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

DAkkS Uncertainty of Measurement: Calibration at Temperature Fixed Points

 

Fixed point Temperature Uncertainty of
measurement Typ Au/Pt and Typ Pt/Pd		 Uncertainty of
measurement Noble metal thermocouples
Water 0,01 °C 200 mK 200 mk
Indium 156,5985 °C 200 mK 400 mK
Tin 231,928 °C 200 mK 400 mK
Zinc 419,527 °C 200 mK 500 mK
Aluminium 660,323 °C 200 mK 500 mK
Silver 961,78 °C 200 mK 600 mK

 

DAkkS Measurement Uncertainty: Comparison Calibration Gold/Platinum Thermocouples and Platinum-Palladium Thermocouples

 

Temperature
range		 Measuring conditions / procedure Smallest possible
uncertainty of
measurement		 Comments
0 °C to 962 °C in the calibration furnace
DKD-R 5-3:2018,
KA16-10-04:2017-10		 0,4 K Comparison with Au/Pt or
Pt/Pd thermocouples
962 °C to 1200 °C 1,5 K

 

DAkkS measurement uncertainty: comparison calibration of noble metal thermocouples (e. g. type R/S)

 

Temperature
range		 Measuring conditions /
procedure		 Smallest possible
uncertainty of
measurement		 Comments
-50 °C to 0 °C
in the calibration furnace or
liquid bath, DKD-R 5-3:2018,
KA16-10-04:2017-10		 0,4 K Comparison with standard
resistance thermometers
> 0 °C to 962 °C 0,8 K Comparison with Au/Pt or
Pt/Pd thermocouples
> 962 °C to 1200 °C 1,5 K

DAkkS Measurement Uncertainty: Comparison calibration of non-noble metal thermocouples
(e.g. type N)

 

Temperature
range		 Measuring conditions /
procedure		 Smallest possible
uncertainty of
measurement		 Comments
-196 °C In liquid nitrogen with calibration insert
DKD-R 5-1:2018		 1 K Comparison with standard
resistance thermometers
-80 °C to 0 °C Temperature control device
(e.g. liquid bath with balance block)
DKD-R 5-3:2010, KA16-10-04:2017-10		 1 K
0 °C to 962 °C 1,5 K Comparison with standard
thermocouples
> 962 °C to 1200 °C 2,5 K

 

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