Platinum Resistance Thermometers and Their Application throughout Industries

Process specialist Process Parameters Ltd today spoke out about platinum resistance thermometers and cover their application in critical industries as well as everyday industry.

Process Parameters spoke to us today about platinum resistance thermometers and about what they are along with their application within the industry.

In a nutshell, a platinum resistance thermometer is a piece of wire (platinum of course) that determines the temperature through the measurement of its electrical resistance (think of the Seeback effect). The devices themselves are referred to as temperature sensors and need to be manufactured carefully to ensure the device offers a perfect combination of sensitivity, range, and reproducibility.

Platinum resistance thermometers have been around for a long time, as early as 1890 when the first resistance thermometer was successfully developed by Professor H. L. Callendar and pushed into production. In the modern age, though, their uses are incredible. For example, in a modern passenger aircraft you can potentially find up to fourteen resistance thermometers – these are required to measure the temperatures of the oil, the fuel, the cabin air, the outside air, and even more. Arguably, base metal thermocouples could also be used in this application to measure such temperatures but thermocouples are hindered by the necessity of a reference temperature to operate. Platinum resistance thermometers fitted with stainless steel sheaths and used in conjunction with ratio-meter indicators are therefore preferred. In power stations resistance thermometers are used, generally with Wheatstone bridges and multi-point indicators, to measure steam, gas, and water temperatures.

Within a power station setting, resistance thermometers are also used in order to measure the gas, water and steam temperatures. They are used in the storage, processing, and transport of food, storage of fruit in carbon-dioxide, they are within dock-side grain silos and any cargo ship that has any form of refrigeration and in fact, some cargo ships that carry refrigerated meat or fruit may have nearly a hundred platinum resistance thermometers throughout. Finally, they are also applied within the chemical industry and are considered to be one of the largest users of these resistance thermometers for precise lab measurements.

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