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Temperature Elements Thermocouples / RTD Assembles:


RESISTANCE TEMPERATURE DETECTOR (RTD)

  • It employs high purity electrical resistance wire, non inductively wound on ceramic or glass base.
  • When RTD element is subjected to heat, it changes its electrical resistance value, corresponding to variation in temperature and its thermal coefficient (8) (Alpha).
  • The temperature resistance characteristics have an established pattern for different resistance elements, like Copper, Nickel, Platinum etc.
  • Most commonly used resistance element in Platinum known as Pt 100 (100 ohms at 0°C) Temperature resistance characteristics conform to DIN 43760/ IEC 751 / BSS 1904/ JIS C 1604 standards.

Temperature°C Tolerance
IEC 751:1983 (BS 1904:1984, DIN3760:1980)
Class A Class B
±°C ±0hms ±°C ±°0hms
-200 0.55 0.24 1.3 0.56
-100 0.35 0.14 0.8 0.32
0 0.15 0.06 0.3 0.12
100 0.35 0.13 0.8 0.30
200 0.55 0.20 1.3 0.48
300 0.75 0.27 1.8 0.64
400 0.95 0.33 2.3 0.79
500 1.15 0.38 2.8 0.93
600 1.35 0.43 3.3 1.06
650 1.45 0.46 3.6 1.13
700 -- -- 3.8 1.17
800 -- -- 4.3 1.28
850 -- -- 4.6 1.34


TYPICAL CONNECTION SCHEMATICS FOR 2, 3 & 4 WIRE LEAD
CONFIGURATION FOR RESISTANCE THERMOMETER DETECTORS



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