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What should the thermocouple resistance measure?

Home » Thermocouples » Thermocouples 101 » Introduction to Thermocouples » What should the thermocouple resistance measure?
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?
11

What should the thermocouple resistance measure?

Although resistance cannot confirm the alloy has the correct thermoelectric specifications, it will check to see if other undesirable characteristics like opens, poor welds, or corrosion of the wires are present. Always measure the resistance of the thermocouple out of the application so the EMF output is not in conflict with the resistance meter.

Ohms per Double Feet

Long lead wire runs, or the use of analog based instrumentation, make conductor resistance an important consideration in selecting the wire gauge best suited for your application. The table below lists the nominal ohms per double feet for thermocouple and thermocouple extension wire. Ohms per double feet is the total resistance, in ohms, for both conductors, per foot.

Click here to donwload the Nominal Resistance for Thermocouple Alloys table in PDF format.

11

What should the thermocouple resistance measure?

Although resistance cannot confirm the alloy has the correct thermoelectric specifications, it will check to see if other undesirable characteristics like opens, poor welds, or corrosion of the wires are present. Always measure the resistance of the thermocouple out of the application so the EMF output is not in conflict with the resistance meter.

Ohms per Double Feet

Long lead wire runs, or the use of analog based instrumentation, make conductor resistance an important consideration in selecting the wire gauge best suited for your application. The table below lists the nominal ohms per double feet for thermocouple and thermocouple extension wire. Ohms per double feet is the total resistance, in ohms, for both conductors, per foot.

Click here to donwload the Nominal Resistance for Thermocouple Alloys 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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