lämpömittausvastuksesta

Lämpömittausvastus, commonly known as a resistance temperature detector (RTD), is a type of temperature sensor. It works by measuring the change in electrical resistance of a metal wire as its temperature changes. As the temperature of the RTD increases, its electrical resistance also increases. Conversely, as the temperature decreases, the resistance decreases. This predictable relationship between resistance and temperature allows for accurate temperature measurement.

The most common material used for RTDs is platinum, due to its stability and linearity over a wide temperature range. Other materials like nickel and copper are also used in specific applications. RTDs typically consist of a fine wire coil or a thin film deposited onto a ceramic substrate. This sensing element is then protected by a sheath, often made of stainless steel, to shield it from the environment.

To measure the temperature, an electric current is passed through the RTD, and its resistance is measured. This resistance value is then converted into a temperature reading using a calibration curve or a standard resistance-temperature relationship. RTDs are known for their high accuracy and long-term stability, making them suitable for demanding industrial and scientific applications. They are widely used in process control, laboratory equipment, and HVAC systems.