RTD stands for Resistance Temperature Detector that refers to a type of temperature sensor. As the name suggests, it uses changes in resistance to detect temperature, but that in itself might not tell you how an RTD works.

How does an RTD work?

When the temperature increases, the RTD’s resistance increases, and vice versa. The control system or transmitter constantly sends a current through the RTD sensor. When the temperature changes, the resistance on the current can increase or decrease.  Here, the RTD detects this shift and thereby reports it.

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ACT20M-RTI-AO-S Signal converter/ insulator for RTD 
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To know more about this, you can check out the Visaya Product Review

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.

Also, we 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 we should choose it when you need only an approximate value. The three-wire option is most common in many applications.

 

To know more about the difference betwwwn RTD and Thermocouple, you can read the Visaya Article on RTD vs Thermocouple 

RTD sensor types

Many factors influence the properties of an RTD sensor. 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. We can also have sensors with two, three, or four wires. The most common version is three, but each option has its pros and cons.

To know more about tenperature sensor types, you can read the Visaya Article on Temperature Sensors

To know more about RTD sensors, you can check this video below or can get in touch with our engineers!

 

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