Let’s start at the beginning. RTD means resistance temperature detector, and you’ll find these sensors used in many sectors to measure temperature. As the name suggests, it uses changes in resistance to detect temperature, but that in itself might not tell you how an RTD works. When the temperature increases, the RTD’s resistance increases, and vice versa.
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Vendors build RTD sensors out of a variety of materials. Platinum, copper, and nickel show up the most often, with platinum as the fan favorite because it offers the best stability in a wide range of temps.
You can choose RTDs with two, three, or four wires, but what does that mean? These wires create the compensation you need for the cable. Of course, the two-wire option doesn’t, so you should choose it when you need only an approximate value. The three-wire option is most common in many applications.
We have an article here at Visaya discussing RTDs and other types of temperature sensors. And on the right, you can explore the market with our device page.
This video will tell you more about RTDs:
To know more about how an RTD works and particular products, get in touch with our engineers!