 20

(508) 163/4 (425) 201/2 (521) 17 (432) 193/4 (502) 43/4 (121)

M 195 (89)

277/8 (708.0) 20

(508) 163/4 (425) 201/2 (521) 17 (432) 193/4 (502) 43/4 (121)

M 205 (93)

277/8 (708.0) 20

(508) 183/4 (476) 221/2 (572) 19 (483) 213/4 (552) 51/4 (133)

277/8 (708.0) 20

(508) 183/4 (476) 221/2 (572) 19 (483) 213/4 (552) 51/4 (133)

48 54

480 48.0 240 54.0

3 3

2 D48S5S 3 D54S3S

54

480 54.0

1

3 D54S11S

M 205 (93)

54

480 54.0

3

2 D54S5S

M 205 (93) 277/8 (708.0) 20

(508) 183/4 (476) 221/2 (572) 19 (483) 213/4 (552) 51/4 (133)

60

240 60.0

3

4 D60S3S

M 235 (107) 277/8 (708.0) 20

(508) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

M 235 (107)

277/8 (708.0) 20

(508) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

M 235 (107)

277/8 (708.0) 20

(508) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

327/8 (835.0) 25

(635) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60 60

480 60.0 480 60.0

1 3

4 D60S11S 2 D60S5S

60

240 75.0

3

4 D75S3S

M 260 (118)

60

480 75.0

1

4 D75S11S

M 260 (118) 327/8 (835.0) 25

(635) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 75.0

3

2 D75S5S

M 260 (118) 327/8 (835.0) 25

(635) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 100.0

3

4 D100S5S

M 290 (132) 403/8 (1025.5) 321/2 (826) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 125.0

3

4 D125S5S

M 310 (141) 493/8 (1254.1) 411/2 (1054) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

• M - Manufacturing lead times

400

Truck Shipment only

Notes: • See Watt Density vs. Air Temperature/Velocity charts on page 393 to confirm suitability in the application.

WATLOW®

Air Heaters ®

Duct Heaters

®

D SERIES Application: Medium Temperature Air 750°F (399°C)

a

• Removable alloy 840 WATROD elements • Without thermostat • General purpose enclosure • Steel flange

3½ in. (89 mm) Typical

G Typical

E 9 in. (229 mm)

10½ in. (267 mm)

1 6 and 12 element heaters have (1) 1 inch NPT conduit opening; 18, 24, 30 and 42 element heaters have (2) 1 inch NPT conduit openings; 36, 48, 54, and 60 element heaters have (2) 1 inch NPT and (2) 11/4 inch conduit openings 2 All flanges are 12 inches wide

Del.

C

115⁄8 in. (295 mm)



# of # Part Elem. Volts kW Ph Circ Number 30 W/in2 (4.7 W/cm2)

D

b

Ship Wt. lbs. (kg)

F

3⁄8 in. (10 mm) Diameter

“A” Dim. in. (mm)

“B” Dim. in. (mm)

3½ in. (89 mm)

¼ in. (6 mm)

8¾ in. (222 mm)

B A

77⁄8 in. (200 mm)

“C” Dim. “D” Dim. “E” Dim. “F” Dim. “G” Dim. in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)

6

240

9.0

1

1 D6SX10S

M 50 (23) 277/8 (708) 20 (508) 23/4 (70) 61/2 (165) 3 (76) 53/4 (146) 21/2 (64)

6

240

9.0

3

1 D6SX3S

M 50 (23) 277/8 (708) 20 (508) 23/4 (70) 61/2 (165) 3 (76) 53/4 (146) 21/2 (64)

6

480

9.0

1

1 D6SX11S

M 50 (23) 277/8 (708) 20 (508) 23/4 (70) 61/2 (165) 3 (76) 53/4 (146) 21/2 (64)

6

480

9.0

3

1 D6SX5S

M 50 (23) 277/8 (708) 20 (508) 23/4 (70) 61/2 (165) 3 (76) 53/4 (146) 21/2 (64)

12

240 18.0

1

2 D12SX10S

M 55 (25) 277/8 (708) 20 (508) 43/4 (121) 81/2 (215) 5 (127) 73/4 (197) 31/2 (89)

12

240 18.0

3

1 D12SX3S

M 55 (25) 277/8 (708) 20 (508) 43/4 (121) 81/2 (215) 5 (127) 73/4 (197) 31/2 (89)

12

480 18.0

1

1 D12SX11S

M 55 (25) 277/8 (708) 20 (508) 43/4 (121) 81/2 (215) 5 (127) 73/4 (197) 31/2 (89)

12

480 18.0

3

1 D12SX5S

M 55 (25) 277/8 (708) 20 (508) 43/4 (121) 81/2 (215) 5 (127) 73/4 (197) 31/2 (89)

18

240 27.0

1

3 D18SX10S

M 65 (30) 277/8 (708) 20 (508) 63/4 (171) 101/2 (267) 7 (178) 93/4 (248) 3

(76)

18

240 27.0

3

2 D18SX3S

M 65 (30) 277/8 (708) 20 (508) 63/4 (171) 101/2 (267) 7 (178) 93/4 (248) 3

(76)

18

480 27.0

1

2 D18SX11S

M 65 (30) 277/8 (708) 20 (508) 63/4 (171) 101/2 (267) 7 (178) 93/4 (248) 3

(76)

277/8 (708)

63/4 (171)

101/2 (267)

7 (178) 93/4 (248)

18

480 27.0

3

1 D18SX5S

M 65 (30)

24

240 36.0

1

4 D24SX10S

M 95 (43) 277/8 (708) 20 (508) 83/4 (222) 121/2 (318) 9 (229) 113/4 (298) 23/4 (70)

24

240 36.0

3

2 D24SX3S

M 95 (43) 277/8 (708) 20 (508) 83/4 (222) 121/2 (318) 9 (229) 113/4 (298) 23/4 (70)

24

480 36.0

1

2 D24SX11S

M 95 (43) 277/8 (708) 20 (508) 83/4 (222) 121/2 (318) 9 (229) 113/4 (298) 23/4 (70)

24

480 36.0

3

1 D24SX5S

M 95 (43) 277/8 (708) 20 (508) 83/4 (222) 121/2 (318) 9 (229) 113/4 (298) 23/4 (70)

30

240 45.0

3

5 D30SX3S

M 120

(55) 277/8 (708) 20 (508) 103/4 (273) 141/2 (368) 11 (279) 133/4 (349) 31/4 (83)

30

480 45.0

1

2 D30SX11S

M 120

(55) 277/8 (708) 20 (508) 103/4 (273) 141/2 (368) 11 (279) 133/4 (349) 31/4 (83)

30

480 45.0

3

2 D30SX5S

M 120

(55) 277/8 (708) 20 (508) 103/4 (273) 141/2 (368) 11 (279) 133/4 (349) 31/4 (83)

20 (508)

3

(76)

CONTINUED

• M - Manufacturing lead times

Truck Shipment only

WATLOW®

Notes: • See Watt Density vs. Air Temperature/Velocity charts on page 393 to confirm suitability in the application.

