resistance temperature detector (RTD)

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resistance temperature detector (RTD)

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resistance temperature detector (RTD)

  1. 1. PROLIFIC RTD 11/09/13 1
  2. 2. BASIC CONCEPT  RESISTENCE OF ANY METAL CHANGES WITH ITS TEMPERATURE CHANGE.  RTDs ARE POSITIVE TEMPERATURE COEFFICIENT DEVICES i.e. THEIR EFFECTIVE RESISTENCE INCREASES WITH THE INCREASE IN TEMPERATURE 11/09/13 2
  3. 3. Pt 100 RESISTANCE VALUE AT 0 DEGREE CELCIUS ITS RESISTANCE IS 100 OHMS 11/09/13 3
  4. 4. TEMPERATURE RANGE  - 200 degree Celsius to 850 degree Celsius 11/09/13 4
  5. 5. ACCURACY +/- 0.3 OHM at 100 degrees CELCIUS 11/09/13 5
  6. 6. Resistance Temperature Detectors / RTD / RTDs  Resistance Temperature Detectors (RTD) are sensors used to measure temperature by correlating the resistance of the RTD element with temperature. Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is usually quite fragile, so it is often placed inside a sheathed probe to protect it. The RTD element is made from a pure material whose resistance at various temperatures has been documented. The material has a predictable change in resistance as the temperature changes; it is this predictable change that is used to determine temperature 11/09/13 6
  7. 7.  The RTD is one of the most accurate temperature sensors. Not only does it provide good accuracy, it also provides excellent stability and repeatability.   RTDs are also relatively immune to electrical noise and therefore well suited for temperature measurement in industrial environments, especially around motors, generators and other high voltage equipment. 11/09/13 7
  8. 8. Common Resistance Materials for RTDs :  Platinum (most popular and accurate)  Nickel  Copper  Balco (rare)  Tungsten (rare ` ` 11/09/13 8
  9. 9. TYPICAL DESIGN 11/09/13 9
  10. 10. RTD ELEMENT The RTD element is the simplest form of RTD. It consists of a piece of wire wrapped around a ceramic or glass core. Because of their compact size, RTD elements are commonly used when space is very limited. 11/09/13 10
  11. 11. A surface element is a special type of RTD element. It is designed to be as thin as possible thus providing good contact for temperature measurement of flat surfaces. 11/09/13 11
  12. 12. RTD Probes  The RTD probe is the most rugged form of RTD. A probe consists of an RTD element mounted inside a metal tube, also known as a sheath. The sheath protects the element from the environment. 11/09/13 12
  13. 13. RTD PROBE 11/09/13 13
  14. 14. 11/09/13 14
  15. 15. PROBE (Thermowell) 11/09/13 15

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