{"id":3190,"date":"2024-04-18T20:35:28","date_gmt":"2024-04-18T18:35:28","guid":{"rendered":"https:\/\/www.klasmeier.com\/thermometerkalibrierung-bei-niedrigen-temperaturen\/"},"modified":"2025-05-07T11:29:01","modified_gmt":"2025-05-07T09:29:01","slug":"thermometerkalibrierung-bei-niedrigen-temperaturen","status":"publish","type":"page","link":"https:\/\/www.klasmeier.com\/en\/thermometerkalibrierung-bei-niedrigen-temperaturen\/","title":{"rendered":"Thermometer calibration at low temperatures"},"content":{"rendered":"\n
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DAkkS calibration of thermometers at low temperatures<\/strong><\/h3>\n\n\n\n

Do you want to calibrate thermometers at extremely low temperatures? But the temperature range of the calibration baths and standardised procedures used is not sufficient for you? Then you’ve come to the right place. We use boiling nitrogen to extend the temperature range.<\/p>\n\n\n\n

With the three calibration procedures shown here, you can have thermometers calibrated by us DAkkS in the temperature range from -180 \u00b0C to -80 \u00b0C<\/strong> and at the fixed temperatures of -189 \u00b0C and <\/strong>
-196 \u00b0C<\/strong>.<\/p>\n<\/div>\n\n\n\n

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Calibration at low temperatures
Overview of our DAkkS calibration services<\/strong><\/h2>\n\n\n\n
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Ar<\/mark><\/strong><\/h3>\n\n\n\n

-189 \u00b0C<\/h3>\n\n\n\n

ITS-90 calibration
down to the triple point
of argon<\/strong><\/p>\n\n\n\n

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Request calibration<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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LN2<\/sub><\/strong><\/mark><\/strong><\/h3>\n\n\n\n

-196 \u00b0C<\/h3>\n\n\n\n

Thermometer calibration with
liquid nitrogen<\/strong> as reference temperature<\/p>\n\n\n\n

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Request calibration<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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<\/i><\/mark><\/strong><\/h4>\n\n\n\n

-180 \u00b0C to -80 \u00b0C<\/h3>\n\n\n\n

Thermometer calibration with
freely selectable calibration points<\/strong> in the nitrogen cryostat<\/p>\n\n\n\n

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Request calibration<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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With the boiling nitrogen we can:<\/strong><\/strong><\/h3>\n\n\n\n

<\/i><\/mark> Calibrate thermocouples and resistance thermometers with freely selectable calibration temperatures between -180 \u00b0C and -80 \u00b0C in the DAkkS nitrogen cryostat.<\/strong>
<\/i><\/mark> Use the boiling point of nitrogen and calibrate thermometers at -196 \u00b0C DAkkS.<\/strong>
<\/i><\/mark> put the argon triple point into operation at -189.3442 \u00b0C and carry out a complete ITS-90 DAkkS calibration in the temperature range from -189 \u00b0C to 0 \u00b0C.
The fixed points used are:<\/strong><\/p>\n\n\n\n

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<\/i><\/mark> Argon triple point -189,3442 \u00b0C<\/strong>
<\/i><\/mark> Mercury triple point -38,8344 \u00b0C<\/strong>
<\/i><\/mark> Water triple point 0,01 \u00b0C<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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Accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of SPRTs at temperature fixed points (SPRT, Pt 25, Pt 2.5, Pt 0.25)<\/strong><\/strong><\/p>\n<\/div>\n<\/div>\n\n\n\n

The accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of ITS-90 Standard Platinum Resistance Thermometers (SPRT) is performed at ITS-90 fixed points.<\/p>\n\n\n\n

learn more<\/summary>\n

Accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of a Standard Platinum Resistance Thermometer (SPRT) (WGa = 1.11807 or WHg = 0.844235) at the fixed points (freezing points, melting points, and triple points) of the ITS-90. Achievable DAkkS measurement uncertainties, including the ITS-90 deviation function (k=2):<\/span><\/p>\n\n\n\n

