Type CM: Single-Threaded Fitting
A single-threaded pipe fitting is attached to the end of a cartridge heater to allow for installation into a threaded hole. This mounting option, available with many terminations, can also be offset from the lead end of the sheath. This option is useful when the lead wires need to be kept away from the heated area. Brass fittings are silver brazed and stainless steel fittings are heli-arc welded. Available with the potting seals listed in the table.
Type CN: Double Threaded Fitting
A double-threaded pipe fitting is attached to the end of a cartridge heater to allow for installation into a threaded hole. Brass fittings are silver brazed and stainless steel fittings are heli-arc welded.
Type TH: Top Hat Screw Plug
This heater has a header cap as an integral part of the fitting. Leads exit through small holes which are sealed with epoxy for moisture protection.
Type BF: Bulkhead Fitting
A 5/8-18 UNF fitting is attached to the end of the cartridge heater to allow for mounting the heater to the wall of a tank or enclosure. Brass fittings are silver brazed and stainless steel fittings are heli-arc welded. Includes a copper washer and jam nut. The lead wires are internally connected. Available with the potting seals listed in the table.
Type MFR: Mounting Flange|Round
Recommended for applications where excessive vibration exists and may cause the heater to back out of its mounting hole. The 16 ga. 304 SS flange is used as a means of securing the cartridge heater in place. The default position of the flange is flush with the lead end. Specify the position of the flange when ordering.
Type MFH: Mounting Flange|Hexagon
A hex shape allows the possibility of using a wrench when removal is tight. The 16 ga. 304 SS flange is used as a means of securing the cartridge heater in place. The default position of the flange is flush with the lead end. Specify the position of the flange when ordering.
Type R3: Angled Sheath Extension
The sheath extension is silver brazed to the cartridge at a 90° angle. The leads are internally connected. The standard sheath extension is 3/8″ long. Specify when ordering if a longer sheath extension is required. If abrasion resistance is required, armor cable or stainless steel wire braid can be attached to the sheath extension. Available with various lead wire types and potted end seals.
Type R4: Bent Cartridge
The heater sheath itself is bent to 90°. The bend is through a required cold section. The standard sheath extension past the bend is 1″. Specify when ordering if a longer sheath is required.
Type LR: Locating Ring
A locating ring can be attached to the heater to aid in positioning the heater for the application. The default position of the ring is 1/4″ from the lead end. Specify the position of the ring when ordering.
Type PS: Pull Strap
A nickel wire rope is a silver brazed to the lead end of the cartridge heater sheath to assist in removing the heater.
Type IS: Incoloy Sheath
The standard sheath material for all Hi-Density Cartridge Heaters except 1″ diameter is 321 stainless steel; standard for 1″ diameter is 304 stainless steel. The Incoloy sheath option is available on all diameters except 1/8″, 5/16″, 8 mm, and 20 mm.
To assist you in selecting the proper sheath material, corrosion-resistant ratings and chemical properties of various heater sheath materials are given in the Engineering Section of the site.
Type DSM: Other Special Sheath Materials
If your application requires a specific alloy sheath material, consult Tempco with your requirements.
Type PAS: Passivation
Passivating is a chemical process accomplished by dipping the heater in a solution of nitric acid. The process removes surface contamination, usually iron so that the optimum corrosion resistance of the stainless steel is maintained.
Type OAL: Special Length Tolerances
If a special length tolerance different than the standard length tolerance specified on pages 2-4 is required, consult Tempco with your requirements.
Type ELP: Electro-Polish
Electro-Polishing is an electro-chemical process that removes surface imperfections and contaminants, enhancing the corrosion resisting ability of the heater sheath.
Type CG: Centerless Grinding
For applications requiring high precision fit and tolerance, the sheath can be centerless ground. Tolerance: ±0.0005 inches (0.013 mm) Specify diameter when ordering.