vastuslämpömittareiden

Vastuslämpömittarit, often referred to as resistance thermometers or resistance temperature detectors (RTDs), are devices used to measure temperature. They operate on the principle that the electrical resistance of certain metals changes predictably with temperature. As temperature increases, the resistance of these metals typically increases as well. This change in resistance is then measured and converted into a temperature reading.

The most common material used in resistance thermometers is platinum due to its excellent stability, accuracy, and wide temperature range. Other metals like copper and nickel can also be used, but they generally have a more limited temperature range or are susceptible to contamination. A typical resistance thermometer consists of a sensing element, usually a thin wire wound around a core or deposited as a film, enclosed within a protective sheath. This sheath protects the sensing element from the environment it is measuring.

The resistance of the sensing element is measured using an electrical circuit, often a Wheatstone bridge. The change in resistance is directly proportional to the temperature change. Resistance thermometers are known for their high accuracy and stability, making them suitable for precise temperature measurements in various industrial, scientific, and laboratory applications. They are commonly found in processes requiring strict temperature control, such as in food processing, chemical manufacturing, and metrology.