RTD temperature transmitter is the instrumentation for temperature measurement and control in modern industrial sites and research institutes. Resistance thermistor temperature transmitter is also a necessary product for centralized system and digital bus system.
Like in the power plant temperature measurement system, a large part of the design using RTD temperature transmitter, RTD temperature transmitter will be converted into temperature signal 4 ~ 20mA DC current signal, and then sent to the secondary instrumentation or other data acquisition system for temperature data display. RTD temperature transmitter has the advantages of simple structure, large output signal, strong anti-interference ability, good linearity, convenient display instrumentation, reverse connection protection and current limit protection.
The RTD in RTD temperature transmitter is a commonly used temperature measuring element in the middle and low temperature area. Resistance thermistor uses the material in the temperature change, its own resistance also changes with the characteristics, to measure the temperature. When the measured medium has a temperature gradient exists, the measured temperature sensing element in the range of the average temperature in the media layer. It is characterized by high measurement accuracy and stable performance. Among them, the platinum RTD has the highest measurement accuracy.
The role of the amplification unit of the temperature transmitter is to amplify the millivolt signal output from the range unit for voltage and power amplification, and output a unified DC current signal or DC voltage signal. Eventually, the temperature transmitter converts the temperature signal into a unified standard signal, which is provided to the indication, recorder or regulator, etc. to realize the display, recording or automatic control of temperature parameters.
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