401

Air Heaters Duct Heaters

®

®

D SERIES a

Application: Medium Temperature Air 750°F (399°C) • Removable alloy 840 WATROD elements • Without thermostat • General purpose enclosure • Steel flange

3½ in. (89 mm) Typical

G Typical

E 9 in. (229 mm)

10½ in. (267 mm)

1 6 and 12 element heaters have (1) 1 inch NPT conduit opening; 18, 24, 30 and 42 element heaters have (2) 1 inch NPT conduit openings; 36, 48, 54, and 60 element heaters have (2) 1 inch NPT and (2) 11/4 inch conduit openings 2 All flanges are 12 inches. wide

Del.

C

115⁄8 in. (295 mm)



# of # Part Elem. Volts kW Ph Circ Number 30 W/in2 (4.7 W/cm2)

D

b

Ship Wt. lbs. (kg)

F

3⁄8 in. (10 mm) Diameter

“A” Dim. in. (mm)

“B” Dim. in. (mm)

3½ in. (89 mm)

¼ in. (6 mm)

8¾ in. (222 mm)

B A

77⁄8 in. (200 mm)

“C” Dim. “D” Dim. “E” Dim. “F” Dim. “G” Dim. in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)

36

240 54.0

3

3 D36SX3S

M 135

(62) 277/8 (708.0) 20 (508) 123/4 (324) 161/2 (419) 13 (330) 153/4 (400) 33/4 (95)

36

480 54.0

1

3 D36SX11S

M 135

(62) 277/8 (708.0) 20 (508) 123/4 (324) 161/2 (419) 13 (330) 153/4 (400) 33/4 (95)

36

480 54.0

3

2 D36SX5S

M 135

(62) 277/8 (708.0) 20 (508) 123/4 (324) 161/2 (419) 13 (330) 153/4 (400) 33/4 (95)

42

240 63.0

3

7 D42SX3S

M 155

(71) 277/8 (708.0) 20 (508) 143/4 (375) 181/2 (470) 15 (381) 173/4 (451) 41/4 (108)

42

480 63.0

1

3 D42SX11S

M 155

(71) 277/8 (708.0) 20 (508) 143/4 (375) 181/2 (470) 15 (381) 173/4 (451) 41/4 (108)

42

480 63.0

3

2 D42SX5S

M 155

(71) 277/8 (708.0) 20 (508) 143/4 (375) 181/2 (470) 15 (381) 173/4 (451) 41/4 (108)

48

240 72.0

3

4 D48SX3S

M 195

(89) 277/8 (708.0) 20 (508) 163/4 (425) 201/2 (521) 17 (432) 193/4 (502) 43/4 (121)

48

480 72.0

1

4 D48SX11S

M 195

(89) 277/8 (708.0) 20 (508) 163/4 (425) 201/2 (521) 17 (432) 193/4 (502) 43/4 (121)

48

480 72.0

3

2 D48SX5S

M 195

(89) 277/8 (708.0) 20 (508) 163/4 (425) 201/2 (521) 17 (432) 193/4 (502) 43/4 (121)

54

240 81.0

3

6 D54SX3S

M 205

(93) 277/8 (708.0) 20 (508) 183/4 (476) 221/2 (572) 19 (483) 213/4 (552) 51/4 (133)

54

480 81.0

1

6 D54SX11S

M 205

(93) 277/8 (708.0) 20 (508) 183/4 (476) 221/2 (572) 19 (483) 213/4 (552) 51/4 (133)

54

480 81.0

3

3 D54SX5S

M 205

(93) 277/8 (708.0) 20 (508) 183/4 (476) 221/2 (572) 19 (483) 213/4 (552) 51/4 (133)

60

240 90.0

3

5 D60SX3S

M 235 (107) 277/8 (708.0) 20 (508) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 90.0

1

4 D60SX11S

M 235 (107) 277/8 (708.0) 20 (508) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 90.0

3

4 D60SX5S

M 235 (107) 277/8 (708.0) 20 (508) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

240 115.0 3

10 D75SX3S

M 260 (118) 327/8 (835.0) 25 (635) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 115.0 1

5 D75SX11S

M 260 (118) 327/8 (835.0) 25 (635) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 115.0 3

4 D75SX5S

M 260 (118) 327/8 (835.0) 25 (635) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 150.0 3

4 D100SX5S

M 290 (132) 403/8 (1025.5) 321/2 (826) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146)

60

480 190.0 3

5 D125SX5S

M

• M - Manufacturing lead times

402

Truck Shipment only

310

(141) 4 93/8 (1254.1) 411/2 (1054) 203/4 (527) 241/2 (622) 21 (533) 233/4 (603) 53/4 (146) Notes: • See Watt Density vs. Air Temperature/Velocity charts on page 393 to confirm suitability in the application.

WATLOW®

Air Heaters Duct Heaters LDH SERIES and D SERIES Replacement Elements

Replaceable heating elements provide easy field service and reduce downtime. Element change-out is made simple by a single screw clamp.

To order replacement elements, specify the replacement element part number (from the table) that corresponds to the original Watlow duct heater part number. Then, specify quantity.

Replacement Elements Original Duct Heater Part Numbers

Replacement Element Volts Watts

A Replacement Dimension Element Est. Net Wt. in. (mm) Part Number Delivery lbs (kg)

20 W/in2 (3.1 W/cm2) D6S3 to D60S3

240

1000

277/8

(708.0) D6240

M

1.0 (0.5)

D6S5 to D60S5

480

1000

277/8

(708.0) D6480

M

1.0 (0.5)

1250

327/8

(835.0) D75240

M

1.0 (0.5)

D75S3



240

D75S5

480

1250

327/8

(835.0) D75480

M

1.0 (0.5)

D100S5

480

1667

403/8

(1025.5) D100480

M

1.4 (0.7)

480

2083

493/8

(1254.1) D125480

M

1.7 (0.8)

D6SX3 to D60SX3

240

1500

277/8

(708.0) D6X240

M

1.0 (0.5)

D6SX5 to D60SX5

480

1500

277/8

(708.0) D6X480

M

1.0 (0.5)

1917

327/8

(835.0) D75X240

M

1.0 (0.5)

D125S5 30 W/in2 (4.7 W/cm2)

D75SX3

240

D75SX5

480

1917

327/8

(835.0) D75X480

M

1.0 (0.5)

D100SX5

480

2500

403/8

(1025.5) D100X480

M

1.4 (0.7)

D125SX5

480

3167

493/8

(1254.1) D125X480

M

1.7 (0.8)

