FL Style: Flange mounting attachments secure the cartridge
heater firmly in place in applications where there is excessive vibration.
1 ½”diameter is the standard flange size. Flanges with
smaller diameters are generally used as stop rings. |
| Heater Diameter |
NPT Size |
| 1/4" |
1/8" - 27 |
| 3/8" |
1/4 - 18 |
| 1/2" |
3/8" - 18 |
| 5/8" |
1/2" - 14 |
| 3/4" |
3/4" - 14 |
IM Style: The conical thread of NPT fittings (single
or double ended), allow for simultaneous threading and sealing. Brass
or stainless steel fittings can be brazed on the lead end of a cartridge
heater.
|
Selection & installation tips
- Cartridge heaters should
have a tight fit in the receptacle hole. Drilling and reaming to the
next standard size and using a larger cartridge could solve the problem
of loose or worn out holes.
- Lead wires should
be kept away from abrasion, and should not be exposed to temperatures
above 840°F.
- Stocked cartridge
heaters, which have been exposed to air and moisture for a long period
of time, should be energized on a low voltage prior to usage, in order
to eliminate possible moisture contamination. It is always preferable
to stock cartridge heaters in sealed bags.
- Cartridge heaters should
be immersed completely inside th receptacle hole. Proper mounting
attachments can prevent their edging out by vibration. If it is necessary
to have an exposed section, that part should be unheated.
- Receptacle holes
should be properly cleaned prior to the installation of a cartridge heater.
- When designing
molds, it is recommended to make the receptacle cavities such that
they will accommodate cartridge heaters completely and all-the-way-through.
This will later facilitate the removal of cartridge heaters.
- Watt densities
should be kept withing the safe range. This can be done by using either
larger cartridge heaters or as many as it is reasonably possible.
- To prevent short
cycling, the wattage of a cartridge heater should be close to the wattage
required by that specific application.
|
