Thermocouple Extension Cable Type T ANSI Standard High Temperature
PVC Stranded Type
In actual temperature measurement, usually there are long measuring
distance with the measuring device, a thermocouple compensation
wire is generated to compensate the temperature difference caused
by the temperature change between the measuring device and the
thermocouple connecting piece.
The compensation cable has the following advantages: improving
thermocouple temperature measurement line physical properties and
mechanical properties; improving the measurement line flexibility
and making the connection convenient by using multi-strand core or
small-diameter compensation wire; easy to shield external
interference; reducing measuring lines cost.
Thermocouple Cable Grade
A:Extension Grade Cable
Whose wire composition is totally as the same as the thermocouple
wire, remarked by the letter“X”after the thermocouple symbol
number, such as“KX”“JX”“TX”
B:Compensation Grade Cable
Whose wire composition is different from the thermocouple wire, but
its wire electromotive force (EMF) value is the same as
thermocouple wire only at 0-100℃ or 0-200℃. It remarked by the
letter“C”after the thermocouple symbol number, such as“KC”“JC”“TC”
- For cost consideration, when the tested temperature under 200℃,
compensation grade cable is preferred. But compensation grade cable
will occur enormous tested temperature value deviation if the
tested temperature above 200℃. The higher the tested temperature,
the greater deviation be.
- For compensation grade cable, the max testing temperature is less
than 200℃, the bigger the cable, the smaller the signal loss.
- Extension cable and compensation cable comparison:
Performance | Extension Grade | Compensation Grade |
Material | Same as thermocouple | Different from thermocouple |
| EMF Value Feature | Same as the thermocouple’s at certain temperature range | Same as the thermocouple’s |
| Deviation Curve | Nonlinear, varies with temperature | Linear |
| Working Temperature Range | Limited(usual at 100℃) | Unlimited(depend on insulation material temperature bearing) |
| Line Resistance | Low resistance | High resistance |
| Compensation Contact Interference | Different contactor material may cause interference | None |
Accuracy | Low | High |
Price | Low | High(about 1-2 times higher) |
For the extension/compensation cable, the basic structure is
conductor and insulation.
To increase its temperature bearing ability and to install easily,
jacket is applicable.
In the working environment, there are too much factors will
interference the EMF signal, therefore shield layer is practical
way to prevent the cable from interference caused by complex
environment.
