Choose the thermocouple issue to consider1

Thermocouple, is commonly used in temperature measuring instrument of temperature measuring element. In the process of measurement, thermocouple due to the influence of different factors, and the measurement result is affected. So in order to avoid the occurrence of error, when choosing a thermocouple, the following five factors need to be taken into account.

1, the index number: thermocouple different indexing number corresponding to the different temperature, to ensure the accuracy of temperature measurement, you need to understand and grasp the meaning of different index number represents.

2, the thermal response time: general situation to thermal response time is the sooner the better, but due to the thermocouple protection tube manufacture craft and the thermocouple leads to thermal response delay. But this problem can be resolved, it needs to be noted in the choose and buy of you.

3, the type of installation: this is very important during installation, when you choose to use a thermocouple, want to know any existing device at the scene of the your work, if there is must be provided, the manufacturer will according to your device on the thermocouple welding corresponding device at the scene.

4, thermocouple sheath material or chemical corrosion resistance: a variety of reasons will put the thermocouple directly in the material and temperature measurement, and the corrosive material is very strong, so in this case, you must show, general thermocouple protection tube corrosion resistance is poor, cannot use ordinary casing to strong corrosive medium. It will greatly reduce the service life of the thermocouple.

5, resistance to wear and tear or vibration resistance: it is very important, some of the enterprise, industrial and mining conditions is poor, the higher the temperature of the cement industry in some places, and has a liquidity object scour thermocouple, so his demands for thermocouple is higher, and need to be able to wear resistance and good aseismic capacity.

through the above understanding, I believe you had certain understanding to choose thermocouple. In addition, also need to be aware of the common error of the thermocouple, in order to avoid these errors affect the accuracy of the measurement results.

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