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IEC 60584 Tolerances TC ext. wire


Thermocouple wire

Thermocouple wire fulfills the requirements on thermocouple material according to the IEC 60584-2. Often the properties of the insulation jacket limits the environmental temperature of the wire. See the data sheet of each product.

Extension cable

Extension cable fulfills the requirements of thermocouple material according to the IEC 60584-2 within a limited temperature range, -25 to 200 °C. Insulation jacket  design may limit the environmental temperature further. As an example extension wire with PVC-jacket is limited to 90 °C while the naked wire can be used within the entire range -25 to 200 °C.

Compensation cable is not made of the genuine thermocouple material. The use of this cable is still more restricted in environmental temperature, typically 0 -100 °C. Today it is mostly used as extension cable for the expensive noble metals thermocouples like the types S and R. For type B plain copper wire can be used as temperatures below 500 °C practically do not generate any output signal. For both categories see Tolerances for extension and compensating cables according to IEC 60584-3.

Extension cable (Pt100)

The number of leads in the cable is crucial for the function. Read more about 2-, 3- and 4-wire configurated instrumentation in the link The effect of 2-, 3- and 4-wire connection of Pt100-sensors.

Metal sheathed cable

The best property of metal-oxide insulated and metal sheathed (MIMS) cable is its ability to withstand moist, high temperature and mechanical stress. It behaves plastically and can be bent with some limitation. It is frequently used as probes for thermocouples and Pt100 sensors.

Thermocouple connectors

Thermocouple connectors are used to avoiding disturbing thermal emf:s where cable splicing is necessary. The used alloys are either thermocouple or compensating materials. See above. Usually cable mounted male and female connectors are used to splice cables while panel jacks are suited for panels or instrumentation boxes.


Panels are practical to use at e. g. test cells where many thermocouples have to be available with great flexibility. Pentronic has a standard programme of panels which can be mounted in order to cover cut outs in instrumentation panels or lids of boxes. Besides we manufacture panels after customers drawings or sketches. Please contact us for more information.

Panel jacks

Panel jacks of different kinds are available covering most instrumentation needs.

Terminal heads

Terminal heads are normally used to connect the sensor signal to a measuring system at processes containing pipes and tanks. Such sensors are comparatively big and the terminal head protects the signal connection from dust, chemicals and other environments depending on material and design.

Moreover it has inside space to allow e.g. a 4-20 mA transmitter to be mounted or just a terminal block. Pentronic offers an extra option by supplying replacable measuring inserts with long connection wires to allow the customer to mount a transmitter or a terminal block at a later time when the final purpose of a spare part sensor is known.