The working principle and features of digital integrated temperature transmitter1

Digital integrated temperature transmitter is accurate measuring temperature and then to digital display so called digital integrated temperature transmitter. Users in the use of digital integrated temperature transmitter needs to have certain knowledge of digital integrated temperature transmitter, the working principle and characteristics is the user must understand the knowledge, the following projects to introduce specific digital display for everyone working principle and characteristics of the integrated temperature transmitter.

digital integrated temperature transmitter working principle:

the thermocouple or heat resistance sensor measured temperature will be 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, after amplification of a signal path VI converter calculation with 4-20 ma dc current output; After another through the AD converter 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.

display the characteristics of the integrated temperature transmitter:

adopt silicon rubber, or epoxy resin sealing structure, so the seismic, moisture resistance, suitable for installation at the scene of the harsh environment.

, on-site installation in the terminal box use of thermocouple, heat resistance, 4 - direct output 20mA、0- 10 ma, the output of the signal. Such already save expensive compensation conductor, and improve the anti-interference ability in the process of signal transmission over a long distance;

, thermocouple transmitter has cold end temperature automatic compensation function;

high precision, low power consumption, use of wide temperature range, stable and reliable work;

, wide applicable scope, can form integrated installation structure with thermocouple, heat resistance, can also be used as a functional modules installed on the testing equipment and instrument panel use;

by HART modem intelligent temperature transmitter and PC communication or handheld device and PC to the transmitter model, index number, the range of remote information management, configuration, variables, monitoring, calibration and maintenance functions;

intelligent temperature transmitter can be adjusted according to the user's actual needs, according to direction of the transducer, and display the measured medium temperature transmitter, the sensor values change, the output current and percentage rate;

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