Use of temperature transmitters

Use of temperature transmitters  

In order to create a temperature measurement system, an electronic temperature measuring device must be connected to the control system. The RTD and thermocouple can be connected directly to the I/O card of the control system or through a temperature transducer for signal conversion. In most applications, a temperature transmitter is used to convert the RTD / thermocouple signal and transmit the 4-20 mA signal, rather than connecting the RTD or thermocouple directly to the I/O card

Choosing to use a temperature sensor over directly connecting an RTD or thermocouple to the control system provides many advantages:

Signals generated by a resistance temperature detector or thermocouple are categorized as a low-level signal and are therefore more susceptible to noise compared to a conventional 4-20mA signal generated by a transmitter.

Reduce the device cable type. It also means less type for a replacement cable.

The junction box for temperature sensor cables can be combined with cables from other 4-20 mA sensors.

There is no need to provide a special I/O card for the thermocouple/RTD. Just connect the transmitter to the analog input I/O card.

It provides a maintenance facility such as a diagnostic function in a smart transmitter.