Introduction and working principle of integrated explosion proof thermal resistance
2021-03-16 17:34
The integrated explosion-proof thermal resistance is usually used with display instrument, recording instrument, electronic computer, etc., with output of 4 ~ 20mA. The surface temperature of liquid, vapor, gas medium and solid in the range of 0 ~ 1800 ℃ in various production processes is directly measured.
The output of integrated explosion-proof thermistor is a unified 4 ~ 20mA signal; It can be used with microcomputer system or other conventional instruments. It can also be made into explosion-proof or fire-proof measuring instrument with temperature transmitter according to user's requirements. Thermal resistance is also called integrated explosion-proof thermal resistance. Integrated explosion-proof thermal resistance refers to installing amplification and transmission module (i.e. temperature transmitter) in waterproof or explosion-proof junction box of thermal resistance to form integration with sensor, Output standard 4-20mA current signal or 0-5V or 1-5V voltage signal. It is usually used together with display instrument, recording instrument and electronic computer to directly measure the surface temperature of liquid, steam, gas medium and solid in the range of 0-500 ℃ in various production processes. The temperature transmitter is generally composed of reference source, cold end compensation, amplification unit, linearization processing, V / I conversion, disconnection processing, reverse connection protection, current limiting protection and other circuit units. The resistance produced by thermal resistance is compensated and amplified by cold end, and then the nonlinear error between resistance and temperature is eliminated by linear circuit. Finally, it is amplified and converted into 4 ~ 20mA current output signal. In order to prevent the failure of temperature control caused by broken wire in thermal resistance measurement, the transmitter is also equipped with a power-off protection circuit. When the thermal resistance is broken or poorly connected, the transmitter will output the maximum value (28ma) to cut off the power supply of the instrument. The temperature transmitter module is a 24 V power supply, two-wire or three wire integrated thermal resistor. The product adopts imported integrated circuit to amplify the signal of thermal resistance and convert it into 4-20mA output current or 0-5V output voltage. The armored transmitter can directly measure the temperature of gas or liquid, especially in the low temperature range, which overcomes the influence of condensate on temperature measurement
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