What is a RTD?

Resistance temperature detectors are widely used equipment for measuring the temperature of process fluids (liquids and gases) in chemical plants and the like. As a basic principle, the temperature is measured using the characteristic that the resistance value changes when the temperature of the metal changes. Thermocouples also come to mind as a device for measuring temperature, but resistance thermometers have less measurement error than thermocouples and are particularly accurate at low temperatures. often used for Also, if a protective tube is used, it can be used for a wide variety of fluids, so it is widely used for temperature measurement in chemical plants.

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