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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