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Resistance Temperature Detectors (RTDs) are temperature sensors based on the resistance of an electronic material to temperature changes that affects the signal used for measurement. They are widely utilized in a variety of applications due to their extremely precise and repeatable readings. RTDs are also commonly used in conjunction with thermocouples and other measurement devices to determine temperature trends or to protect systems from dangerous overheating.

The use of a RTD is derived from the fact that when the resistance of an electronic material changes, this effect can be detected and measured. As the temperature changes, the resistance value of the RTD will vary appropriately, and this variance can be monitored and detected. The most common type of RTD is constructed from a thin film of material ranging from two to 10 ohms, and the most popular material is platinum.

The working principle for an RTD is fairly straightforward. As a voltage is applied across the RTD, the current will flow through the conductor depending on its resistance value. This means that the current can be used to determine the temperature of the conductor and the environment. The amount of resistance depends on the properties of the material, which means that they are extremely accurate when measuring temperatures over a wide range.

RTDs are widely used in many different industries and applications due to their high accuracy and reliable readings. They are most commonly used in medical and industrial temperature monitoring, process control, and even in automotive systems. RTDs are also a popular choice for applications involving extreme temperatures, as they can accurately measure temperatures from -200C to +1000C.

In general, RTDs offer a wide range of advantages and benefits, including: precise measurements, reliable readings, wide temperature measurement range, and flexibility. Furthermore, they are also relatively inexpensive and durable, making them an ideal choice for many different applications.

All in all, RTDs are widely used in a variety of industries and applications due to their precise, reliable, and accurate readings. They are often used as a reliable temperature measurement source in medical and industrial applications. Furthermore, they are relatively inexpensive and durable, making them an ideal choice for many different applications.