RTD Full Form – Meaning and Definition

Have you come to this blog for RTD full form or any other type of information related to RTD. If yes then this article is for  you. In today’s article we will tell you what is RTD? What is the full form of RTD. Where it is used, how RTD works, from which material it is made. Why platinum is used in RTD? And how many types are there?

Friends, if you study electrician in ITI, then you must have heard about the word RTD once or twice.

Apart from this, even if you work in a big company or industry, you must have heard about RTD. If you have come to this article, then you must have definitely needed information about RTD.

You will know the full form of RTD and what is the meaning of it?

Let us tell you that RTD is the most advanced type of thermocouple device i.e. it is also advance than thermocouple.

Right now, as the industries and factories are becoming modern, RTD devices are used instead of thermocouples.

For your information, let us tell you that the design of the thermocouple is such that it measures the temperature in milli volts. In the chamber of this device the yellow wire represents positive and red wire represents negative.

Thermocouple works on the principle of Seebeck effect. Let us tell you that Seebeck is one of the three effects under the thermoelectric effect.

What is RTD( RTD Full Form)?

RTD is a kind of instrument which is also called Resistance Thermometer. It is a temperature sensor and this device is often used to measure the temperature in industries and factories.

The resistance of TRD also increases with increase in temperature and the output of temperature is also obtained in resistance and it works on Positive Temperature Coefficient (PTC).

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Talking about the structure of RTD, there are elements of RTD at its lower end.

To support these elements, there is a lead support in the middle. These elements can be made of platinum, nickel, copper and tungsten metals.

It has a special sheath on the side that protects the RTD from overheating. After this there is a Mounting Thread on one side on its head which is useful to hang it somewhere.

There are 2, 3 or 4 connecting leads coming out of the head of the RTD. The accuracy of the temperature is determined by the number of connecting leads, meaning the more the lead, the more accurate the temperature will be.

RTD Full Form

In RTD full form, R stands for Resistance, T stands for Temperature and D stands for Full Form Detector. In this way the full form of RTD is Resistance Temperature Detector in English.

RTD full form
Resistance Temperature Detector

Its full form in Hindi means ‘resistance temperature indicator’.

R – Resistance

T – Temperature

D – Detector

Types of RTD

There are many types of RTD which we are telling you  today. We divide Resistance Temperature Detector into two categories, first on the basis of connection and second on the basis of wire.

In the first category of connection, we also get to see two sub-category, first is RTD simplex and second is duplex.

Now there are three types of RTD in the second category i.e. wire, first two wire, second 3 wire and 3rd 4 wire RTD. Get to know all of them one by one below.

Simplex RTD

In which the output syrup of temperature is sent to the same place, it is known as Simplex RTD. It has a maximum of 3 wires.

Duplex RTD

Duplex RTD is primarily used in the pharmaceuticals, textiles, chemical and food industries.

The Duplex RTD is used where the signal has to be sent to 2 locations, for example distributed control system (DCS) or Programmable Logic Controller (PLC) and another is sent to the location indicator where the temperature is observed. .

Also Read  TRLM Full Form

What is Two Wire RTD?

As its name suggests, it has two wires. This RTD is used for short distances like 3 to 4 meters. If the distance is greater than this, the accuracy of the temperature decreases.

3 (Three) Wire RTD

Let us tell you that as the length of the wires increases in RTD. The own resistance of the wires also gets added to the output, due to which the measurement of temperature comes more.

There are three wires in three wire RTD and the third wire which reduces or eliminates the resistance arising from the longer length of the wire, so that the temperature output is accurate.

Which metal is used in RTD?

Four metals are used in Resistance Temperature Detector which are Platinum, Nickel, Copper, Tungsten. RTDs made of platinum wire come in the name of PT100 and PT1000.


Platinum wire is used in PT100 as it gives stable and accurate results. Platinum provides excellent repeatability and is capable of providing sufficiently large resistance chains per degree change.


The PT1000 is used on top of the PT100 sensor in two wired applications. This is because the PT 1000 sensor makes the resistance of the lead less important.

What is the accuracy of RTD?

RTD is more accurate than thermocouple. It works more accurately in the lower temperature range and has an accuracy of 0.1 to 1℃.

What is the response time of RTD?

The response time of RTD is fast, it responds in 0.5 seconds to 5 seconds.

Conclusion – RTD Full Form

By reading this article, you came to know what is RTD, what is full form of RTD. With this you learned about the metal used in RTD and what is the temperature range of Resistance temperature detector.

You must have also known the working principal of RTD and how many types of RTD are there. Hope you understand this article about RTD. If you have any question then you can ask by commenting.

Thank you.

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