• M - Manufacturing lead times

WATLOW®

403

Air Heaters Duct Heaters LDH SERIES and D SERIES Part Number Stock Duct Part Number

Optional Terminal Enclosures

Optional Process Sensors

Sheath Limit Sensors

Stock Duct Part Number Note: Catalog part numbers include optional enclosures. To order optional enclosures or sensors, substitute the appropriate suffix. Optional Terminal Enclosures S =

General purpose enclosure

W =

Moisture resistant enclosure

Note: Catalog listing is a general purpose enclosure. Substitute enclosure options are noted. Optional Process Sensors PJ =

Type J process thermocouple in thermowell

PK =

Type K process thermocouple in thermowell

HJ =

Type J high-limit thermocouple

HK =

Type K high-limit thermocouple

Sheath Limit Sensors

Example Part Number: D6SX10 S J HJ

404

WATLOW®

Air Heaters Duct Heaters MDH SERIES Watlow has developed a line of process air heaters offering improved performance and increased versatility in medium to low temperature applications. The duct heaters are modular and consist of two parts. The first is a 6 kilowatt heater available in either 240 or 480 volts, single- or three-phase. The second part of the heater consists of the electrical housing protecting each module’s termination area and a main flange that bolts into the user’s ductwork. The heater modules are installed in the housing and main flange via rectangular slots in the main flange. The range of modules that can be accommodated in various duct heater assemblies, range from 1-10 modules. A range of 6 to 60 kilowatts, in 6 kilowatt increments is achieved. The new design of the modular duct heater offers increased reliability. The individual modules are removable through the housing of the assembly, which eliminates the need to pull the complete heater from the ductwork. This reduces downtime and costs because the heating elements can be replaced individually. Performance improvements include quicker response time and reduced infiltration from the air stream being heated into the electrical enclosure.

Features and Benefits

Typical Applications • • • • • • • •

Low temperature ovens Parts drying Semiconductor clean room environmental heating Plastic curing Load banks Heated air knives Food dehydration Heat shrink tunnels

Individual modules removable through housing • Reduces downtime for replacement of module Smaller diameter elements (0.315 inch) • Results in a 25 percent lower energy usage on initial heat-up 27 percent reduction in heat-up time as compared to traditional 0.430 inch diameter duct heater elements • Results in faster response time 31 percent lighter weight than traditional tubular duct heaters • Reduces shipping costs and increases worker safety Greater free cross sectional area • Results in lower pressure drop Improved seal between element and electrical housing • Results in lower electrical housing temperature Flexible module wiring • Allows user to sequentially stage modules

WATLOW®

405

Air Heaters Duct Heaters MDH SERIES Velocity vs. Process Temperature

Modular Duct Heater – Velocity vs. Process Temperature 30 W/in2 26 W/in2 23 W/in2

40 W/in2

18 W/in2

1600 1500 1400 1300

Velocity – Feet/Min

1200 1100 1000

8 W/in2

900 800 700 600 500 400 300 200 100 0 0

100

200

400

300

500

700

600

900

800

1000

1200

1100

Process Temperature (°F) Based on 70°F Inlet Air Temperature

Modular Duct Heater – Watt Density vs. Sheath Temperature Watt Density vs. Sheath Temperature 1550 FPM 1200 FPM 760 FPM 600 FPM

50

Watt Density-W/in2

40

300 FPM

30

60 FPM Natural Convection

20

10

0

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

Sheath Temperature (°F)

406

WATLOW®

Air Heaters Duct Heaters

D Typ.

MDH SERIES

®

A

/ in. Typ.

31 2

B

®

115/8 in.

8 in. 101/2 in.

C 213/4 in.

12 in.

/ in.

1 4

261/16 in.

3/8 in. Diameter

Application: Air Heating – Maximum outlet temperature – 750°F (399°C) Watt Est. Dimensions Density No. of No. of Shipping Wt. Part in. 2 kW Volts Phase Circuits Modules lbs Del. Number W/in A B C D 26 6 240 1 1 1 35 M MDH6Sl0 6.50 2.50 5.75 2.50 26 6 240 3 1 1 35 M MDH6S3 6.50 2.50 5.75 2.50 26 6 480 1 1 1 35 M MDH6S11 6.50 2.50 5.75 2.50 26 6 480 3 1 1 35 M MDH6S5 6.50 2.50 5.75 2.50 26 12 240 1 2 2 39 M MDH12Sl0 8.50 4.75 7.75 3.50 26 12 240 3 1 2 39 M MDH12S3 8.50 4.75 7.75 3.50 26 12 480 1 1 2 39 M MDH12S11 8.50 4.75 7.75 3.50 26 12 480 3 1 2 39 M MDH12S5 8.50 4.75 7.75 3.50 26 18 240 1 3 3 46 M MDH18Sl0 10.50 7.00 9.75 3.00 26 18 240 3 1 3 46 M MDH18S3 10.50 7.00 9.75 3.00 26 18 480 1 1 3 46 M MDH18S11 10.50 7.00 9.75 3.00 26 18 480 3 1 3 46 M MDH18S5 10.50 7.00 9.75 3.00 26 24 240 1 4 4 67 M MDH24S10 12.50 9.25 11.75 2.75 26 24 240 3 2 4 67 M MDH24S3 12.50 9.25 11.75 2.75 26 24 480 1 2 4 67 M MDH24S11 12.50 9.25 11.75 2.75 26 24 480 3 1 4 67 M MDH24S5 12.50 9.25 11.75 2.75 26 30 240 3 2 5 84 M MDH30S3 15.75 11.50 15.00 3.56 26 30 480 1 2 5 84 M MDH30S11 15.75 11.50 15.00 3.56 26 30 480 3 1 5 84 M MDH30S5 15.75 11.50 15.00 3.56 26 36 240 3 2 6 95 M MDH36S3 18.00 13.75 17.25 4.13 26 36 480 1 2 6 95 M MDH36S11 18.00 13.75 17.25 4.13 26 36 480 3 1 6 95 M MDH36S5 18.00 13.75 17.25 4.13 26 42 240 3 3 7 109 M MDH42S3 20.25 16.00 19.50 4.69 26 42 480 1 3 7 109 M MDH42S11 20.25 16.00 19.50 4.69 26 42 480 3 2 7 109 M MDH42S5 20.25 16.00 19.50 4.69 26 48 240 3 4 8 137 M MDH48S3 22.50 18.25 21.75 5.25 26 48 480 1 3 8 137 M MDH48S11 22.50 18.25 21.75 5.25 26 48 480 3 2 8 137 M MDH48S5 22.50 18.25 21.75 5.25 26 54 240 3 3 9 144 M MDH54S3 24.75 20.50 24.00 5.81 26 54 480 1 3 9 144 M MDH54S11 24.75 20.50 24.00 5.81 26 54 480 3 2 9 144 M MDH54S5 24.75 20.50 24.00 5.81 26 60 240 3 4 10 165 M MDH60S3 27.00 22.75 26.25 6.38 26 60 480 1 4 10 165 M MDH6OS11 27.00 22.75 26.25 6.38 26 60 480 3 2 10 165 M MDH60S5 27.00 22.75 26.25 6.38

• M - Manufacturing lead times

Truck Shipment only

Options include individual modules with optional general purpose housing, high-temperature thermocouple kit and blank flange modules.

