Thin film RTD & Its Advantages

Last Updated on June 28, 2022 by Electricalvolt

A thin film RTD has a small platinum film on a ceramic substrate. Platinum is the most widely used element for the resistance temperature detector(RTD). The main feature of the thin film RTD is that it has a very linear resistance Vs temperature relationship. The excellent linearity in the change in the resistance with temperate thin-film RTD makes it a good choice for precision temperature measurement.

Thin film RTD & Its Advantages

The thin-film RTD can reliably function in the range from -200°C up to +850°C. The thin-film RTD is available as a leaded device and surface mount device. Further, It can also be constructed for working temperatures above 850°C. It is also available in the resistance value 100Ω, 500Ω, and 1,000Ω.

Advantages of Thin Film RTD

The followings are the advantages of thin-film RTD.

  • It needs a very less material for its construction. Therefore, it is cost-effective.
  • The small size of the thin film RTD makes it a perfect choice as a temperature sensor for most instrumentation and industrial control applications.
  • It is easy to get increased resistance with the reduced size of thin-film RTD. Therefore, it is possible to get the RTD in different resistance, such as 100Ω, 500Ω, and 1,000Ω.
  • The sensitivity of the sensor also increases because of an increase in nominal resistance.
  • The leads of the thin film RTD are suitable for connecting to the instruments through soldering, crimping, brazing, and welding. Thus, it is easy to interface RTD to the instrument.
  • The thin-film RTD is available in different resistance ranges. Therefore, it is possible to have a wide range of temperature measurements.
  • It has a wide temperature range of measurement.
  • The repeatability of the thin film RTD is excellent, and it provides accurate temperature measurement without drift.
  • Thin-film RTD is very robust and does not affect by vibration. Thus, a thin film RTD is the best choice for a vibration environment.
  • The response time of the thin film RTD is excellent, and its resistance changes very quickly with changes in temperature.
  • It is cheaper than the wire wound RTD.

Looking to the above good features of thin-film RTD, it is the best temperature sensor that fits for almost all temperature measurement applications. The thin-film RTD has wide applications in automobiles, medical thermometers, and, process plant instrumentation.

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About Satyadeo Vyas

Satyadeo Vyas, M.Tech,M.B.A. is an electrical engineer and has more than 36 years of industrial experience in the operation, maintenance, and commissioning of electrical and instrumentation projects. He has good knowledge of electrical, electronics, and instrumentation engineering.

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