Resistance thermometers and thermocouples
Platinum resistance thermometers
- Platinum resistance thermometers are the most accurate sensors and have the best long-time stability
- Due to the chemical resistance of Platinum, the risk of impurity by oxidation and other chemical influences is reduced
- High consistency
Thermocouples
- Larger temperature range than resistance thermometers
- Small hot junction enables short response time
- More robust and resistant against mechanical stress
- Cheaper
General
A reliable temperature measurement requires a most exact adaption to the corresponding process. This statement is valid for thermocouples as well as for resistance thermometers.
| Characteristics | Resistance thermometers | Thermocouples |
|---|---|---|
| Dimensions | large sensor surface | small sensor surface possible |
| Response time | relatively long | short |
| Connection cables | copper cables | Thermo compensating cables |
| Accuracy | very good | good |
| Consistency | very good | satisfactory |
| Surface temperature measurement | not possible | possible |
| Hot junction | over the whole length of the RTD | punctual |
| Robustness | good | very good |
| Spontaneous heating | has to be considered | does not occur |
| Temperature range | up to +600°C | higher temperature possible |
| Cold junction | not necessary | necessary |
| Circuit supply | yes | no |
| Vibration resistance | relatively sensitive | very rugged |
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