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What should I pay attention to when using thermocouples?

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Deterioration of thermocouples is a quantitative process that is difficult to quantify. It varies with thermocouple type, diameter, operating temperature, atmosphere and time.

 

Correct use of thermocouple can prolong its life, so what problems should be paid attention to when using it, please take a look at the precautions:

 

Precautions for Using Thermocouples

 

1. The nominal pressure of the thermocouple: generally refers to the static external pressure that the protection tube can withstand at the working temperature and rupture.

 

2. The minimum insertion depth of the thermocouple: should not be less than 8-10 times the outer diameter of its protective sheath (except for special products)

 

3. Insulation resistance: When the ambient air temperature is 15-35 °C and the relative humidity is <80%, the insulation resistance is 5 megohms (voltage 100V). Thermocouple with splash-proof junction box, when the relative temperature is 93±3, the insulation resistance is 0.5 megohm (voltage 100V).

4. High temperature insulation resistance: At high temperature, the insulation resistance (per meter) between the thermocouple hot electrode (including the double-branched type) and the protection tube and the double-branched hot electrode should be greater than the specified value. The following table.

 

Thermocouples are the most commonly used temperature sensors in scientific research and industrial production. Although its structure is simple, if it is not used carefully, it will still cause a large measurement error.

2022年5月28日 11:41
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