Watlow WATROD Multicoil Data sheet
Tubular and
Process Assemblies
WATROD Heating
Elements
Multicoil Single- or DoubleEnded Elements
Watlow’s new tubular element with
multiple coils and/or thermocouples
inside one sheath answers the
need for a versatile, innovative
tubular heater. Our new, patentpending method of packaging a
thermocouple inside of a heater
with one or more resistance coils,
gives the ability to sense a heaters’
internal temperature accurately,
every time.
Moreover, this is the first tubular
heater in the industry with threephase capability. The three coil,
three-phase heater will offer a lower
amperage solution while delivering
the full power required in a
compact heater package.
Previously three separate heaters
would have been required to do the
same job; therefore Watlow’s new
multicoil heater capabilities save
money.
Watlow has the capability to put up
to two coils in a 0.375 or 0.430
diameter heater and up to three
coils in a 0.475 or 0.490 diameter
heater. Any one or more of these
coils can be a resistance wire or a
thermocouple. The bending
formations are virtually limitless;
while mounting options are similar to
other Watlow tubular heaters. The
three-phase multicoil heaters can be
single ended with three leads for
three-phase wye hook up. Watlow
recommends using an epoxy
moisture seal or silicone-based seal.
Watlow’s multicoil heaters are
available in all standard materials
such as Incoloy
stainless steel, and can be formed
into almost any configuration. Our
five thermocouple and/or coil
options for multicoil tubular
configurations will meet most
requirements; however, we are
always interested in discussing the
use of different materials or
changing the number of coils and
thermocouples.
®
, 304 and 316
Features and Benefits
• Three-phase capability results
in one element versus three,
lower amperage, reduced installation time and lower overall cost.
• Internal thermocouple allows
responsive and accurate, internal, high-limit sensing and
reduced assembly costs.
• Single ended allows for mount-
ing in a
fitting with three-phase capability.
• Multiple coil options reduce
inventory by allowing dual
voltage capability.
• Versatile forming capabilities
can be formed into virtually any
configuration.
• Internal construction allows
space savings because drilling
and tapping of flange is
unnecessary; plus, the interior
thermocouple eliminates
contamination buildup around the
external sensing tip, reducing the
possibility of false readings.
Applications
• Foodservice
• Process
• Medical
• Milled groove
• Plastics
• Plating
• Oven heating
• Semiconductor
1
inch NPT or
⁄2
3
inch NPT
⁄4
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W A T L O W
Tubular and
Process Assemblies
WATROD Heating
Elements
Multicoil Single- or DoubleEnded Elements
Continued
Options
Option A
3-phase tubular, 0.475 and 0.490
inch diameter.
Option C
1-phase tubular with one resistance
wire and two thermocouples, 0.475
and 0.490 inch diameter.
Option E
Option B
1-phase tubular with two resistance
wires and one thermocouple, 0.475
and 0.490 inch diameter.
Option D
1-phase tubular with three different
one phase circuits, 0.475 and 0.490
inch diameter
Option F
.
WATROD
Sil-A-Blend™is a trademark of Radix Wire
Company.
1-phase tubular with two resistance
coils, 0.375, 0.430, 0.475 and 0.490
inch diameter.
Specifications
Termination style is currently
limited to lead wires 392°F (200˚C)
Sil-A-Blend
Moisture seals are required,
options include:
• Standard epoxy with temperature
rating to 266˚F (130°C). Typical
applications include water/oil
immersion.
• Lavacone with temperature rating
to 300˚F (148.9°C). Typical
application includes air heating.
• High-temp ceramic rated to
2800˚F (1537.8°C).
• Consult factory for other moisture
seal options.
• ULTRAGARD with temperature
rating to 700˚F (375˚C).
™
or 482°F (250˚C) GGS.
1-phase tubular with one resistance
coil and one thermocouple, 0.375,
0.430, 0.475 and 0.490 inch
diameter.
Mounting options include:
• Mounting brackets
• Locator washers
• Mounting collars
• Water-tight bulkheads
Maximum trim length is 237 inches
(6020 mm). Heater designs with trim
length greater than 120 inches
(3048 mm) must be reviewed with
factory.