Modular duct heaters with 1 and 2 modules have conduit openings for one, 1 inch NPT fitting. Modular duct heaters with 3, 4, 5, and 7 modules have conduit openings for two, 1 inch NPT fittings. Modular duct heaters with 6, 8, 9, and 10 modules have conduit openings for two, 11/4 inch NPT and two, 1 inch NPT fittings.

WATLOW®

407

Air Heaters Duct Heaters MDH SERIES Individual Module Dimensions Specifications

2¼ in. (57 mm)

TOP

8¼ in. (210 mm) +

7½ in. (191 mm)

Watlow Modular Duct Heater PN XXXXXXXXX 6000 W. 480 V, 3PH, XXXX

• Module rating - 240 or 480VAC, 6kW, three-phase or one-phase • Watt density - 26 W/in2 • Elements - 0.315 inch dia. alloy 840 elements • High-limit thermocouple installed by drilling premarked hole in flange • 6-60kW range when mounted in duct heater assembly

22"

Application Information • Maximum sheath temperature = 1200°F (649°C) • Maximum outlet temperature = 750°F (399°C)

Options Terminal Enclosures Terminal enclosures are available in general purpose and moisture resistant configurations.

High-Limit Thermocouples High-limit thermocouples can be supplied on specified modules or shipped as a kit. Available thermocouples are Types J and K.

Watlow Part Number



M63 M610 M65 M611

6kW, 6kW, 6kW, 6kW,

240V, 240V, 480V, 480V,

3 1 3 1

phase phase phase phase

High Limit Thermocouple Kits MTCJ MTCK

Blank Module Covers

Blank Module Covers

Module covers are available for covering blank slots on the main flange. This allows for adding heater module at a later time to allow higher wattage outputs.

MBLK

408

Description

Replacement Modules

Type J (0-1000°F) Type K (0-2000°F) Cover slots in main flange

WATLOW®

Air Heaters Finned Heaters 375 Finned Strip Heaters Watlow’s 375 finned strip heater is constructed of highly-compacted magnesium oxide (MgO) based insulation, which conducts heat efficiently from the nickel chromium element wire to the sheath. Two-inch wide (51 mm) nickel plated fins are attached to maximize surface contact allowing heat to transfer into the air faster. Lower sheath temperature and element life are maximized by this finned construction.

Performance Capabilities • Aluminized steel sheath temperatures up to 1100°F (595°C) • Watt density up to 33 W/in2 (5.1 W/cm2) • UL® approved up to 240VAC (File No. E52951) • CSA approved up to 600VAC (File No. LR7392)

Aluminized Steel Sheath (Optional 430 SS Sheath)

Features and Benefits Nickel chromium element wire is centered in the heater • Uniformly heats the strip Aluminized steel sheath • Operates at higher temperatures • Resists corrosion more effectively than iron-sheathed heaters Optional 430 stainless steel sheath • Provides a durable solution for highly corrosive environments Welded post terminals • Produces strong, trouble-free connections Available lengths from 51/2 to 48 in. (140 to 1220 mm) • Fits a variety of application needs

WATLOW®

Nickel Plated Fins (Optional 430 SS Sheath)

Nickel Chromium Resistance Wire MgO Insulation

Welded 10-24 Threaded Post Terminals

Typical Applications • Enclosure heating • Load bank resistors • Shrink tunnels • Duct heaters • Space heaters • Drying ovens • Incubators • Air heating • Heat curing • Ink drying • Food warmers • Moisture protection • Dehumidifiers • Stress relieving ovens

409

Air Heaters Finned Heaters 375 Finned Strip Heaters Applications and Technical Data Calculating Watt Density

Formulas

Use the graph and formulas to ensure that the maximum allowable watt density for the heater is not exceeded in the application.

Watt Density =

Wattage Heated Area

Heated Area (Offset Terminals) = =

Open air watt density is calculated for the total heated surface area.

[Overall Length (A) - 4 in.] x 3.75 in. [Overall Length (A) - 102 mm] x 95.3 mm

Heated Area (Parallel Terminals) =

[Overall Length (A) - 3.12 in.] x 3.75 in. = [Overall Length (A) - 79.3 mm] x 95.3 mm

Heated Area (One-on-One Terminals) = [Overall Length (A) - 4.25 in.] x 3.75 in. = [Overall Length (A) - 108 mm] x 95.3 mm Maximum Allowable Watt Density Watt Density—W/cm2 600

5

15 ft/sec (4.6 m/sec) Air Speed 10 ft/sec (3.0 m/sec) Air Speed 5 ft/sec (1.5 m/sec) Air Speed Still Air

500

Ambient Air Temperature—°F

4

3

400

300

200

300 100

200

100

Ambient Air Temperature—°C

2

1

0

0

5

10

15

20

26

30

Watt Density—W/in2

0 ft/sec (0 m/sec) Air Speed

410

WATLOW®

10-24 Threaded Terminals 1.18 in. (30 mm) 7⁄8 in. (22.2 mm)

A

Air Heaters

3⁄8 in. (9.5 mm)

11⁄2 in. (38 mm)

5⁄16 x 1⁄2 in. (7.9 x 13 mm) Mounting Slots

3⁄8 in. (9.5 mm)

1⁄2 in. (13 mm)

11⁄2 in. 3⁄4 in. (38 mm) (19 mm)

Finned Heaters

17⁄8 in. (47.6 mm)

375 Finned Strip Heaters

11⁄4 in. (32 mm) Typ.

