The temperature transmitter adopts thermocouple and thermal resistance as the temperature measuring element, and the output signal from the temperature measuring element is sent to the transmitter module, after filtering, arithmetic amplification, nonlinear correction, V/I conversion, constant current and reverse After the protection circuit is processed, it is converted into a 4-20mA current signal output that is linear with the temperature. Â
Temperature transmitter technology has been very mature, temperature transmitters are often used with some instruments, and there are often some minor faults during the matching process. The more common faults and solutions are as follows.
First, the transmitter output does not change when the measured medium temperature rises or falls. This is mostly a problem with the temperature transmitter seal. It may be due to the temperature transmitter not sealing or being inadvertently welded. The sensor is soldered with a small hole. This situation generally requires the replacement of the transmitter housing.
Second, the output signal is not stable. This is the reason for the temperature source. The temperature source is an unstable temperature. If the meter display is unstable, it is the reason why the instrument's anti-interference ability is not strong.
Third, the output error of the transmitter is large. The reason for this is more. It may be that the resistance wire of the selected temperature transmitter does not cause the range error, and there may be no calibration when the transmitter is shipped.
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The temperature transmitter converts a physical measurement signal or an ordinary electrical signal into a standard electrical signal output or a device capable of outputting as a communication protocol. The temperature transmitter is a meter that converts a temperature variable to a standard output signal that can be transmitted, and is mainly used for measuring and controlling temperature parameters of an industrial process. The current transmitter converts the AC current of the main circuit under test into a constant-current loop standard signal, which is continuously sent to the receiving device.
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