How to choose a temperature sensor?

How to choose a temperature sensor?

Temperature is a very critical parameter that must be controlled in industrial production. It has a direct impact on the quality of industrial products, equipment and personal safety. The selection of temperature detection instruments should not blindly require high measurement accuracy, wide range, and high degree of automation, but should combine various factors such as the specific process in industrial production, the reality of the measured medium, and the economy. The principle to be followed is that the upper and lower limits of the measured temperature of the detection instrument should be greater than the fluctuation range of the measured medium temperature, the measurement accuracy meets the technical requirements of the production process, the use mode meets the observation needs of the measurement personnel, and it is convenient for daily maintenance and maintenance work, and on this basis,choose the most economical and affordable detection instrument.

 According to measurement range requirements

The temperature of the medium to be measured is a very critical basis for choosing a suitable measuring instrument. If you are measuring room temperature, you can choose thermocouple thermometers, thermal resistance thermometers, pressure gauges, and bimetal thermometers.

1.The characteristic of the organic liquid glass thermometer is that its indicator liquid is red, which is good for reading, but it cannot charge the contact. Therefore, when measuring the medium whose temperature is lower than 100℃ and does not need to send a signal, the organic liquid glass thermometer can be preferred. The main advantage of the bimetal thermometer is its clear scale, vibration resistance and mercury-free, so when the temperature of the measured medium is lower than 300℃, it is best to choose a bimetal thermometer.

2. If the stability of the measured medium is lower than 150℃, you can choose a copper thermal resistance; if the temperature of the measured medium is within the range of 300℃ to 600℃, you can choose a nickel-chromium-copper thermocouple, 3. However, because the copper alloy wire is easily oxidized, it is best to choose a nickel-chromium-nickel-silicon thermocouple when it is used to measure the steam temperature of more than 500℃.

4. If the temperature of the measured medium is between 600°C and 1000°C, you can choose a nickel-chromium-nickel-silicon thermocouple

5. If the temperature of the measured medium is between 1000°C and 1300°C, platinum rhodium-platinum thermocouple should be selected.

6. If the temperature of the measured medium is very high, you can choose a radiation pyrometer or an infrared pyrometer.