Heated Length

Termination Options Offset Terminals

One-on-One Terminals

10-24 Threaded Terminals

10-24 Threaded Terminals

1.18 in. (30 mm)

1.18 in. (30 mm) 7⁄8 in. (22.2 mm)

A 10-24 Threaded Terminals

1.18 in. (30 mm) 3⁄8 in. (9.5 mm)

11⁄2 in. 3⁄4 in. (38 mm) (19 mm) 3⁄8 in. (9.5 mm)

7⁄8 in. 11⁄2 in. (22.2 mm) (38 mm)

5⁄16 x 1⁄2 in. (7.94 x 13 mm) Mounting Slots

7⁄8 in. (22.2 mm)

11⁄2 in. (38 mm) 23⁄4 in. (70 mm)

1⁄2 in. (13 mm)

5⁄16 x 1⁄2 in. (7.94 x 13 mm) Mounting Slots Heated Length

3⁄8 in. (9.5 mm)

7⁄8 in. (22.2 mm)

A 10-24 Threaded Terminals

3⁄8 in. (9.5 mm)

5⁄16 x 1⁄2 in. (7.9 x 13 mm) Mounting Slots A

11⁄2 in. (38 mm) 17⁄8 in. (47.6 mm)

5⁄16 x 1⁄2 in. (7.9 x 13 mm) Mounting Slots Heated Length

Heated Length

3⁄8 in. (9.5 mm)

10-24 Threaded Terminals A

11⁄2 in. (38 mm)

1⁄2 in. (13 mm)

11⁄2 in. (38 mm)

1⁄2 in. (13 mm)

11⁄2 in. (38 mm) 3⁄8 in. (9.5 mm)

Heated Length

A

Heated Length C B

11⁄2 in. (38 mm)

1⁄2 in. (13 mm)

Two 10-24 threaded post terminals are placed one on each end.

In-Line Terminals 10-24 Threaded Terminals 1.18 in. (30 mm)

7⁄8 in. (22.2 mm)

3⁄8 in. (9.5 mm)

1⁄2 in. (13 mm)

11⁄4 in. (32 mm) Typ.

7⁄8 in. 11⁄2 in. (38 mm) (22.2 mm)

3⁄8 in. (9.5 mm)

1⁄2 in. (13 mm)

5⁄16 in. x 1⁄2 in. (7.94 x 13 mm) Mounting Slots

3⁄4 in. (19 mm) 11⁄2 in. (38 mm) 23⁄4 in. (70 mm)

11⁄4 in. (32 mm) Typ.

7⁄8 in. (22.2 mm) 0.950 in. (24.1 mm)

7⁄8 in. (22.2 mm)

A

3⁄8 in. (9.5 mm)

Heated Length

11⁄4 in. (32 mm) Typ.

Two 10-24 threaded post terminals are in-line with each other on the same end.

Threaded Terminals Two 10-24 threaded 10-24 post terminals are used; both 1.18 in. terminals on one end. (30 mm)

1.18 in.3⁄8 in. (30 mm) (9.5 mm)

5⁄16 x 1⁄2 in. (7.9 x 13 mm) Mounting Slots

B

1⁄2 in. (13 mm)

11⁄2 in. 3⁄4 in. (38 mm) (19 mm) 17⁄8 in. (47.6 mm)

Heated Length

C

1.18 in.

(30 mm) Parallel Terminals

11⁄2 in. 3⁄4 in. (38 mm) (19 mm)

1⁄2 in. (13 mm)

Typ.

10-24 Threaded Terminals

11⁄2 in. (38 mm)

11⁄2 in. (38 mm)

11⁄4 in. (32 mm) Typ.

Two 10-24 threaded post terminals are offset from each 23⁄4 in. 11⁄4 in. Heated Length other on the same (70 mm)end. (32 mm)

1.18 in. (30 mm) 3⁄8 in. (9.5 mm)

3⁄8 in. (9.5 mm)

3⁄8 in. (9.5 mm)

11⁄2 in. (38 mm)

1⁄2 in. (13 mm)

11⁄2 in. 3⁄4 in. (38 mm) (19 mm)

7⁄8 in. (22.2 mm) 0.950 in. (24.1 mm)

A

7⁄8 in. (22.2 mm)

A

3⁄8 in. (9.5 mm)

3⁄8 in. (9.5 mm)

5⁄16 x 1⁄2 in. (7.9 x 13 mm) Mounting Slots

7⁄8 in. (22.2 mm) 0.950 in. (24.1 mm)

3⁄8 in. (9.5 mm)

5⁄16 x 1⁄2 in. (7.9 x 13 mm) Mounting Slots 1⁄2 in. (13 mm)

C B

WATLOW®

1⁄2 in. (13 mm)

411

Air Heaters Finned Heaters 375 Finned Strip Heaters Termination Options (Continued) Metallic Terminal Boxes - Variations Metallic terminal boxes are available from 0.020 stock on offset Tk. 5 Fins Per Inch 7/8" 11/2" terminals. Terminal boxes act as a safety feature by (38.1 mm) (22.2 mm) covering the terminals. A conduit may be attached to the " (9.5 mm) 7/8 in. (22.2 mm) diameter holes in the ends box3/8through 11/2" 3 " the/4 box. To order, specify terminal box. (38.1of mm) (19 mm)

/

/

(7.9 mm x 12.7 mm) Mtg. Holes

2½ in. (64 mm)

2 in. (51 mm)

2" (50.8 mm)

1½ in. (38 mm)

2 in. (51 mm)

1/2" (12.7 mm) Typ.

5 16" x 1 2"

2½ in. (64 mm)

2 3/4" (69.8 mm)

Heated Length

2 in. (51 mm)

A

Available on offset terminals from stock and manufactured.

11/4" (31.7 mm) Typ.

10-24 Threaded Terminals

7/8" (22.2 mm)

Available on in-line terminals only. /

7 8"

/

3 8"

13/8" (34.9 mm)

(9.5 mm)

(22.2 mm) Typ.

Accessories Secondary Insulation Bushings

15/8 in. (41.3 mm)

Ceramic Terminal Covers

/ in. (9.5 mm)

3 8

/

1 4 in.-20

/

1 8 in.

x 11/2 in. Threaded Length Screw

(3.2 mm)

/

3 8 in.

(9.5 mm)

Insulators are suitable when air heating and/or voltage to ground is a concern. A secondary insulation bushing kit, part number Z-5230, contains one set of bushings for one heater. To accommodate bushings, 17/32 x 11/16 inch diameter mounting holes must be specified when ordering.

Ceramic terminal covers offer a convenient and economical method to insulate post terminals. A 10-24 screw thread is sized for standard length posts and is supplied as an accessory item and shipped separately. Specify Z-4918 and quantity.

Note: Number of fins are dependent on length of heater.

