The composition of thermocouple temperature transmitter and power supply connection method1

Thermocouple 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 industrial heat resistance and thermocouple indexing table is standardized, so signal converter as a separate product is called the transmitter) And some transmitter increases the display unit, some also have the function of field bus. Principle of thermocouple temperature transmitter 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) , the early production of the transmitter of the output signal and the temperature sensor resistance ( Or voltage value) A linear function relationship between.

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

thermocouple 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 - , the DDZ - Ⅱ type And the DDZ - Ⅲ type S) And miniaturization modular, multi-functional intelligent. The former were without sensor, after two kind of transmitter can easily with the thermocouple or heat resistance transmitter with a sensor.

thermocouple and bimetallic thermometer compare what are the advantages of each?

thermocouple and bimetallic thermometer between the two is very close, just at the time of measurement temperature, bimetallic thermometer is suitable for use in the detection of low temperature state of the scene, in the process of measurement can measure the gas medium of minus eighty degrees Celsius to five hundred degrees Celsius temperature and the temperature of the liquid vapor, mostly used in high temperature industrial thermocouple, while in low temperature environment is the use of bimetallic thermometer is reasonable, the main components and bimetallic thermometer is made up of one or more pieces of metal to overlap the multilayer metal plates, using their swelling degrees of different in different temperature as a principle of work, when one end is after thermal expansion occurs, pointer will be driven to rotate, the instrument will show on the corresponding temperature value.

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