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Screw Plug Heaters are constructed by brazing or welding
elements into a hex pipe thread. These are intended for
direct immersion into fluids and gases. The heater is to be
installed via a threaded port in the tank or vessel. Screw
plug heaters are available in a variety of pipe thread sizes
and materials. The heating elements are offered in a number
of materials suited to a variety of fluid heating applications.
Terminal housings are available for indoor, outdoor (weatherproof
NEMA 4) and hazardous (NEMA 7) environments. Many
options are available including thermostats, high limit and
process thermocouples or RTD sensors. Since we are a made
to order company, we can offer a large selection of sizes and
configurations which are not listed below. Please contact us
for assistance with your application.
STANDARD PLUG SIZES & MATERIALS
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| NPT Sizes |
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| British Sizes- BSP, BSPP |
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Materials
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| 1”, 1 ¼”, 1 ½”, 2”, 2 ½” |
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1”, 1 ¼”, 1 ½”, 2”, 2 ½”
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| Brass, Steel, Stainless Steel |
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COMMON SHEATH MATERIALS
BUILT IN THREMOSTAT OPTIONS
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Power Ratings |
Up to 240 volts, 25-amp single pole, single throw (SPST)
Up to 240 volts, 25-amp double pole, single throw (DPST)
Up to 600 volts, 15-amp triple pole, single throw (TPST)
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Temperature Ratings |
-16 to 40°C (0-100°F)
10 to 10°C (50-250°F)
70 to 280°C (160-540°F)
160 to 370°C (320-700°F)
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BUILT IN SENSOR OPTIONS
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Sensors |
"K" calibration thermocouple for high limit sheath protection
and fluid sensing and temperature control.
"J" calibration thermocouple for high limit sheath protection
and fluid sensing and temperature control.
100 Ohm RTD Sensor for fluid sensing and temperature control.
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TERMINAL HOUSINGS AND CONSTRUCTIONS
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| 1”
NPT Screw Plug Heater Constructions |
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General Purpose Housings
No Thermostat |
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General Purpose Housings
Buil In Thermostat |
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NEMA 4/NEMA 7 Housings
No Thermostat |
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NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST |
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1/4” NPT Screw Plug Heater Constructions |
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General Purpose Housings
No Thermostat
Single Element Design |
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General Purpose Housings
Buil In Thermostat
Dual Element Design |
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NEMA 4/NEMA 7 Housings
No Thermostat |
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NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST |
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2” NPT Screw Plug Heater Constructions
(2 Elements, Single Phase) |
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General Purpose Housings
No Thermostat |
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General Purpose Housings
Buil In Thermostat |
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NEMA 4/NEMA 7 Housings
No Thermostat |
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NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST |
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2” NPT Screw Plug Heater Constructions
(3 Elements, 1 or 3 Phase) |
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General Purpose Housings
No Thermostat |
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General Purpose Housings
Buil In Thermostat |
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NEMA 4/NEMA 7 Housings
No Thermostat |
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NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST |
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2 1/2” NPT Screw Plug Heater Constructions
(3 Elements, 1 or 3 Phase) |
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General Purpose Housings
No Thermostat |
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General Purpose Housings
Buil In Thermostat |
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NEMA 4/NEMA 7 Housings
No Thermostat |
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NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST |
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NEMA 4/NEMA 7 Housings
Buil In Thermostat 480/600 VAC TPST |
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