412

WATLOW®

Air Heaters Finned Heaters 375 Finned Strip Heaters Heater Part Numbers Width in. (mm) Termination 11/2 (38)

Parallel Parallel Parallel Parallel Parallel Parallel Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset

Length in. (mm) Volts 51/2 (140) 51/2 (140) 61⁄2 (152) 61⁄2 (152) 61⁄2 (152) 61⁄2 (152) 71/2 (191) 71/2 (191) 71/2 (191) 81⁄2 (203) 81⁄2 (203) 81⁄2 (203) 81⁄2 (203) 81⁄2 (203) 81⁄2 (203) 81⁄2 (203) 81⁄2 (203) 81⁄2 (203) 81⁄2 (203) 101/2 (267) 101/2 (267) 101/2 (267) 101/2 (267) 101/2 (267) 101/2 (267) 121⁄2 (305) 121⁄2 (305) 121⁄2 (305) 121⁄2 (305) 121⁄2 (305) 121⁄2 (305) 141⁄2 (356) 141⁄2 (356) 141⁄2 (356) 141⁄2 (356) 151/4 (387) 151/4 (387) 151/4 (387)

120 120 120 240 120 240 120 240 240 120 240 120 240 120 240 120 240 120 240 120 240 120 240 120 240 120 240 120 240 120 240 120 240 120 240 120 240 240

Power W/in2 (Watts) (W/cm2) 125 250 150 150 300 300 150 150 200 150 150 175 175 250 250 400 400 500 500 250 250 350 350 400 400 250 250 350 350 500 500 300 300 500 500 325 325 500

14 28 14 14 28 28 12 12 15 10 10 12 12 17 17 27 27 33 33 10 10 14 14 16 16 8 8 12 12 17 17 8 8 13 13 8 8 12

(2.1) (4.3) (2.1) (2.1) (4.3) (4.3) (1.8) (1.8) (2.3) (1.5) (1.5) (1.8) (1.8) (2.6) (2.6) (4.2) (4.2) (5.1) (5.1) (1.5) (1.5) (2.1) (2.1) (2.5) (2.5) (1.2) (1.2) (1.8) (1.8) (2.6) (2.6) (1.2) (1.2) (2.0) (2.0) (1.2) (1.2) (1.8)

Approx. Net Wt. lbs (kg) Delivery 0.5 (0.23) 0.5 (0.23) 0.5 (0.23) 0.5 (0.23) 0.5 (0.23) 0.5 (0.23) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.7 (0.32) 0.9 (0.40) 0.9 (0.40) 0.9 (0.40) 0.9 (0.40) 0.9 (0.40) 0.9 (0.40) 1.0 (0.45) 1.0 (0.45) 1.0 (0.45) 1.0 (0.45) 1.0 (0.45) 1.0 (0.45) 1.2 (0.54) 1.2 (0.54) 1.2 (0.54) 1.2 (0.54) 1.4 (0.64) 1.4 (0.64) 1.4 (0.64)

RS RS RS RS RS RS M M M RS RS RS M RS RS M M RS RS M M RS M RS RS RS RS RS M RS RS M M M M M M RS

Part Number SGA1J5JY2 SGA1J5JY3 SGA1J6AY1 SGA1J6AY2 SGA1J6AY3 SGA1J6AY4 SGA1J7JW1 SGA1J7JW2 SGA1J7JW3 SGA1J8AW2 SGA1J8AW3 SGA1J8AW4 SGA1J8AW5 SGA1J8AW6 SGA1J8AW7 SGA1J8AW8 SGA1J8AW9 SGA1J8AW10 SGA1J8AW11 SGA1J10JW1 SGA1J10JW2 SGA1J10JW3 SGA1J10JW4 SGA1J10JW5 SGA1J10JW6 SGA1J12AW1 SGA1J12AW2 SGA1J12AW3 SGA1J12AW4 SGA1J12AW5 SGA1J12AW6 SGA1J14AW1 SGA1J14AW2 SGA1J14AW3 SGA1J14AW4 SGA1J15EW1 SGA1J15EW2 SGA1J15EW3 CONTINUED

Note: 375 finned strip heaters with one-on-one terminations are available as a manufactured item only. Please contact your Watlow representative for additional information. Note: 5/16 x 1/2 in. (7.9 x 13 mm) mounting slots are supplied on all 375 finned strip heaters.

RAPID SHIP • RS - Next day shipment

up to 10 pieces

• M - Manufacturing lead times

WATLOW®

413

Air Heaters Finned Heaters 375 Finned Strip Heaters Heater Part Numbers (Continued) Width in. (mm) Termination 11/2 (38)

Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset Offset

Length in. (mm) Volts 177/8 (454) 177/8 (454) 177/8 (454) 177/8 (454) 177/8 (454) 177/8 (454) 177/8 (454) 177/8 (454) 177/8 (454) 177/8 (454) 191/2 (495) 191/2 (495) 191/2 (495) 191/2 (495) 191/2 (495) 211⁄2 (533) 211⁄2 (533) 211⁄2 (533) 211⁄2 (533) 233/4 (603) 233/4 (603) 233/4 (603) 233/4 (603) 233/4 (603) 251/2 (648) 251/2 (648) 251/2 (648) 251/2 (648) 251/2 (648) 263/4 (680) 263/4 (680) 301/2 (775) 301/2 (775) 331/2 (851) 357/8 (911) 357/8 (911) 357/8 (911) 381/2 (978) 381/2 (978) 421/2 (1080) 477/8 (1216)

120 240 120 240 120 240 120 240 120 240 240 120 240 240 240 120 240 120 240 240 240 120 240 240 120 240 120 240 240 240 240 120 240 240 120 240 240 120 240 240 240

Power W/in2 (Watts) (W/cm2) 350 350 375 375 500 500 750 750 1000 1000 350 500 500 750 1000 500 500 750 750 500 750 1000 1000 1500 500 500 750 750 1000 700 1000 750 750 750 1000 1000 1500 1000 1500 1500 2250

8 8 9 9 12 12 18 18 24 24 6 9 9 13 17 8 8 12 12 7 10 14 14 20 6 6 9 9 12 8 12 8 8 7 8 8 13 8 11 10 16

(1.2) (1.2) (1.4) (1.4) (1.8) (1.8) (2.8) (2.8) (3.7) (3.7) (.9) (1.4) (1.4) (2.0) (2.6) (1.2) (1.2) (1.8) (1.8) (1.0) (1.5) (2.1) (2.1) (3.1) (0.9) (0.9) (1.4) (1.4) (1.8) (1.2) (1.8) (1.2) (1.2) (1.0) (1.2) (1.2) (2.0) (1.2) (1.7) (1.5) (2.4)

Approx. Net Wt. lbs (kg) Delivery 1.6 (0.73) 1.6 (0.73) 1.6 (0.73) 1.6 (0.73) 1.6 (0.73) 1.6 (0.73) 1.6 (0.73) 1.6 (0.73) 1.6 (0.73) 1.6 (0.73) 1.7 (0.77) 1.7 (0.77) 1.7 (0.77) 1.7 (0.77) 1.7 (0.77) 1.9 (0.86) 1.9 (0.86) 1.9 (0.86) 1.9 (0.86) 2.1 (0.95) 2.1 (0.95) 2.1 (0.95) 2.1 (0.95) 2.1 (0.95) 2.3 (1.00) 2.3 (1.00) 2.3 (1.00) 2.3 (1.00) 2.3 (1.00) 2.4 (1.10) 2.4 (1.10) 2.7 (1.20) 2.7 (1.20) 3.0 (1.40) 3.2 (1.50) 3.2 (1.50) 3.2 (1.50) 3.4 (1.50) 3.4 (1.50) 3.8 (1.70) 4.3 (2.00)

