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

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of noble metal thermocouples at fixed points

The calibration of noble metal thermocouples is performed at ITS-90 temperature fixed points in the range from the water triple point to the silver freezing point, achieving excellent measurement uncertainties.

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Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of noble metal thermocouples at fixed points

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of a noble metal thermocouple (e.g., Type R and Type S) at the fixed points of the ITS-90.

Achievable DAkkS measurement uncertainties:

Calibration PointMeasurement Uncertainty
Water Triple Point 0.01 °C200 mK
Indium 156.5985 °C400 mK
Tin 231.927 °C400 mK
Zinc 419.527 °C500 mK
Aluminum 660.323 °C500 mK
Silver 961.78 °C600 mK

Additional calibration point (comparison method):

Calibration PointMeasurement Uncertainty
1200 °C1.5 K

Additionally, an inhomogeneity scan, including a graphical evaluation of the thermocouple, is performed.

The minimum immersion depth of the Standard Platinum Resistance Thermometer (SPRT) is 480 mm, and the maximum outer diameter is 8 mm.

Calibration duration: approximately 5 working days or as agreed.

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of gold/platinum thermocouples at fixed points

The calibration of gold/platinum thermocouples is performed at ITS-90 temperature fixed points in the range from the water triple point to the silver freezing point, achieving excellent measurement uncertainties.

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Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of gold/platinum thermocouples at fixed points.

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of a gold/platinum thermocouple at the fixed points of the ITS-90.

Achievable DAkkS measurement uncertainties:

Calibration PointMeasurement Uncertainty
Water Triple Point 0.01 °C200 mK
Indium 156.5985 °C200 mK
Tin 231.927 °C200 mK
Zinc 419.527 °C200 mK
Aluminum 660.323 °C200 mK
Silver 961.78 °C200 mK

Additionally, an inhomogeneity scan, including a graphical evaluation of the thermocouple, is performed.

The minimum immersion depth of the thermocouple is 480 mm, and the maximum outer diameter is 8 mm.

Calibration duration: approximately 5 working days or as agreed.

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of platinum/palladium thermocouples at fixed points

The calibration of platinum/palladium thermocouples is performed at ITS-90 temperature fixed points in the range from the water triple point to the silver freezing point, achieving excellent measurement uncertainties.

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Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of platinum/palladium thermocouples at fixed points.

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of a platinum/palladium thermocouple at the fixed points of the ITS-90.

Achievable DAkkS measurement uncertainties:

Calibration PointMeasurement Uncertainty
Water Triple Point 0.01 °C200 mK
Indium 156.5985 °C200 mK
Tin 231.927 °C200 mK
Zinc 419.527 °C200 mK
Aluminum 660.323 °C200 mK
Silver 961.78 °C200 mK

Additionally, an inhomogeneity scan, including a graphical evaluation of the thermocouple, is performed.

The minimum immersion depth of the thermocouple is 480 mm, and the maximum outer diameter is 8 mm.

Calibration duration: approximately 5 working days or as agreed.

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of noble metal thermocouples, e.g., Type R or S

Thermocouples in the temperature range from -50 °C to 1200 °C are calibrated using the comparison method with platinum/palladium thermocouples (Pt/Pd) or gold/platinum thermocouples (Au/Pt) as the reference standard.

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Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of noble metal thermocouples.

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of Type S or Type R thermocouples.

Comparison calibration against platinum/gold or platinum/palladium thermocouples.

DAkkS measurement uncertainty:

Temperature RangeMeasurement Uncertainty
from -50 °C to 0 °C400 mK
from 0 °C to 962 °C800 mK
from 962 °C to 1200 °C1500 mK

Additionally, an inhomogeneity scan, including a graphical evaluation of the thermocouple, is performed.

The minimum immersion depth of the thermocouple is 300 mm, and the maximum outer diameter is 8 mm.
The achievable measurement uncertainties depend on the test specimen.

Calibration duration: approximately 5 working days or as agreed.

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of gold/platinum or platinum/palladium thermocouples

Thermocouples in the temperature range from 0 °C to 1200 °C are calibrated using the comparison method with platinum/palladium thermocouples (Pt/Pd) or gold/platinum thermocouples (Au/Pt) as the reference standard.

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DAkkS Au/Pt or Pt/Pd (Comparison)

Accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS) of Au/Pt or Pt/Pd thermocouples.

