Temperature transmitter is a kind of converting temperature variables can transmit the standardization of the output signal of the instrument. It is mainly used for industrial process measurement and control of the temperature parameters.

With sensor transmitter usually consists of two parts: sensor and signal converters. The sensor is mainly the thermocouple or heat resistance; Signal converter mainly consists of measurement unit, signal processing and conversion unit (due to the thermal resistance and thermocouple indexing table used in industry are standardized, so the signal converter as a separate product is called the transmitter), some transmitter increases the display unit, some also have the function of field bus. Transmitter if is composed of two sensors used to measure the temperature difference, the output signal and the temperature difference between a given continuous function relationship. So called temperature transmitter.

Transmitter output signal with a given continuous function relation between temperature (usually in the form of linear function), early production of the transmitter of the output signal and the temperature sensor resistance (or voltage) between a linear function relation.

The output signal of standardization is 0 ma ~ 10 ma ma and 4 ~ 20 ma (or 1 v to 5 v) dc signal. Do not rule out other standardized output signal with special provisions.

Temperature transmitter according to the power supply connection mode can be divided into two wire system and four wire system.

Transmitter has electric unit combination instrument series (DDZ - Ⅱ type, the DDZ - Ⅲ type and model DDZ - S) and miniaturization modular, multi-functional intelligent. The former are without sensor, after two types of transducer can be convenient and thermoelectric walk or heat resistance transmitter with a sensor.