The use of integrated temperature transmitter1

Integrated temperature transmitter is a kind of measuring instruments, generally by the temperature measuring probe ( The thermocouple or heat resistance sensor) And the two wire system solid electronic units. Integrated temperature transmitter has the measurement precision, the use of flexible, simple maintenance, long service life and so on to you, have a certain application in multiple areas.

in the form of solid module integrated temperature transmitter temperature measuring probe directly installed on the terminal box, thus forming the integration of the transducer. Integrated temperature transmitter with thermal resistance and thermocouple generally fall into two types.

heat resistance temperature transmitter is the RV conversion unit, linear circuit unit, the benchmark, reverse connect protection, current limiting protection, VI conversion unit, etc. Measuring temperature resistance signal amplification, and then by linear circuit of temperature compensate nonlinear relationship with the resistance, after VI conversion circuit outputs a measured a linear relationship with temperature and constant current signal of 4 ~ 20 ma.

thermocouple temperature transmitter generally by the reference source, cold junction compensation, amplification, linearization, VI conversion unit, broken accidentally processing, reverse connect protection, current limiting circuit protection units. It is the cold junction compensation of thermocouple thermoelectric potential enlarged, cap again by linear circuits eliminate the nonlinear error of thermoelectric potential and temperature, the final amplification into 4 ~ 20 ma current output signal. In order to prevent the thermocouple measurement by thermocouple wire break and make the temperature control failure caused by accident, transmitter will also include a power protection circuit. When the thermocouple wire break or pick up solution, transmitter will output the maximum value ( 28mA) In order to make the instrument to cut off the power supply.

integrated temperature transmitter has simple structure, saves the wire, big output signal, strong anti-interference ability, good linear, simple display instrument, solid module earthquake moisture-proof, reverse connection protection and current limiting protection, reliable work, etc.

the output of the integrated temperature transmitter for unification of 4 ~ 20 ma signal; Can be used with microcomputer system or other conventional instrument match. Can also be user requirements in explosion-proof type or fire type measuring instrument.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor