K type thermocouple thermal response time

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. The device of flow speed should be zero. 4±0. At 5 ℃ - 05 ms, the initial temperature 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 step change of temperature T0 50% of the time. 5, if necessary, can record changes 10% T0 thermal response time. 90% of the thermal response time T0 1 and change. 9.

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 be tested more than thermocouple T0. One over ten of the five. Recording instrument or instrument of the ring should be time should not be more than the participants thermocouple T0. One over ten of the five.

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