Thermocouple measuring precision improvement measures1

Thermocouple is a kind of measuring instrument is known to all, has been widely applied in industrial, medical, petroleum, metallurgy, construction and other industries. Thermocouple is mainly measuring tool if the thermocouple measurement is accurate, the accuracy is not high for users is has a great influence. So what is the method to improve precision of? Engineering today is for everybody to introduce the method of enhancing thermocouple accuracy.

first talk about thermocouple accuracy level:

1: s degree has a first-class standard thermocouple and second-class standard thermocouple, it is mainly used for scale of transfer and measuring the testing standard, especially expensive. Prices in the 8000 - meter long 20000! Industrial-grade of grade I 【 1 + [ t- 1100] X0003】 And class II plus or minus 025% t

2: B dividing class II plus or minus 025% t, level III plus or minus 05% t

3: k dividing grade I t, plus or minus 04% percentage points of class II plus or minus 075% t

for more precision grade in terms of what we strengthen? Suggest to do the following:

1: when the design according to the needs of the reasonable selection.

2: using high precision thermocouple.

3: choosing the right degree when choosing thermocouple, what what kind of thermocouple temperature range selection, choose the corresponding index.

4: using high-precision display instrument.

5: the site to do a good job of screening, reduce the interference.

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