32207594

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A resistance temperature detector (RTD) is a type of temperature sensor. RTDs are most commonly used in industrial applications due to their accuracy and reliability. The RTD is an electrical resistance which varies linearly with temperature. RTDs measure temperatures ranging from -200°C to 850°C. The RTD has a long history of use in temperature sensing applications but more recently has taken a back seat to thermocouples as the go-to temperature measurement device of choice.

The basic principle of operation of RTDs is the use of a material that changes its electrical resistance in a predictable manner with changing temperature. The electrical resistance of most RTD elements is nearly linear over a range of temperatures; however, it is often necessary to use temperature measuring ranges beyond the linear range. This is achieved using a resistance measurement bridge circuit.

The 32207594 RTD is an example of a platinum-based resistance thermometer, which offers excellent temperature measurement accuracy of better than 0.15 °C. It is used widely in industrial applications, from temperature and flow, to pressure, voltage, strain, and other measurements. The sensor is made of pure platinum, formed into a coil on ceramic beads, covered in a protective carbon coating and attached to heat-resistant insulation. All of these parts are housed in a stainless steel shell, which provides a hermetic seal. The shell is then filled with an oxygen-free compound, such as silicone oil, to help protect the sensor from mechanical vibrations and shock.

At the heart of the RTD is a Wheatstone bridge circuit, which is used to measure the resistance of the material. The bridge consists of four resistors, one of which is the RTD element. When the RTD element is exposed to varying temperatures, the resistance of the element changes, allowing the bridge circuit to output a voltage proportional to the temperature. This voltage can then be further used to calculate an accurate temperature measurement. The resistance of the RTD is affected by the surrounding environment and must be compensated in order to be accurate.

The 32207594 RTD boasts an accuracy of better than 0.15°C and a temperature range of -200°C to 850°C. It is highly durable and resistant to vibration and shock due to its encapsulation in stainless steel and silicone oil. Additionally, its bridge circuit allows for precise temperature measurement beyond the linear range. The 32207594 RTD is an excellent choice for industrial applications which require a reliable, accurate temperature measurement device.

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