Type TJ1 and TK1: Grounded at Disc End
The thermocouple junction is grounded to the sheath at the disc end and packed with MgO. The concave end disc is filled with silver solder and ground flat. When inserted into a flat end blind hole, it will provide fast responsive temperature readings. Widely used in Hot Runner mold probes.
Type TJ2 and TK2: Ungrounded at Disc End
The thermocouple junction is ungrounded, located at the end of the heater section, 1/8″ behind the end disc and packed with MgO. Only provides reference temperature reading of the part being heated – slower response.
Type TJ3 and TK3: Ungrounded at Center
The thermocouple junction is ungrounded and is located in the center of the length and diameter of the cartridge heater. It provides internal temperature readings of the heater core. Generally used for research applications and is not recommended for controlling process temperatures.
Type TJ4 and TK4: Grounded at Center
The thermocouple junction is grounded to the sheath in a 1/2″ unheated section located in the center of the cartridge length unless otherwise specified. It provides good temperature readings with quick responses.
Type TJ5 and TK5: Grounded at Lead End
The thermocouple junction is grounded to the sheath at the lead end. A minimum of 3/8″ of cold section is required. It provides good temperature readings with quick response.