Compensation Wire For Thermocouple

Cables For Thermocouple

RAW MATERIALS --- Cables --- Compensating Wire For Thermocouple

Compensating Cable

Compensating Cable is a special cable used to extend the transmission distance of thermocouple signals. Its function is to connect thermocouples and temperature measuring instruments to ensure accurate transmission of temperature signals while reducing costs. Compensating cable is divided into Compensating cable and Extension Cable.

Compensating cable is divided into precision grade and ordinary grade according to the tolerance of thermoelectric characteristics. They are divided into general use and heat-resistant use according to the operating temperature range. According to the structural form, they are divided into single-strand core and multi-strand core.

Characteristics of Compensating Cable

The material is different from the thermocouple.

The conductor material of the compensating cable is not necessarily exactly the same as that of the thermocouple, but their thermoelectric properties within a specific temperature range (usually room temperature 0~200℃) match those of the thermocouple to ensure temperature measurement accuracy.
For example, the compensating cable of a type K thermocouple may be made of a copper-nickel alloy, rather than the nickel-chromium-nickel-silicon alloy of the thermocouple itself.

Suitable for long distance transmission, reduce costs.

Since the materials of the thermocouple (such as platinum-rhodium, nickel-chromium, etc.) are relatively expensive, using cheaper compensating cable to extend signal transmission can reduce system costs.
Suitable for short to medium distances (usually tens of meters to hundreds of meters) from thermocouples to control instruments.

Reduce measurement error.

The use of ordinary copper wire may produce additional thermoelectric potential at the contact due to different metals, affecting the measurement accuracy; The compensating cable can ensure the correct transmission of the thermocouple signal.
However, it should be noted that the compensating cable can only remain matched within its specified temperature range, outside of which may lead to increased errors.

Different thermocouple types require corresponding compensating cable.

Various thermocouples (such as K-type, J-type, T-type, S-type, etc.) have their own matching compensating cable and cannot be mixed, otherwise it will cause measurement errors.
The insulation color of compensating cable is usually marked according to international standards (such as IEC, ANSI) to distinguish different types.

Thermocouple Extension Cable vs. Compensating Cable

Item	Compensating Cable	Extension Cable
Conductor material	Inexpensive material that is different in composition from the thermocouple but matches	Same material as thermocouple composition
Applicable temperature	0~200°C(General environment)	Suitable for higher temperatures
Measurement accuracy	Slightly lower accuracy, but sufficient for industrial applications	Higher accuracy for precise measurements
Application scenarios	Long-distance signal transmission, reducing costs	For high-precision measurement is required

If your thermocouple signal requires higher accuracy and longer distance transmission, it is recommended to choose a suitable thermocouple extension cable to ensure measurement accuracy and system stability!

Common Specifications

Use categories	Nominal cross section（mm）2	Single strand core		Multi-strand soft core（R）		insulation layer	protective layer	Upper limit of outer diameter（mm）
		Cable core number（pcs）	Single cable diameter（mm）	Cable core number（pcs）	Single cable diameter（mm）	Thickness （mm）	Thickness（mm）	Platytype		Shielded flat type
		Cable core number（pcs）	Single cable diameter（mm）	Cable core number（pcs）	Single cable diameter（mm）	Thickness （mm）	Thickness（mm）	Single strand core	Multi-strand core	Single strand core	Multi-strand core
General use	0.5	1	0.80	7	0.30	0.5	0.8	3.7×6.4	3.9×6.6	4.5×7.2	4.7×7.4
	1.0	1	1.13	7	0.43	0.7	1.0	5.0×7.7	5.1×8.0	5.8×8.5	5.9×8.8
	1.5	1	0.37	7	0.52	0.7	1.0	5.2×8.3	5.5×8.7	6.0×9.1	6.3×9.6
	2.5	1	1.76	19	0.41	0.7	1.0	5.7×9.3	5.9×9.8	6.5×10.1	6.7×10.7
Heat resistant	0.5	1	0.80	7	0.30	0.5	0.5	2.9×5.0	3.0×5.2	3.7×5.8	3.8×6.0
	1.0	1	1.13	7	0.43	0.5	0.5	3.5×5.7	3.7×6.1	4.3×6.5	4.5×6.9
	1.5	1	1.37	7	0.52	0.5	0.6	4.0×6.5	4.2×6.9	4.8×7.3	5.0×7.7
	2.5	1	1.76	19	0.41	0.5	0.6	4.5×7.3	4.8×7.9	5.3×8.1	5.6×8.7

Insulation Layer and Protective Layer

Insulation Layer and Protective Layer		Operating Temperature
Material	Symbol	Operating Temperature
Polyvinyl Chloride	PVC	－25～105℃
Polyperfluorinated Ethylene Propylene	FEP	－60～205℃
Soluble Polyteflon	PFA	－60～260℃

Order specification

Give an example

KX-HA-FFRP-2*1.5

12-34-5678-9

Used thermocouple index number:

K: Nickel-chromium--nickel-silicon

J: Iron -- copper nickel

B: Platinum-rhodium 30--platinum-rhodium 6

S: Platinum rhodium 10-platinum

R: Platinum-rhodium 13--platinum

N: Nichrome silicon-- Nichrome silicon

E: Nickel-chrome--copper-nickel

T: Copper--copper-nickel (Constantan)

Category：

X: Extensible type

C: Compensating type

Usage：

G: General use

H: Heat resistant

Tolerance level：

A: Fine

B: Common

Insulating material：

V: Polyvinyl chloride

F: Polytetrafluoroethylene

Shielding material：

V: Polyvinyl chloride

B: Alkali free glass filament

F: Polytetrafluoroethylene

Structural feature：

R: Multiple strands of cord

P: Shielded type (tinned copper wire or galvanized steel wire or aluminum-plastic composite tape)

Product specification：

Logarithm times*cross-sectional area

Compensating Cable Use Precautions

Correctly match the thermocouple model. Different types of thermocouples require corresponding compensating cable.
Avoid over-temperature use. Compensating cable can usually only maintain accurate matching within the range of 0~200℃. Too high a temperature will cause errors.
To reduce electromagnetic interference, shielded compensating cable can be used for long-distance transmission to reduce the impact of external electromagnetic interference on the signal.
The connection method is correct, and the positive and negative poles of the thermocouple and the compensating cable must be connected correctly, otherwise it will cause temperature measurement errors.