- In order to make the thermocouple thermal response time is comparable, the national standard provides: thermal response time should be carried out in a special water flow test device. The device should maintain the water flow rate of 0.4 ± 0.05m / s, the initial temperature in the range of 5-45 ℃, the temperature jump value of 40-50 ℃. In the test process, the water temperature change should not be greater than the temperature jump value of ± 1%. The depth of insertion of the test thermocouple is 150mm or the designed insertion depth.
- Because the thermocouple at room temperature near the thermal potential is very small, the thermal response time is not easy to measure, so the national standard can be used with the same specifications of the K-type thermocouple thermal electrode assembly to replace its own thermal electrode assembly, and then carry out the test.
- The test should be recorded thermocouple output change to the equivalent of a step change in temperature 50% of the time T0.5, if necessary, can be recorded as a change of 10% of the thermal response time T0.1 and 90% of the change in the thermal response time T0.9. The recorded thermal response time, should be the same test At least three times the average of the results of the test, the results of each measurement for the average value of the deviation should be within ± 10%. In addition, the time required to develop a step change in temperature shall not exceed one-tenth of the T0.5 of the thermocouple under test. The response time of the recording instrument or meter shall not exceed one-tenth of the T0.5 of the thermocouple under test.
How To Measure Type K Thermocouple Thermal Response Time
Dec 02, 2024
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