Mineral Insulated Thermocouples

Bayonett Thermocouple

Mineral Insulated Thermocouple:

These sensors are used in a variety of processes including marine, petrol chemical & power stations as their many characteristics make them a good choice for general and special purpose use, their ruggedness and high temperature characteristics make them a popular choice for a multitude of temperature measuring applications.

Maximum operating temperatures up to 1200 degrees C.


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Category: Mineral Insulated Thermocouples


Thermocouple Reference:

Thermocouple Reference


Cable Diameters Available (mm):

1.0, 1.5, 1.6 ,2.0, 3.0, 3.2, 4.5, 4.8, 6.0, 6.4, 8.0

Supplied in Simplex & Duplex


Types of Hot End Junctions:

Insulated Junction - Insulated hot end junctions are suitable for most temperature applications, especially where low EMF pick up is essential.

Bonded Junction - Bonded or grounded junctions offer a slightly faster temperature response time than the insulated junction type. Not recommended for multi point instrumentation.


Junction TypeAdvantagesDisadvantages

Resistance can be checked before and after installation, to test the integrity of the sheath.

The junction is electrically isolated from the sheath reducing the potential of stray voltages inducing errors.

More shock resistant than the bonded type and will survive better under rapid temperature changes.

Long term drift under cycling conditions in minimised.

Slower response rate than that of bonded or exposed junctions (typically 2 - 3 times longer than bonded)


Quicker response rate than insulated type junctions.

The junction is at the very tip of the probe, intimate contact is achieved for accurate surface measurement.

Is recommended for high pressure applicationsColumn content

More susceptible to electrical noise and associated error.

The thermal expansion of the sheath material may differ from the element to cause mechanical stress and work hardening of the materials.

Faults in the insulation material are more difficult to detect.


Advantage as per IJ but more thermocouples can be manufactured in order to verify readings, i.e. for a 4 core cable with a ICJ 4 thermocouple pairs can be used to verify readings as opposed to the 2 of a standard 4 core unit with IJ hot junction.

Slower response rate than that of bonded or exposed junctions (typically 2 - 3 times longer than bonded).