What is the advantage of thermocouple and bimetallic thermometer? Release date: 2019 03 - 14 reading times: zero

Thermocouple and bimetallic thermometer between the two is very close, just at the time of measurement temperature, bimetallic thermometer is suitable for use in the detection of low temperature state of the scene, in the process of measurement can measure the gas medium of minus eighty degrees Celsius to five hundred degrees Celsius temperature and the temperature of the liquid vapor, mostly used in high temperature industrial thermocouple, while in low temperature environment is the use of bimetallic thermometer is reasonable, the main components and bimetallic thermometer is made up of one or more pieces of metal to overlap the multilayer metal plates, using their swelling degrees of different in different temperature as a principle of work, when one end is after thermal expansion occurs, pointer will be driven to rotate, the instrument will show on the corresponding temperature value. The thermocouple is in the low temperature area one of the most commonly used temperature detector. Its main characteristic is high measurement accuracy, stable performance. The platinum thermal resistance measurement accuracy is the highest, it not only widely used in industrial temperature measurement, and is made into standard benchmark instrument. Metal thermal resistance of thermal components have quartz sleeve cross frame structure, twist the skeleton structure have to bar type structure, etc. Thermal resistance is the temperature transform into a resistance value transform element, usually need to resistance signal through wire transfer to the computer control device or other instrument on at a time. Industrial heat resistance at the scene of the production installation, and there is a certain distance between control room, so the heat resistance of the wire will have larger influence the measurement result. Thermocouple leakage prevention method 1, keep the thermocouple is not in contact with the refractory brick. 2, the thermocouple negative ground, eliminate the leakage on the thermocouple signal. 3, adding filtering devices on the thermocouple output end. 4, from the hot junction thermocouple leads to earth ground. 5, on the thermocouple tube and jacket heat-resistant steel pipe or carborundum tube, and make it grounded.