Thin film RTD & Its Advantages

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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