Temperature Transmitters: A Guide to choosing the correct Temperature Transmitter

How Do Temperature Transmitters Work?

Temperature transmitters work by taking the analog signal generated by a temperature sensor (emf for a thermocouple or resistance for an RTD) and converting it into a standardised output. A simplified explanation of the process is detailed below:

1. Signal Acquisition: The transmitter collects the voltage or resistance signal from the temperature sensor.

2. Signal Conditioning: It then processes and conditions the signal (e.g. cold junction compensation for thermocouples) to ensure accuracy and stability.

3. Output Signal Generation: The transmitter generates a standardised output signal, such as 4-20 mA, or 0-5Vdc which is proportionate to the temperature measurement. For example, the transmitter can be programmed to give a linearised 4-20mA output over a range of 0ºC to 100ºC where 4mA represents 0ºC and 20mA represents 100ºC.

4. Signal Transmission: This standardised output signal can then be transmitted over long distances (useful for thermocouple signals to eliminate volt drop errors) as part of a 2 wire loop to instrumentation, data loggers, temperature controllers or PLCs.

Applications for Temperature Transmitters

Temperature transmitters are used for various applications in a wide range of industries, including:

1. Industrial Processes: For precise temperature control and monitoring in manufacturing and chemical processes.

2. HVAC Systems: To monitor and regulate heating, ventilation, and air conditioning systems.

3. Scientific Research: In laboratories and scientific experiments.

4. Energy Management: In energy-efficient and cost-effective temperature control solutions.

5. Petrochemical / Oil and Gas: ATEX approved transmitters are available for a wide range of uses within the Oil and Gas Industry.

Summary

Temperature transmitters play a pivotal role in maintaining accurate temperature measurement and control in various industries. Their ability to convert sensor signals into standardised outputs, along with their many features and benefits, makes them an essential component in temperature management systems.

For more information on temperature transmitters, specific applications, or assistance in choosing the right transmitter for your application, please contact one of our experienced engineers on 01895 252222 or use the Live Chat button.