Calibration temperature scale

Calibration

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

 

Contact us for more information

We use cookies to keep statistics on the traffic at the website in order to ensure that the content is relevant and easy to locate. You can always delete cookies from senmatic.com Read More

Close