What are Temperature Transmitters & Their Advantages?

What Are Temperature Transmitters?

Temperature transmitters are devices which convert signals generated by a thermocouple or RTD into 4-20 mA output signals which are essential in appliances developed for taking temperature measurements remotely. Such transmitters have many advantages over conventional types of temperature measurement devices. 

Why Do More And More Industries Use Temperature Transmitters?

In some industrial processes, it is essential to monitor the real-time temperature changes of the system while sitting remotely due to safety reasons. Conventional thermocouples have a common limitation that they produce very low intensity signals. Such devices are required to be connected to a 2-wire transmitter in order to condition and amplify these signals to achieve better quality signals for more accurate temperature readings. These signals can then be easily transmitted using copper wires to other devices such as meters, chart recorders, computers, temperature controllers, and data loggers. 

How To Use A Temperature Transmitter?

A temperature transmitter should be connected to a DC power supply from which it will draw current in proportion to the inputs provided by the sensor. This change in the power supply is actually accounted for by the signal thus transmitted. While measuring the lowest temperature of the process, the input transmitter draws 4 mA of current from the DC supply source. As the temperature of the system rises, it will start drawing more current until the 20 mA mark is reached. The 20-mA mark signals the highest temperature that is sensed. The internal circuitry of the transmitter that conditions the signals defines the temperature range represented by the output current signals. 

What Are The Main Advantages of A Temperature Transmitter?

There are many advantages of using temperature transmitters for measuring temperature accurately over other traditional methods as below:

  • There is no requirement for AC power supply especially at the remote location in order to operate the 2-wire temperature transmitter. A temperature transmitter only requires minimum DC power of 4-20 mA output signals. Additionally, the 24 Vdc signal that is necessary to operate a temperature transmitter is widely accepted as a standard for plants equipped with heavy instrumentation. 
  • There are no problems of signal degradation or electrical noises for the operators using the temperature transmitters. A temperature transmitter’s signals are highly immune to ambient electrical noises. The receiving device usually eliminates any noise generated by the transmitters’ output current signal using common-mode rejection. In addition, the output current signal from the transmitter can travel long distances without much change contrary to most voltage signals. 
  • A temperature transmitter is extremely useful in lowering the wiring costs. The low intensity signals produced by the thermocouple essentially require a shielded cable to travel a significant distance. 

Heatcon – A Global Manufacturer of Top-Quality Temperature Transmitters and Temperature Sensors!

If you too have a process where you can find the use of a temperature transmitter necessary, you can query the experts at Heatcon – a leading global manufacturer of high-quality temperature sensing devices and industrial appliances for complete assistance in fulfilling all your process requirements.