®
Sheath materials: Incoloy
and 316 stainless steel, consult
factory for other sheath material
options.
Internal thermocouple options:
Type K is used, consult factor y for
Type J ther mocouple options.
U.S. Patent Pending
, 304
277
Tubular and
Process Assemblies
WATROD Heating
Elements
Specifications
Double-Ended Single-Ended
Applications Direct immersion Vacuums Platens
Hot runner mold (manifold) Semiconductor Forced air
Forced air Deicing antennas
Ovens Plastic wrap cutting
Radiant Seal bars
Clamp-on
Watt Density Stock: up to 60 (9.3) Stock: up to 20 (3.1)
2
W/in
(W/cm2) Made-to-Order (M-t-O): up to 120 (18.6) M-t-O: up to 45 (6.9)
Element Diameters Dia.
inch (mm) 0.210 0.660 (5.3) (4.26) 0.375 1.178 (9.5) (7.600)
and Surface Area per Linear 0.260 0.817 (6.6) (5.27) 0.430 1.351 (10.9) (8.717)
inch (cm) 0.315 0.990 (8.0) (6.38) 0.475 1.492 (12.0) (9.626)
Diameter Tolerance 0.332 1.043 (8.4) (6.73) 0.490 1.539 (12.4) (9.930)
± 0.005 inch (0.13 mm) 0.375 1.178 (9.5) (7.60) 0.625 1.963 (15.9) (12.665)
0.430 1.351 (10.9) (8.72)
0.475 1.492 (12.0) (9.63)
0.490 1.539 (12.4) (9.93)
0.625 1.963 (15.9) (12.66)
Sheath Materials Stock: Incoloy
Maximum Operating 316 stainless steel 1200°F (650°C)
Temperature Steel 750°F (400°C)
M-t-O: Inconel
Sheath Length By Diameter
inch (mm) Dia.
Stock: Stock:
0.260 20 to 80 (6.6) (510 to 2030) 0.375 15 to 40 (9.5) (380 to 1015)
0.315 12 to 100 (8.0) (305 to 2540)
0.375 11 to 180 (9.5) (275 to 4555)
0.430 15 to 120 (10.9) (380 to 3050)
0.475 20 to 157 (12.0) (510 to 3990)
M-t-O: M-t-O:
0.210 9 to 130 (5.3) (230 to 3300) 0.375 11 to 125 (9.5) (280 to 3175)
0.260 9 to 275 (6.6) (230 to 6980) 0.430 11 to 106 (10.9) (280 to 2690)
0.315 9 to 270 (8.0) (230 to 6850) 0.475 11 to 125 (12.0) (280 to 3175)
0.332 9 to 125 (8.5) (230 to 3170) 0.490 11 to 125 (12.4) (280 to 3175)
0.375 11 to 325 (9.5) (280 to 8255) 0.625 11 to 125 (15.9) (280 to 3175)
0.430 11 to 268 (10.9) (280 to 6810)
0.475 11 to 275 (12.0) (280 to 6985)
0.490 11 to 275 (12.4) (280 to 6985)
0.625 11 to 275 (15.9) (280 to 6985)
2
in
®
Copper 350°F (175°C)
®
600 1800°F (980°C) M-t-O: Incoloy
®
Incoloy
316 stainless steel 1200°F (650°C) 304 stainless steel 1200°F (650°C)
304 stainless steel 1200°F (650°C) Steel 750°F (400°C)
Steel 750°F (400°C)
Copper 350°F (175°C)
®
Monel
Titanium Consult Factory
Sheath Sheath Sheath Sheath
Length Dia. Length Dia. Length Dia. Length
Dia. (mm) cm
1600°F (870°C) Stock: Incoloy
1600°F (870°C) 316 stainless steel 1200°F (650°C)
Consult Factory
2
Dia. in
2
®
®
Dia. (mm) cm
1200°F (650°C)
1600°F (870°C)
2
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W A T L O W
Tubular and
Process Assemblies
WATROD Heating
Elements
Specifications
Double-Ended Single-Ended
Minimum No-Heat Length Sheath No-Heat Sheath No-Heat Sheath No-Heat Sheath No-Heat
inch (mm) Length Length Length Length Length
11 to 20 1 (280 to 510) (25) 11 to 20 11⁄2 (280 to 5100) (38)
21 to 50 1
51 to 80 1
81 to 110 1
111 to 140 1
141 to 170 2 (3580 to 4320) (51)
171 to 200 2
201 & up 2
Maximum V oltage/Amperage
By Dia. 0.260 (6.6) 250VÅ(ac) 15 0.375 (9.5) 480VÅ(ac) 30
inch (mm) 0.315 (8.0) 480VÅ(ac) 30 0.430 (10.9) 480VÅ(ac) 30
Ohms Per Heated Inch Dia.
