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Cartridge heaters

FIREROD

Made-to-Order

Options

Thermocouple Types


ASTM	Conductor Characteristics		Temperature Range
Code	Positive	Negative	°F (°C)
J	Iron	Constantan
	(Magnetic)	(Non-Magnetic)	0 to 1400 (-20 to 760)
	(White)	(Red)
K	Chromel®	Alumel®
	(Non-Magnetic)	(Magnetic)	0 to 2300 (-20 to 1260)
	(Yellow)	(Red)

For other ISA types, contact the Watlow factory in St. Louis, Missouri.

A Style C internal thermocouple is useful in applications where material flows past the end of the heater, as in plastic molding. This junction is embedded in a special end disc. Unless requested, the disc end is not mechanically sealed.

To order, specify internal thermocouple, Style A, B or C and thermocouple ASTM Type J or K.

If not specified, 12 inch (305 mm) power and thermocouple leads are supplied.

Availability

All styles are available on all diameters with the exception of J8 inch (3 mm) diameter, which is available only with Style C.

Internal Thermocouple

A Style A internal thermocouple can be used to evaluate heat transfer efficiency of an application ...a measure that enables you to cut energy costs and increase heater life. This junction is located in the heater core to monitor the internal temperature of the heater. The Style B internal thermocouple gives a good approximation of part temperature and can be located anywhere along the length of the heater. This style may be grounded or ungrounded.

This junction is located adjacent to the inside heater sheath in the center of the heated section unless other wise specified. A J2 inch (13 mm) unheated section is required.

(13 mm) No-Heat

Low electrical leakage is available on M, J2,⁵8 and ³A inch (9,13,16 and 19 mm) diameter FIRERODs. To order, specify low electrical leakage.

Low Electrical Leakage

This construction technique minimizes current leakage of the heating element. It is especially useful in critical applications, like the medical field where low set point ground fault interrupts are used.

Alumel^® and Chromel^® are registered trademarks of Hoskins Manufacturing Co.