Prefabricated thermocouple method to prevent outside interference1

Prefabricated thermocouple temperature measuring instrument is commonly used in industrial production, with the recorder and electronic regulator and other instruments, can be directly measured from 0 ℃ - in industrial production 1800 ℃ within the scope of the temperature of the steam, gas, liquid and solid surface. But in use, is always the moderating effect of external factors, which affect the measurement result, so how to prevent fabricated thermocouple resistance to interference?

1, the thermocouple reference ground. In the assembly of thermocouple ( Or compensation conductor) The output end, through a large enough capacity by electricity;

2, thermocouple measuring the grounding. From the assembly thermocouple measurement end a metal wire, directly grounded.

3, use the method of shielding, can make the leakage current through the metal shielding grounding directly, not into the measuring circuit, so as to eliminate the interference caused by the error of measurement;

4, the compensation of thermocouple wire laying within the iron pipe, iron pipe and ground, if the thermocouple compensation wire twisted together, effect is better;

5, the thermocouple dangling, make assembly thermocouple don't contact with the furnace wall brick, this kind of method used for vertical installation. If mounted horizontally, protecting tube is easy to deformation. Due to the thermocouple insertion hole enlargement, increase the heat loss, so the measurement error.

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