#WishIknew What is an RTD?

Temperature

When you have a question about process automation that needs a short answer, let us know with #WishIknew and #Visaya! We’ll reply with a #WishIknew post. It’ll give a quick explanation, then some related articles, videos, and reviews if you want to know more.

I wish I knew what is an RTD!

For starters, RTD means resistance temperature detector, and you can use it to measure temperature in your process. The control system or transmitter constantly sends a current through the RTD sensor. When the temperature changes, the resistance on the current will increase or decrease, and the RTD will detect this shift and report it.

Many factors can change the properties of an RTD. Various materials, such as platinum, copper, or nickel, can affect the range and linearity. Element types can have effects too, like thin-film elements or wire-wound elements. You can also have sensors with two, three, or four wires. The most common version is three, but each option has its pros and cons.

If you want more details, check out these posts:

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Temperature measurement and control systems! – Today, you have tons of ways to connect your instrumentation to your control system, but as always, all the options have good points and bad. With an application where you have to connect temperature sensors to your system, which option(s) will work best for you?