M M M M M RS RS RS M RS M M M RS RS M M M RS M M M M RS M M M RS RS M RS M M M M M M M M RS RS

Part Number SGA1J17RW1 SGA1J17RW2 SGA1J17RW3 SGA1J17RW4 SGA1J17RW5 SGA1J17RW6 SGA1J17RW7 SGA1J17RW8 SGA1J17RW9 SGA1J17RW10 SGA1J19JW2 SGA1J19JW3 SGA1J19JW4 SGA1J19JW5 SGA1J19JW6 SGA1J21AW3 SGA1J21AW4 SGA1J21AW5 SGA1J21AW6 SGA1J23NW3 SGA1J23NW5 SGA1J23NW6 SGA1J23NW7 SGA1J23NW8 SGA1J25JW2 SGA1J25JW3 SGA1J25JW4 SGA1J25JW5 SGA1J25JW6 SGA1J26NW2 SGA1J26NW3 SGA1J30JW1 SGA1J30JW2 SGA1J33JW1 SGA1J35RW1 SGA1J35RW2 SGA1J35RW3 SGA1J38JW2 SGA1J38JW3 SGA1J42JW1 SGA1J47RW2

Note: 375 finned strip heaters with one-on-one terminations are available as a manufactured item only. Please contact your Watlow representative for additional information. Note: 5/16 x 1/2 in. (7.9 x 13 mm) mounting slots are supplied on all 375 finned strip heaters.

RAPID SHIP • RS - Next day shipment

up to 10 pieces

• M - Manufacturing lead times 414

WATLOW®

Air Heaters Finned Heaters FINBAR™ Single-Ended Heaters Composed of aluminized steel fins press fitted to a one-inch single-ended FIREBAR element. The FINBAR™ is designed to improve heat transfer to the air and permits putting more power in tighter spaces—like forced air ducts, dryers, ovens and load bank resistors. Heat transfer, lower sheath temperature and element life are all maximized by its finned construction. Installation is simplified by terminations exiting at one end and mounting accommodations on both ends.

Performance Capabilities • Watt densities up to 50 W/in2 (7.7 W/cm2) • 304 stainless steel sheath temperatures up to 1200°F (650°C) • Voltages up to 480VAC • Amperages up to 48 amperes per heater or 16 amperes per coil

Flexible Lead Wires Aluminized Steel Fins SS Mounting Bracket Slotted End

304 SS Sheath

Features and Benefits Rugged aluminized steel fins • Provides an increase in surface area to approximately 16 square inches for every linear inch of element length. Fins press fitted to the heating element improve heat transfer to the air Single-ended termination • Simplifies wiring and installation Stainless steel mounting bracket, welded to the terminal end, supplied with a slotted end • Allows ease of installation Lavacone seals • Provides protection against humid storage conditions, moisture retardant to 221°F (105°C)

Typical Applications • Forced air heating for dryers, ovens, ducts • Still air heating for ovens, comfort heating • Incubators • Ink drying • Load bank resistors

For detailed product and technical data, see the full FINBAR product section located on pages 112 through 114. WATLOW®

415

Air Heaters FIREROD® Cartridge Heaters The Watlow® FIREROD® cartridge heater incorporates engineering excellence and is supported by almost 60 years of solid industry performance across a broad range of simple and complex applications. As the premier choice in swaged cartridge heating, thousands of industrial manufacturers continue to choose Watlow as their trusted thermal partner and certified cartridge heater supplier. Built using premium materials and tight manufacturing controls, the FIREROD heater provides superior heat transfer, uniform temperatures, resistance to oxidation and corrosion and a long life even at high temperatures. Every system component that leaves our manufacturing facilities meets our strict quality assurance specifications, in addition to those set forth by leading standards and regulating industries. FIREROD offers many delivery programs to meet your needs.

Performance Capabilities • Part temperatures up to 1400°F (760°C) on alloy 800 sheath • Watt densities up to 400 W/in2 (62 W/cm2) • Maximum voltage up to 480V

Features and Benefits Nickel-chromium resistance wire • Ensures even and efficient distribution of heat to the sheath Conductor pins • Provide a metallurgical bond to the resistance wire • Ensure a trouble-free electrical connection Magnesium oxide insulation of specific grain and purity • Results in high dielectric strength and contributes to faster heat-up Alloy 800 sheath • Resists oxidation and corrosion from heat, many chemicals and atmospheres Minimal spacing between the element wire and sheath • Results in lower internal temperature • Accommodates a design with fewer or smaller heaters operating at higher watt densities

MgO Insulation

Conductor Pins

Sheath

End Piece Lead Wires

Lead Wires

Resistance Wire t Hea No tion Sec

International Organization for Standardization (ISO) 9001 certified • Provides confidence that quality and reliability expectations are met UL® and CSA approved flexible stranded wires • Lead insulation rated to temperatures up to 480°F (250°C) Patented lead adapter (LA) method • Allows same day shipment on more than 150,000 configurations of stock FIREROD heaters and lead combinations

For detailed product and technical data, see the full FIREROD product section located on pages 11 through 47. 416

WATLOW®

Air Heaters Enclosure Heaters WATROD Heaters Designed to prevent freezing and condensation in electrical and mechanical housings, the WATROD element is enclosed in a perforated, aluminized-steel bracket.

Performance Capabilities • Watt densities up to 15 W/in2 (2.3 W/cm2) • Wattages up to 1000 watts • UL® and CSA component recognition up to 250VAC

Features and Benefits Stainless steel sheath wall • Resists corrosion and protects the heating coil from exposure Silicone resin seal • Provides protection against humid storage conditions and is effective to 390°F (200°C) Perforated aluminized-steel mounting bracket • Eases installation and helps prevent direct contact with the heating element Stock straight projection Type B #10-32 screw lug terminals • Provides easy electrical connection Made-to-order threaded stud • Provides quick connect and flexible lead wire termination options.

