A temperature transmitter converts the thermocouple or RTD signal to a 4-20 mA output signal and is the ideal solution for many remote temperature measurement applications. 4-20ma transmitters have definite advantages over conventional temperature measuring devices, but must be selected with caution in order to avoid “ground loop” problems.
Thermocouple
- AC power is not required at the remote location in order to operate a two-wire transmitter
- The supply of additional power at the remote location is not needed, as transmitters are powered by a low level 4 – 20 mA output current signal. Additionally, the usual 24 Vdc signal necessary for operation is standard in plants that have increased amounts of instrumentation.
- Electrical noise and signal degradation are not a problem for two-wire transmitter users
- When it comes to ambient electrical noise, the transmitter’s current output signal lends itself to a high immunity. Any noise that does appear in the output current is usually prevented by the common-mode rejection of the receiving device. In addition, the current output signal will not diminish (change) with distance as can be seen in most voltage signals.
- Wire costs decrease significantly when using transmitters
Used in many Industries to transmit temperature in 4-20 mA signal from remote Temperature Sensor to PLC or any other control system.
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