By Dia. 0.210 0.100Ω 16Ω
inch 0.260 0.080Ω 25Ω 0.375 0.200Ω 34Ω
Terminations Stock: Threaded stud Stock: Flexible lead wires
Seals Stock: Silicone resin 390°F (200°C) Stock: Silicone resin 390°F (200°C)
Mounting Options Threaded bulkheads Threaded bulkhead
Surface Finish Options Belt polishing Bright Anneal Belt polishing Bright Anneal
Agency Recognition UL
Dia. Volts Amps Dia. Volts Amps
0.332 (8.5) 480VÅ(ac) 30 0.475 (12.0) 480VÅ(ac) 30
0.375 (9.5) 480VÅ(ac) 30 0.490 (12.4) 480VÅ(ac) 30
0.430 (10.9) 600VÅ(ac) 40 0.625 (15.9) 480VÅ(ac) 30
0.475 (12.0) 600VÅ(ac) 40
0.490 (12.4) 600VÅ(ac) 40
0.625 (15.9) 600VÅ(ac) 40
0.315 0.050Ω 25Ω 0.430 0.200Ω 34Ω
0.332 0.050Ω 23Ω 0.475 0.200Ω 34Ω
0.375 0.020Ω 18Ω 0.490 0.200Ω 34Ω
0.430 0.025Ω 30Ω 0.625 0.200Ω 34Ω
0.475 0.030Ω 30Ω
0.490 0.030Ω 30Ω
0.625 0.030Ω 25Ω
M-t-O: Threaded stud M-t-O: Flexible lead wires
M-t-O: Ceramic base 2800°F (1535°C) M-t-O: Silicone rubber
Mounting brackets Locator washers
Locator washers Mounting collars
Mounting collars
Passivation Passivation
®
Component to 480VÅ(ac) (file # E52951/E56488) UL®Component to 240VÅ(ac) (file # E52951)
CSA Component to 600VÅ(ac) (file # 31388) CSA Component to 240VÅ(ac) (file # 31388)
1
⁄4
1
⁄2 (1295 to 2030) (38) 51 to 80 21⁄8 (1295 to 2030) (54)
5
⁄8
3
⁄4 (2820 to 3555) (44) 111 to 125 25⁄8 (2820 to 3175) (67)
1
⁄4 (4345 to 5080) (57)
1
2 (5105 & up) (64)
⁄
Minimum Maximum Dia. Minimum Maximum
Screw lug (plate) Rubber overmolds
Quick connect (spade)
Flexible lead wires
Rubber overmolds
ULTRAGARD 700°F (375°C) ULTRAGARD 700°F (375°C)
Ceramic-to-metal 500°F (260°C) Silicone resin 392°F (200°C)
Silicone rubber
Silicone resin 392°F (200°C)
Epoxy resin 266/350°F (130/177°C)
(535 to 1270) (32) 21 to 50 1
(2055 to 2795) (42) 81 to 110 2
1
2 inch (13 mm) No-heat length on all blunt ends
⁄
(RTV)
500°F (260°C) Epoxy resin 266/350°F (130/177°C)
Length Length Length
3
⁄4
3
⁄8
(533 to 1270) (44)
(2055 to 2795) (60)
(RTV)
500˚F (260°C)
➀
WATROD
➀ Not applicable to 0.375 inch diameter single-ended WATROD
279
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