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Analysis of leakage causes of thermocouple

2022-02-26 15:18:28
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As we all know thermocouple is a measurement instrument, is widely used in industry, medical, oil, gold, construction and other professions. Thermocouple is the first thing to measure things, if the measurement of thermocouple is not accurate, precision is not high, thermocouple leakage and so on for the user is a great influence. So why does a thermocouple leak? Today we will introduce the reasons for thermocouple leakage.

Reasons for thermocouple leakage:

(1) The firebrick on the electric furnace has poor insulation at high temperature. The thermocouple with metal tube inserted into the wall of the furnace wire is easy to make the furnace wire contact with the thermocouple. Firebrick is an outstanding insulating material at room temperature.

Most of the lining of resistive electric furnace is made of alumina refractory brick, whose resistance value decreases significantly with the increase of temperature.

(2) furnace wire and thermocouple contact, platinum-rhodium thermocouple maintenance tube is alumina porcelain tube, couple wire with porcelain tube for separation insulation, at high temperature insulation function will also decline, the formation of leakage leakage to the thermocouple, so that there are AC leakage signals on the thermocouple.

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Treatment method of leakage on thermocouple:

(1) Keep thermocouple out of contact with firebrick.

(2) the negative pole of the thermocouple is grounded to eliminate the leakage signal on the thermocouple.

(3) Filter device is installed at the output end of thermocouple.

(4) from the hot contact of the thermocouple lead ground grounding.

As chemical, petroleum, metallurgy, machinery and other parts of the rapid development of high precision, high sensitivity, appearance is widely used, liquid level meter appearance anti-interference problem become shall not neglect the problem, especially in industrial electric furnace, silicon carbide furnace, salt bath furnace, etc. The interference of big, form looks not work properly, error increases, unstable and instructions at a slower pace, and so on. It is necessary to be processed, otherwise the quality of products can not be guaranteed, the formation of loss.

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Company: Zhejiang Chunhui Instrument Co., LTD

Address: 101 Mingyue Road, Shangyu District, Shaoxing City, Zhejiang Province