Thermocouple input. $r $n isolated two-wire system, 4-20mA output. $r $n has an output signal zero point and a full-scale potentiometer. $r $n high-precision conversion, linearization correction. The unified external structure of $r $n has a small volume and light weight. A transmitter with sensors usually consists of two parts: the sensor and the signal converter. Sensors are mainly thermocouples or thermistors; The signal converter is mainly composed of a measurement unit, a signal processing unit, and a conversion unit (due to the standardization of industrial thermal resistance and thermocouple calibration tables, the signal converter is also called a transmitter when it is an independent product)