-- Process Parameters talk about platinum resistance thermometers which have become available. They point out how PRTDs are slowly becoming the normal replacement for thermocouples, at least in the majority of lower-temperature industrial applications.
Platinum RTDs (resistance temperature detector) have a resistance of 100 ohms at zero, which changes with the temperature and these types of temperature sensor are most suited for applications that have a temperature range of between -200°C to 600°C. These temperature sensors are reliable and can offer a higher degree of accuracy.
With most RTDs, there are no special extension cables needed or even cold junctions that are required when using a typical thermocouple. The use of platinum is used because of how stable it is when working with temperatures. One of the main downsides is that the detection wire needs to be kept completely free of contamination in order to stay stable.
Resistance thermometers only need a small current to pass through it in order to accurately determine the resistance. This feature can cause self-heating and manufacturers limits should be considered and followed. Users should also take care to avoid any strain on the RTD within their application.
RTD or thermocouple? Thermocouples are made with two dissimilar metals or conductors where a temperature difference between the hot and cold junctions (join) of the thermocouple generates a small voltage signal which changes with temperature. They are best suited to elevated temperatures (up to 1700°C) or very low temperatures (down to -200°C) and are also ideal where there is any vibration. If you need a fast response temperature sensor we recommend the use of thermocouples.
Process Parameters Ltd are a UK based manufacturer who specialise in industrial temperature sensors. This includes but is not limited to: Thermocouples, Platinum RTDs and Thermistor sensors.
This means Process Parameters know exactly what they are talking about when it comes to temperature and what the best way to measure it is. They have a wealth of experience and manufacture all products to suit their customers’ designs.
For more information about Process Parameters or to see their range of products available for customers who require industrial process equipment, see the following link: https://www.processparameters.co.uk/
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