Industriell integrerad temperatursensor Teknisk referens

The integrated temperature sensor for industrial use is composed of electronic units such as thermocouples, thermal resistors, and bimetallic thermometers. The temperature transmitter module is connected to the temperature sensor probes such as thermocouples and thermal resistors and the temperature transmitter module is installed in the junction box to form an integrated temperature sensor. The integrated temperature sensor is generally divided I tre typer: termiska motstånd, termoelement och bimetalliska termometrar .
The integrated temperature sensor is composed of a reference unit, an R/V conversion unit, a linear circuit, reverse connection protection, current limiting protection, and a V/I conversion unit. After the temperature measuring thermal resistor signal is converted and amplified, the linear circuit compensates for the nonlinear relationship between temperature and resistance, and outputs a 4-20mA constant current signal that is linearly related to the uppmätt temperatur efter V/I -omvandlingskretsen .
Temperatursändaren består i allmänhet av kretsenheter såsom en referenskälla, kall slutkompensation, amplifieringsenhet, lineariseringsbehandling, v/I -omvandling, frånkopplingsbehandling, omvänd anslutningsskydd och nuvarande begränsande skydd . Det är att amplifiera den termoelektriska potentialen som genereras av termo -kopplingen genom det kalla änden och sedan användningen av den linjekretsen till den termoelektriska potentialen som genereras av det termo -kopplade koppling temperature, and finally amplify it and convert it into a 4-20mA current output signal. In order to avoid accidents caused by temperature control failure due to thermocouple wire breakage during thermocouple measurement, the transmitter is also equipped with a power-off protection circuit. When the thermocouple wire is broken or the connection is poor, the transmitter will output the maximum value (28mA) För att klippa av instrumentets strömförsörjning .