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Traceable to ITS-90 and EN60751
- Calibration is needed for high accuracy or for verification to third party.
- Calibration of RTD sensors
1. The sensors are compared at -195 °C, -75 °C, 0 °C and 100 °C with traceable references.
2. A certificate with measurements, calculated Calendar Van-Dusen coefficients, uncertainty and traceability is issued.
- Unique calibration
Senmatic offer a unique calibrated 4-20 mA transmitter – RTD sensor set.
- What does unique calibration mean?
1. The RTD sensor is calibrated
2. The transmitter is programmed with the Callendar Van-Dusen coefficients
3. The transmitter is calibrated by simulating the RTD resistance at 3 points (4 mA, 12 mA and 20 mA)
4. Certificates for both calibrations are supplied together with the paired transmitter-sensor set
- Callendar Van-Dusen coefficients?
The resistance at temperature t can be described this way R(t) = Ro*( 1 + A*t + B*t2 + C*(t-100)*t3) where Ro is the resistance at 0 °C and A, B and C the Calendar Van-Dusen coefficients. Above 0 °C C=0. By active use of the coefficients the sensors uncertainty is less than ±0.024 °C in the calibrated range.
- Calibration is only offered with 4 wire sensors