In the process of using the K type thermocouple will find the response time of K type thermocouple for the whole measurement process is very important, so the response time of the K type thermocouple should be how to measure? The K type thermocouple is measured by the project to introduce method of response time.

K type thermocouple measurement precision, wide measurement range. Because of thermocouple direct contact with the object being measured, not affected by intermediate medium.


K type thermocouple simple structure, easy to use. Thermocouple is usually composed of two different kinds of metal wire, but is not limited by the size and the beginning of, outside has protective casing, which are very convenient.


K type thermocouple measurement of the thermal response time is actually more complex, different test conditions will produce different measurement result, this is due to the effect of heat transfer rate of surrounding medium, heat transfer rate is high, the thermal response time is short.


in order to make the thermocouple comparable thermal response time, national standards: thermal response time should be in the special flow test device. Of flow velocity in the device should keep 04-005 ms, the initial temperature of 5 ℃ - Temperature 45 ℃, within the scope of the step value of 40 ℃ - 50℃。 In the process of test, the water temperature should be no greater than temperature step value plus or minus 1%. The subjects of the thermocouple placement depth of 150 mm in depth or design.


in the thermocouple thermoelectric potential near room temperature is very small, thermal response time is not easy to measure, so can use the same specification of national standard of the K type thermocouple electrode component to replace its own hot electrode components, and then tested.


test should record the change of the thermocouple output to the equivalent of 50% of the time temperature step change T05, when necessary record 90% 10% of the thermal response time T01 and changes of T09 thermal response time.


the thermal response time, recorded should be the same test at least three times the average of the test results, each measurement results for the average deviation should be within + / - 10%.


in addition, the time needed for forming temperature step change should not exceed one hundred percent of the test thermocouple T05. Record the ring should be time of instrument or instrument should not exceed one hundred percent of the participants thermocouple T05.





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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor