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  • Home
  • Industrial Cylinders
    • Industries Served
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      • Mineral Insulated Thermocouples
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What are thermocouple color codes?

Home » Thermocouples » Thermocouples 101 » Introduction to Thermocouples » What are thermocouple color codes?
Read further about Thermocouples:
  • What do thermocouple letter designations mean?
  • What are thermocouple color codes?
  • What letter of calibration should I use?
  • What is the initial accuracy of temperature sensors?
  • Is there a maximum length for thermocouples and thermocouple wiring?
  • What sheath material is the best for my application?
  • What are the maximum temperatures of thermocouples?
  • What type of junction should I use?
  • What is the response time of mineral insulated thermocouples?
  • Where should my sensor be placed?
  • What should the thermocouple resistance measure?
  • The sensor appears to be reading incorrectly. What might be wrong?
2

What are thermocouple color codes?

Standard ASTM E 230 color coding (United States) is used on all insulated thermocouple wire and extension wire when type of insulation permits. In color coding, the right is reserved to include a tracer to identify the ASTM E 230 type. Thermocouple grade wire normally has a brown overall jacket. For Types B, R and S the color codes relate to the compensating cable normally used.

Various national and international standard agencies have adopted color codes for the identification of thermocouple products. These generally differ from those specified in ASTM E 230. Additionally, the overall extension color code is used to identify connectors to specific thermocouple types.

Click here to download the thermocouple color codes table in PDF format.

2

What are thermocouple color codes?

Standard ASTM E 230 color coding (United States) is used on all insulated thermocouple wire and extension wire when type of insulation permits. In color coding, the right is reserved to include a tracer to identify the ASTM E 230 type. Thermocouple grade wire normally has a brown overall jacket. For Types B, R and S the color codes relate to the compensating cable normally used.

Various national and international standard agencies have adopted color codes for the identification of thermocouple products. These generally differ from those specified in ASTM E 230. Additionally, the overall extension color code is used to identify connectors to specific thermocouple types.

Click here to download the thermocouple color codes table in PDF format.

Read further about Thermocouples:
  • What do thermocouple letter designations mean?
  • What are thermocouple color codes?
  • What letter of calibration should I use?
  • What is the initial accuracy of temperature sensors?
  • Is there a maximum length for thermocouples and thermocouple wiring?
  • What sheath material is the best for my application?
  • What are the maximum temperatures of thermocouples?
  • What type of junction should I use?
  • What is the response time of mineral insulated thermocouples?
  • Where should my sensor be placed?
  • What should the thermocouple resistance measure?
  • The sensor appears to be reading incorrectly. What might be wrong?

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