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Screw Plug Immersion
Heater - all applications must consider the suitability of the
sheath material, the correct watt density, the screw plug size,
available insertion length, and appropriate terminal enclosure.
Call
ASB Heating Elements Limited for Technical Assistance: 1-800-265-9699
Screw
Plug Immersion Heater
Immersion heaters
come in a wide variety of configurations, styles, and shapes.
Our goal is create a simple yet effective design to solve any
fluid-heating environment you have. By selecting the best sheath
material, choosing the optimum fitting method and manufacturing
the elements to any desired watt density, you can expect the
optimum engineered heating solution for your requirements.
Fast delivery gets you this perfect heater almost immediately.
A Screw Plug Immersion Heater
can have from 1 to 3 elements, or blades, either welded or brazed
into the screw plug.
General Purpose Enclosure
(NEMA 1) |
Built-In Thermostat General
Purpose Enclosure (NEMA 1) |
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Built-In Thermostat General
Purpose Enclosure (NEMA 1) |
Explosion
Resistant (NEMA 7) heaters have the suffix ER
Moisture Resistant (Class 4, NEMA 4) heaters have the suffix MR
Our terminal boxes for Explosion
Resistant (ER) and Moisture Resistant (MR) environments are
a similar construction and appearance. The ER boxes undergo
an additional hydrostatic test to ensure they maintain the strength
requirements for Hazardous Locations. All our ER boxes meet
the MR specifications
To distinguish the different
approved heaters we use the suffix ER or MR.
For example:
1. SPC-3060ER is a Hazardous Location design meeting the CSA
Hazardous Location and NEMA 7 approval. It also meets the Class
4 and NEMA 4 designation.
2. SPC-3060MR is a moisture resistant design meeting the Class
4 and NEMA 4 designation.
General Purpose Enclosure
(NEMA 1) |
Built-In Thermostat General
Purpose Enclosure (NEMA 1) |
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Screw
Plug Immersion Heater - Features:
- national pipe thread (NPT)
screw into a mating fitting in your tank
- kilowatt range from low to
medium (100 watts to 30 kw)
- easy to install into your
tank
- 1" to 2 ½"
NPT available
- metric and custom screw plugs
can be made to match existing tank connections
- general purpose terminal enclosure
(NEMA 1), weather resistant terminal enclosure (NEMA 4), and
hazardous location terminal enclosure (NEMA 7), available
- thermocouples, thermostats,
and high limit controls can be built-in
Most Common
Screw Plugs:
- Brass, mild steel or 316
series stainless steel
- Other materials available
- 1", 1 ¼",
1 ½", 2', and 2 ½" NPT are most common
sizes
- Other sizes or metric and
British thread sizes can be made
Most
Common Sheath Material:
- copper
- steel
- stainless steel
- Incoloy 800® & Incoloy
840®
- Inconel 600®
- titanium
- Other sheath material also
offered
Incoloy, Inconel are Inco Ltd
registered trademarks.
Most
Common Terminal Enclosures
- General Purpose NEMA1
- Weather Resistant NEMA 4,
NEMA 4X, class 4
- Hazardous Location NEMA 7
Most Common
Sheath Materials, Application, and Watt Densities
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Sheath
Material
|
Application
|
Watt
Density
Watt.in2
|
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Copper
|
To heat potable
water |
40-72
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Steel
|
Oil |
20-25
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Hydraulic oil |
12-15
|
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Stainless
Steel
|
Process water,
mild acid, de-ionized water |
20-60
|
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Incoloy
800®
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Water, mild
alkaline solutions, air and gases maximum sheath temperature
1400ºF |
10-125
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Incoloy
600®
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Water,
very alkaline solutions, high temperature air and gases
Maximum sheath temperature 1500ºF |
10-50
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Built
in thermocouple options:
- "K" calibrated thermocouple
for high limit sheath protection
- "J" calibrated thermocouple
for temperature control
Built
in thermostats:
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)
Temperature Ranges
- -16 to 40°C (0-100°F)
- 10 to10°C (50-250°F)
- 70 to 280°C (160-540°F)
- 160 to 370°C (320-700°F)
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