Typical Applications • • • • •

TUBULAR ENCL 4

Main Bracket

0.315 in. (8 mm) Dia. Element

3½ in. (89 mm)

1 in. (25 mm) 1½ in. (38 mm)

7⁄16 in. (11.1 mm)

7 in. (178 mm) 85⁄16 in. (211.1 mm)

Control panels Traffic signal boxes Automated teller machines Switch gear Electronic equipment

Application Hints • Locate heater(s) in the lowest portion of the enclosure to maximize convection heating • Place thermostat(s) in the upper half of the enclosure, away from the heater(s)

WATLOW®

417

Air Heaters Enclosure Heaters WATROD Heaters Technical Information Watt Density Part Number Watts W/in2 (W/cm2) 125VAC 250VAC Delivery 95 100 250 375

4 4 10 15

(0.6) EN951 (0.6) EN10010 (1.6) EN2501 EN25010 (2.3) EN3751 EN37510

RS RS RS RS

Est. Net Wt. lbs (kg) 1.5 (0.7) 1.5 (0.7) 1.5 (0.7) 1.5 (0.7)

RAPID SHIP • RS - Next day shipment up

418

to 5 pieces

WATLOW®

Air Heaters Enclosure Heaters Silicone Rubber Heaters Designed for freeze and condensation protection, Watlow’s enclosure heaters are rugged, reliable and safe to operate. These rectangular-shaped, wire-wound silicone rubber heaters can be ordered individually with adhesive or vulcanized to an aluminum mounting plate. A thermostat can be attached to the heater or mounted separately as shown.

Performance Capabilities • Watt density rating of 5 W/in2 (0.8 W/cm2) • Temperature up to 150°F (66°C)

Features and Benefits Pressure-sensitive adhesive mounting to an aluminum plate or customer cementing • Reduces installation time • Creates easy installation Several standard thermostat set points • Ensures protection against freezing with minimal energy consumption Variety of installation options • Provide the option to utilize cement installation to ensure permanent heater attachment • The pressure sensitive adhesive installation option saves assembly time • Facilitate assembly and disassembly with factory installed aluminum plate mount Remote thermostat option • Provides optimal choice of heater location versus temperature control location Lead options • Allows for a variety of applications • Allows different lead lengths for a variety of wiring requirements Factory pre-wired heater and thermostat • Ensures safety and reliability as there are no exposed electrical connections

WATLOW®

Element Vulcanized Between Two Layers of Silicone Rubber/Fiberglass

0.055 in. (1.4 mm) Thick Heater With Wire-Wound Element PTFE, Silicone, or Neoprene-Insulated Leads Available

Optional Mounting Plate With Heater On Side Opposite Flange Optional Thermostat Mounted to Heater

Typical Applications Freeze or condensation prevention in housings containing electronic equipment including: • Traffic signal boxes • Automated teller machines • Temperature control panels • Gas or liquid control valve housings

419

Air Heaters Enclosure Heaters Silicone Rubber Heaters Options Aluminum Mounting Plate

0.065 in. (1.7 mm) 1/2 in. (13 mm) Heater 0.53 in. (13.5 mm)

2.5 in. (64 mm) Typ. See Note

0.75 in. (19 mm)

7/32 x 1/2 in. (5.6 x 13 mm) Slot Typ.

0.040 in. (1.02 mm) Aluminum

5 in. (127 mm) Typ. See Note ①

1/2 in. (13 mm)

0.75 in. (19 mm)

1.25 in. (32 mm)

/

1 2 in.

(13 mm)

0.065 in. (1.7 mm) 1/2 Heater 0.53 in

0.75

2.5 in. (64 mm) Typ. See Note ②

5 in. (127 mm) Typ. See Note

0.040 in. (1.02 mm) Aluminum

Heater Width

Heater Length

Both vertical and horizontal mounting can be accomplished with enclosure heaters. Mounting plates are 0.040 in. (1.02 mm) thick, specified as #3003 H14 aluminum. The preferred orientation is vertical with a thermostat attached at the lower end (as shown in the drawing). 7/32 x 1/2 in. (5.6 mm) Forx 13 horizontal mounting, a remote thermostat is Slot Typ. recommended. An enclosure heater can be ordered by itself, with PSAS or vulcanized to an aluminum mounting plate. See the Thermostat section below for more information.

¿ ① 4 in. (102 mm) on 5 in. (127 mm) unit. ¡ ② 0.5 in. (13 mm) on 5 in. (127 mm) unit.

Thermostats Mounted on Heater Built-in snap action thermostats from Watlow sense air temperature. See the ordering chart on the following page for available settings.

Remote From Heater For an air sensing thermostat that is separate from the heater, the ST-207E is ideal. It is a modified ST-207 mounted on a 1/32 in. (0.8 mm) thick G-10 circuit board with the thermostat’s metal cap exposed to sense air temperature. The thermostat is placed at the midpoint of the lead length. The sensor can be preset at the temperatures listed for integral sensors.

420

Notes: • On both integral and remote sensors, the thermostat’s exposed metal cap is vulnerable to impact. This could defeat the thermostat’s switching action and cause heater malfunction. • T-10 thermostats are not recommended for enclosure heating applications.

WATLOW®

Air Heaters Enclosure Heaters Silicone Rubber Heaters Technical Data Determining Minimum Wattage Requirements For Enclosures This chart is an excellent guide for determining total wattage requirements for both insulated and uninsulated enclosures, assuming the box is relatively airtight.

For windy conditions, add an additional 50 percent to the wattage requirement listed.

Temperature Rise from Ambient °F (°C)

Total Enclosure Surface Area — Square Feet (Square Meters) 2 3 4 5 6 7.5 9 10 15 20 25 30 40 50 (0.2) (0.3) (0.4) (0.5) (0.6) (0.7) (0.8) (0.9) (1.4) (1.9) (2.3) (2.8) (3.7) (4.7) 20 (11)

30 40 55 70 80 100 120 135 205 270 335 405 540 670 10 10 15 20 20 25 30 35 50 65 80 100 130 160

40 55 80 110 135 160 200 245 270 405 540 670 805 1075 1340 (22) 15 20 30 35 40 50 60 65 100 130 160 195 260 320 60 90 120 160 205 245 300 365 405 605 805 1005 1210 1610 2010 (33) 20 30 55 50 60 75 90 100 145 195 240 290 385 480 80 110 160 215 270 325 400 485 540 805 1075 1340 1610 2145 2680 (44) 30 40 55 65 80 100 115 130 195 260 320 385 515 640 100 (56)

135 200 270 335 405 500 605 670 1005 1340 1675 2010 2680 3350 35 50 65 80 100 125 145 160 240 320 400 480 640 800

120 165 240 320 405 485 600 725 805 1210 1610 2010 2415 3220 4020 (67) 40 60 80 100 115 150 175 195 290 385 480 580 770 960 140 190 280 375 470 565 700 845 940 1410 1880 2345 2815 3755 4690 (78) 45 70 90 115 135 175 205 225 340 450 560 675 900 1120 Uninsulated boxes

Insulated boxes

Silicone Rubber Enclosure Heaters Offering For a complete list of silicone rubber product offerings available for use as an enclosure heater with a thermostat, please refer to the RAPID SHIP offering on page 125.

WATLOW®

421

422

WATLOW®

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Air Heaters - Watlow

Air Heaters Air Heaters Sheath Materials Max. Operating Temperatures °F °C Typical Max. Watt Densities W/in2 W/cm2 Page Duct Heaters LDH SERIES...

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