Cable and wire technology

thermocouple extension wire color code

The implementation standards for compensating wires for thermocouples mainly include China's recommended standard GB/T4989-94 (equivalent to IEC60584-3 standard) "Compensated wire for thermocouple" and mechanical industry recommended standard JB/T9496-1999 "Tungsten-rhenium thermocouple Compensation wire. According to the above two standards, the main types of thermocouple compensation wires, the specifications and requirements for the use of thermocouples, materials and insulation layers are shown in the table.

thermocouple extension wire color code and other parameters:

Compensation wire type

Equipped with thermocouple

Thermocouple indexing number

Compensation wire alloy wire

Insulation color

 

 

 

Positive level

Negative level

Positive level

Negative level

SC

Platinum rhodium 10-platinum thermocouple

S

SPC (copper)

SNC (copper nickel)

red

green

RC

Platinum and rhodium 13 thermocouple

R

RPC (copper)

RNC (copper nickel)

red

green

KCA

Nickel-chromium-nickel silicon thermocouple

 

 

K

KPCA (iron)

KNCA (copper nickel)

red

blue

KCB

 

 

KPCB (copper)

KNCB (copper nickel)

red

blue

KX

 

 

KPX (nickel chrome)

KNX (nickel silicon)

red

black

NC

Nickel-chromium-silicon-silicon thermocouple

 

N

NPC (iron)

NNC (copper nickel)

red

gray

NX

 

 

NPX (nickel chrome silicon)

NNX (nickel silicon)

red

gray

EX

Nickel-chromium-copper-nickel thermocouple

E

EPX (nickel chrome)

ENX (copper nickel)

red

Brown

JX

Iron-copper nickel thermocouple

J

JPX (iron)

JNX (copper nickel)

red

purple

TX

Copper-copper nickel thermocouple

T

TPX (copper)

TNX (copper nickel)

red

White


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