Calibration of thermocouples

 

DAkkS Calibration of Thermocouples

 

Calibration by the comparison method or at fixed temperature points

Thermocouples are calibrated at ITS-90 temperature fixed points in the range from the water triple point to the silver freezing point with excellent measurement uncertainties. Alternatively, thermocouples in the temperature range from -196 °C to 1200 °C can also be calibrated by the comparison method (DKD-R 5-3 “Calibration of thermocouples by the comparison method”) using platinum/palladium thermocouples (Pt/Pd) or gold/platinum thermocouples (Au/Pt) as standards.

  • Gold/platinum thermocouples and platinum/palladium thermocouples as calibration standard
  • Use of state-of-the-art temperature fixed points up to the silver fixed point (961,78 °C)
  • Water triple points as thermocouple cold junctions
  • Customised calibration inserts from own production
  • DAkkS calibration certificate from -196 °C to 1200 °C
  • Temperature probes can be calibrated from a length of 190 mm
  • Temperature probes and indicator

 

 

 

Calibration of non-noble metal thermocouples

  • By using a variety of calibration furnaces, small immersion depths from 190mm are possible
  • Calibration above 0°C reference junction also possible with mini-plugs
  • DAkkS calibration certificate from -196 °C to 1200 °C
  • DKD-R 5-3 “Calibration of thermocouples according to the reference method”.

Calibration of noble metal thermocouples

  • DAkkS calibration certificate from -50 °C to 1200 °C
  • Calibration at ITS-90 fixed points or alternatively as comparison calibration according to DKD-R 5-3 “Calibration of thermocouples by the comparison method”.
  • Calibration in a 3 zone furnace with very good homogeneity

New: Inhomogeneity scan

For DAkkS calibrations of thermocouples, an inhomogeneity scan is also done.  A moving heat source tests the entire thermometer material for local inhomogeneities. The inhomogeneity scanner is an in-house development by Klasmeier. It can be used to calibrate thermocouples more precisely:

  • more realistic analysis of the measurement uncertainties
  • verification of the thermal treatment 
  • exact statement about the homogeneity of the thermocouples

Uncertainty of measurement during DAkkS calibration

Thermocouples type Au/Pt and type Pt/Pd

Temperature range Procedure Uncertainty of measurement
0,01 °C DKD-R 5-1:2018 Water triple point 0,2 K
156,5985 °C DKD-R 5-1:2018 Indium melting point 0,2 K
231,928 °C DKD-R 5-1:2018 Tin melting point 0,2 K
419,527 °C DKD-R 5-1:2018 Zinc melting point 0,2 K
660,323 °C DKD-R 5-1:2018 Aluminium melting point 0,2 K
961,78 °C DKD-R 5-1:2018 Silver freezing point 0,2 K
0 °C to 962 °C DKD-R 5-1:2018 in the calibration furnace 0,4 K
> 962 °C to 1200 °C 0,7 K

Calibration at temperature fixed points. Comparison with Au/Pt- or Pt/Pd-thermocouples.

 

Temperature range Procedure Uncertainty of measurement
0 °C to 962 °C DKD-R 5-1:2018 in the calibration furnace 0,4 K
> 962 °C to 1200 °C 0,7 K

Comparison with Au/Pt- or Pt/Pd-thermocouples.

 

 

Noble metal thermocouples

Temperature range Procedure Uncertainty of measurement
0,01 °C DKD-R 5-1:2018 Water triple point 0,2 K
156,5985 °C DKD-R 5-1:2018 Indium melting point 0,4 K
231,928 °C DKD-R 5-1:2018 Tin melting point 0,4 K
419,527 °C DKD-R 5-1:2018 Zinc melting point 0,5 K
660,323 °C DKD-R 5-1:2018 Aluminium melting point 0,5 K
961,78 °C DKD-R 5-1:2018 Silver freezing point 0,6 K

Calibration at temperature fixed points.

 

Temperature range Procedure Uncertainty of measurement
-50 °C to 0°C DKD-R 5-1:2018 in calibration furnace or liquid bath 0,4 K ¹
0 °C to 962 °C 0,8 K ²
> 962 °C to 1200 °C 1,5 K ²

¹ Comparison with standard resistance thermometers.

² Comparison with Au/Pt- or Pt-/Pd-thermocouples.

 

Base-metal thermocouples

Temperature range Procedure Uncertainty of measurement
-196 °C DKD-R 5-1:2018 in liquid nitrogen with compensation block 1,0 K ¹
-180 °C to -80 °C DKD-R 5-1:2018 in cryostat 1,0 K ¹
-80 °C to 230 °C DKD-R 5–3:2018 in calibration furnace or liquid bath 1,0 K ¹
 0 °C to 962 °C  1,5 K ²
 > 962 °C to 1200 °C  2,5 K ²

¹ Comparison with standard resistance thermometers.

² Comparison with standard thermocouples.

 

New digital archive Klasmeier Cloud:
Calibration documents quickly and easily available

The new Klasmeier Cloud – the perfect archive for all calibration documents. From now on, our customers will find a QR code on all devices calibrated by Klasmeier, with which they can quickly and easily access our digital archive. Especially useful: In addition to all calibration documents, the contact details of the relevant contact person at Klasmeier are also always available there. So even five or more years from now, if you have any questions about your calibration product, you can find the information you need with just one click.

 

Zur Klasmeier Cloud

 

 

 

 

Questions about calibration?

Contact: Boris Kalb – b.kalb@klasmeier.com