The integration principle of type selection of thermocouple1

The integration of thermocouple by temperature measuring probe (commonly The thermocouple or heat resistance sensor) And the two wire system solid electronic units. In the form of solid module temperature measuring probe directly installed on the terminal box, thus forming integration thermocouple integrated thermocouple temperature transmitter is the RV conversion unit, linear circuit unit, the benchmark, reverse connect protection, current limiting protection, VI conversion unit, etc. After the integration of temperature measuring thermocouple signal amplification, and then by linear circuit of temperature compensation for the nonlinear relationship of the, after VI conversion circuit outputs a measured a linear relationship with temperature and constant current signal of 4 ~ 20 ma.

the temperature transmitter by the reference source, cold junction compensation, amplifier, linearization, VI conversion unit, broken accidentally processing, reverse connect protection, explosion-proof thermocouple, current limiting protection circuit unit. 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.

integration thermocouple has simple structure, saves the wire, big output signal, strong anti-jamming capability, good linear, simple display instrument, solid module earthquake moisture-proof, reverse connection protection and current limiting protection, reliable work, etc.

the integration of the output of the thermocouple 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.

SBW series temperature transmitter module for 24 v power supply, the integration of two wire thermocouple, explosion-proof thermocouple. Products using imported IC, amplify the signal of thermocouple, translates into 4 - 20 ma output current, or 0 ~ 5 v output voltage. One armoured transmitter can directly measure the temperature of the gas or liquid is particularly suited to low temperature range measurement, overcome the condensed water on the effects of temperature measurement.

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