Tubular Heaters and Heating Elements
Tubular Heaters and Heating Elements
NPH Tubular Heaters are highly adaptable to most applications where electrical heating is required. They can be used in their straight form or bent into various shapes. Tubular heaters can be used in free air, clamped to a surface, placed inside a groove or cast into metal. These versatile heating elements are available in steel, copper, stainless steel or Incoloy outside sheath and can be utilized in application temperatures of up to 1400°F.
Tubular Heaters Specifications.pdf
NPH Tubular Heater Bend Formations.pdf
Tubular Electric Heaters Wiring Diagrams.pdf
Tubular Heaters- Installation Operation and Maintenance Instuction Mual.pdf
Select high quality sheath material to suit the application.
Precision wound helical Ni chrome resistance wire.
MgO (Magnesium Oxide) powder insulation compacted to provide maximum heat
conductivity and dielectric strength.
Integral cold pin fusion welded to helical resistance wire for optimum current carrying capability.
Mold and die heating
Plastic manifold heating
Pipe or tube heating
High process air heating
Tubular elements of proper rating, material and shape can be
applied to most heating
applications requiring process temperatures to 750°C (1382°F).
Tubular elements may be clamped, immersed, cast into metal or
spaced away from the work as
radiant heaters. Elements can also be positioned in ducts or vessels for heating air or other
Check factory for recommendations if you are unsure of the suitability
of the heater to your
The terminals must be protected at all times from moisture or
vapour. In hazardous locations,
explosion resistant terminal housings must be used. In outdoor locations, moisture resistant
housings are required.
Protect terminals of heating
elements from drippings, condensation, fumes, spray or any other
substance which could result in element contamination.
When melting solids by direct immersion, a surface vent should be
provided to allow gases to
Operate the heater at ½ voltage until melted material completely
covers the heating elements.
Heaters used for this purpose may require special design features. Check factory for
Wiring and Control
Heaters must be wired by qualified personnel to electrical code requirements.
Check supply voltage for compliance with heater nameplate voltage.
A line voltage or pilot duty thermostat should be used to control
the heater. The pilot duty
thermostat must be used with a contactor and (if required) a transformer. Generally, heaters
supplied with built-in thermostats will be factory prewired if suitable for line voltage operation.
Integral thermostats not factory prewired are usually intended for pilot duty.
Heaters with explosion resistant terminal housings must only be
used in locations for which the
heaters are certified.
Check heater nameplate information for approval code.
Never energize an explosion resistant heater unless the terminal
housing cover is properly
Start-Up and Inspection
Check that all terminal connections are tight.
Heaters stored for prolonged periods may absorb moisture. Using a
resistance tester) check the value of the insulation resistance to ground for each circuit.
Initial readings of over 500,000 ohms to ground are normally acceptable. Should lower
readings be observed, check factory for instructions.
DISCONNECT POWER BEFORE SERVICING.
Inspect periodically for corrosion, sludge build-up and for scale removal.
Periodically check electrical connections for tightness.
The diagrams in the link below provide various formations that are possible, kindly chose the formation you require by Type Number and send it to us to enable us to quote.