The working principle of the integrated temperature transmitter

Working principle of the integrated temperature transmitter

integrated temperature transmitter is the thermocouple or heat resistance sensor measured temperature is converted into electrical signals, then send the signals to the input of the network in the transmitter, the network contains zero and thermocouple compensating circuit. After zero input signals to the operational amplifier for signal amplification, the amplification of a signal path V/I converter with 4 - after processing 20 ma dc current output; Another through A/D converter after processing to display meter.

there are two kinds of the linearization of the transmitter circuit, adopt feedback way. For thermal resistance sensors, use the way of positive feedback correction, the thermocouple sensor, with multiple line approximation method for correction. The integration of digital display temperature transmitter has two ways. LCD display of the temperature transmitter with two wire system output, the temperature of the LED display transmitter output in three wire system mode.