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FLANGE IMMERSION HEATERS
Applications
• Water
• Deionized
• Demineralized
• Clean
• Potable
• Process
• Industrial water rinse tanks
• Vapor degreasers
• Hydraulic oil, crude, asphalt
• Lubricating oils at API specified watt densities
• Air and gas flow
• Caustic solutions
• Chemical baths
• Process air equipment
• Boiler equipment
• Freeze protection of any fluid
• Anti-freeze (glycol) solutions
• Paraffin
Options
Terminal Enclosures
General purpose terminal enclosures, without thermostats,
are standard on all flange immersion heaters. Optional
terminal enclosures include:
• General purpose (NEMA 1) with a single or double pole
thermostat.
• Moisture resistant (NEMA 4- steel). Available with or
without a single or double pole thermostat.
• Corrosion resistant (NEMA 4X). Available with or without a
single or double pole thermostat.
• Explosion resistant (NEMA 7) class 1 groups C and D.
Available with or without a single or double pole
thermostat.
• Explosion / moisture resistant (NEMA 7/4) combinations.
Available with or without a single or double pole
thermostat.
• For class 1, group B enclosures, consult your Watlow
representative.
Enclosure Enhancements
• Enclosure heater to solve condensation and freeze
problems
• Power distribution blocks to facilitate power feed line wiring
Caution!
Explosion-resistant terminal enclosures are intended to
provide explosion containment in the electrical
termination/wiring enclosure only. No portion of the assembly
outside of this enclosure is covered under this NEMA rating.
NEMA rating effectiveness may be comprised by abuse or
misapplication.
Stand-off Terminal Enclosures
Stand-off terminal enclosures provide an air-insulating barrier
between the flange and terminal enclosure by mounting the
terminations and wiring away from the flange. Stand-off
terminal enclosures are recommended whenever a process
operating temperature exceeds 400
o
F (205
o
C). This helps
minimize terminal enclosure temperatures.
CSA Certified Enclosures
CSA certified moisture and/or explosion resistant terminal
enclosures protect wiring in hazardous gas environments.
These terminal enclosures, covered under CSA file number
61707, are available on all WATROD and FIREBAR flange
heaters. For additional information, consult your Watlow
representative.
Thermostats
To provide process temperature control, Watlow offers
optional single pole, single throw (SPST) and double pole,
single throw (DPST) thermostats.
Unless otherwise specified, thermostats are mounted inside
the terminal enclosure.
Thermocouples
ANSI Type J or K thermocouples offer more accurate
sensing of process and/or sheath temperatures. A
thermocouple may be inserted into the thermowell or
attached to the heater's sheath.
Thermocouples are supplied with 120 inch (3050 mm) leads
(longer lead lengths are available).
Using a thermocouple requires an appropriate temperature
and power control.These must be purchased separately.
Watlow offers a wide variety of temperature and power
controls to meet virtually all applications. Temperature
controls can be configured to accept process variable inputs,
too.
Wattages and Voltages
Watlow routinely supplies flange immersion heaters with 240
to 480VAC as well as wattages from 150 watts to 1
megawatt. If required, Watlow will make heaters with voltage
up to 600VAC and wattage beyond one megawatt. For more
information on special voltage and wattage configurations,
consult your Watlow representative.