Comparison calibration against platinum/gold or platinum/palladium thermocouples.

DAkkS measurement uncertainty:

Temperature RangeMeasurement Uncertainty
0 °C to 962 °C400 mK
962 °C to 1200 °C1500 mK

The minimum immersion depth of the thermocouple is 300 mm, and the maximum outer diameter is 8 mm.

The achievable measurement uncertainties depend on the test specimen.

Calibration duration: approximately 5 working days or as agreed.

Please specify the desired calibration points in your request.

Accredited comparison calibration according to DIN EN ISO/IEC 17025 (DAkkS) of non-noble metal thermocouples, e.g., Type N

Comparison calibration of non-noble metal thermocouples against reference thermocouples.

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Accredited calibration according to DIN EN ISO/IEC 17025 of non-noble metal thermocouples.

Comparison calibration against reference thermocouples.

DAkkS measurement uncertainty:

Temperature RangeMeasurement UncertaintyCalibration Method
-196 °C
1.0 KNitrogen Boiling Point
-180 °C to -80 °C1.0 KNitrogen Cryostat
-80 °C to 0 °C1.0 KCalibration Bath
0 °C to 961 °C1.5 K
Calibration Furnace
961 °C to 1200 °C2.5 K

The minimum immersion depth of the thermometer is 190 mm (at -196 °C: 300 mm).
The maximum outer diameter is 8 mm.
The achievable measurement uncertainties depend on the test specimen.

Calibration duration: approximately 5 working days or as agreed.

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 rangeProcedureUncertainty of measurement
0,01 °CDKD-R 5-1:2018 Water triple point0,2 K
156,5985 °CDKD-R 5-1:2018 Indium melting point0,2 K
231,928 °CDKD-R 5-1:2018 Tin melting point0,2 K
419,527 °CDKD-R 5-1:2018 Zinc melting point0,2 K
660,323 °CDKD-R 5-1:2018 Aluminium melting point0,2 K
961,78 °CDKD-R 5-1:2018 Silver freezing point0,2 K
0 °C to 962 °CDKD-R 5-1:2018 in the calibration furnace0,4 K
> 962 °C to 1200 °CDKD-R 5-1:2018 in the calibration furnace0,7 K
Calibration at temperature fixed points. Comparison with Au/Pt- or Pt/Pd-thermocouples.
Temperature rangeProcedureUncertainty of measurement
0 °C to 962 °CDKD-R 5-1:2018 in the calibration furnace0,4 K
> 962 °C to 1200 °CDKD-R 5-1:2018 in the calibration furnace0,7 K
Comparison with Au/Pt- or Pt/Pd-thermocouples.

Noble metal thermocouples

Temperature rangeProcedureUncertainty of measurement
0,01 °CDKD-R 5-1:2018 Water triple point0,2 K
156,5985 °CDKD-R 5-1:2018 Indium melting point0,4 K
231,928 °CDKD-R 5-1:2018 Tin melting point0,4 K
419,527 °CDKD-R 5-1:2018 Zinc melting point0,5 K
660,323 °CDKD-R 5-1:2018 Aluminium melting point0,5 K
961,78 °CDKD-R 5-1:2018 Silver freezing point0,6 K
Calibration at temperature fixed points.
Temperature rangeProcedureUncertainty of measurement
-50 °C to 0°CDKD-R 5-1:2018 in calibration furnace or liquid bath0,4 K ¹
0 °C to 962 °CDKD-R 5-1:2018 in calibration furnace or liquid bath0,8 K ²
> 962 °C to 1200 °CDKD-R 5-1:2018 in calibration furnace or liquid bath1,5 K ²
¹ Comparison with standard resistance thermometers.
² Comparison with Au/Pt- or Pt-/Pd-thermocouples.

Base-metal thermocouples

Temperature rangeProcedureUncertainty of measurement
-196 °CDKD-R 5-1:2018 in liquid nitrogen with compensation block1,0 K ¹
-180 °C to -80 °CDKD-R 5-1:2018 in cryostat1,0 K ¹
-80 °C to 230 °CDKD-R 5–3:2018 in calibration furnace or liquid bath1,0 K ¹
0 °C to 962 °CDKD-R 5–3:2018 in calibration furnace or liquid bath 1,5 K ²
> 962 °C to 1200 °CDKD-R 5–3:2018 in calibration furnace or liquid bath 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.

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