Temperature Fixed Point<\/span><\/strong><\/td>in \u00b0C<\/strong><\/span><\/td>Measurement Uncertainty<\/strong><\/span><\/td><\/tr>
Argon Triple Point<\/span><\/td>-189.3442 \u00b0C<\/span><\/td>5.5 mK<\/span><\/td><\/tr>
Mercury Triple Point<\/span><\/td>-38.8344 \u00b0C<\/span><\/td>3.5 mK<\/span><\/td><\/tr>
Water Triple Point<\/span><\/td>0.01 \u00b0C<\/span><\/td>2.5 mK<\/span><\/td><\/tr>
Gallium Melting Point<\/span><\/td>29.7646 \u00b0C<\/span><\/td>2.5 mK<\/span><\/td><\/tr>
Indium Freezing Point<\/span><\/td>156.5985 \u00b0C<\/span><\/td>5.5 mK<\/span><\/td><\/tr>
Tin Freezing Point<\/span><\/td>231.928 \u00b0C<\/span><\/td>4.5 mK<\/span><\/td><\/tr>
Zinc Freezing Point<\/span><\/td>419.527 \u00b0C<\/span><\/td>4.5 mK<\/span><\/td><\/tr>
Aluminum Freezing Point<\/span><\/td>660.323 \u00b0C<\/span><\/td>7.0 mK<\/span><\/td><\/tr>
Silver Freezing Point<\/span><\/td>961.78 \u00b0C<\/span><\/td>12 mK<\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The fixed points are selected according to the temperature ranges of the ITS-90. The temperature ranges of the ITS-90 are as follows:<\/span><\/p>\n\n\n\n

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Before calibration, the Standard Platinum Resistance Thermometer (SPRT) is sufficiently aged. Hydrostatic pressure effects that occur in the fixed-point cells are corrected. The self-heating of the Standard Platinum Resistance Thermometer (SPRT) is examined before the calibration begins and is taken into account when presenting the calibration results. The calibration results include the resistance and W-values of the Standard Platinum Resistance Thermometer (SPRT), as well as two calibration curves (coefficients) calculated according to ITS-90 (with measurement currents of 0 mA and 1 mA unless otherwise specified).<\/span><\/p>\n\n\n\n

The calibration in the range from Argon (-189 \u00b0C) to the Water Triple Point (0.01 \u00b0C) additionally includes the specification of a measurement uncertainty for extrapolation according to EURAMET TG 01:2017 (up to the Nitrogen Boiling Point, ~196 \u00b0C) with a measurement uncertainty of 7 mK (k=2).<\/span><\/p>\n\n\n\n

The minimum immersion depth<\/strong> of the Standard Platinum Resistance Thermometer (SPRT) is:<\/span><\/p>\n\n\n\n

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<\/i><\/mark> at<\/span> -189 \u00b0C: 400 mm<\/span><\/strong><\/p>\n\n\n\n

<\/i><\/mark> at 962 \u00b0C: 450 mm<\/strong> <\/p>\n\n\n\n

<\/i><\/mark> in range -38 \u00b0C to 660 \u00b0C: 300 mm<\/strong><\/p>\n<\/div>\n\n\n\n

The maximum outer diameter<\/strong> is 8 mm<\/strong>.<\/span><\/p>\n\n\n\n

Calibration duration: approximately 5-7 working days or as agreed.<\/span><\/p>\n<\/details>\n\n\n\n

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request calibration<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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<\/i><\/mark><\/p>\n<\/div>\n\n\n\n

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Accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of a resistance thermometer at temperature fixed points (PRT, Pt 100, Pt 1000)<\/strong><\/strong><\/p>\n<\/div>\n<\/div>\n\n\n\n

The accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of resistance thermometers (Pt100, Pt1000) is performed at ITS-90 fixed points.<\/p>\n\n\n\n

learn more<\/summary>\n

Accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of a resistance thermometer at the fixed points (melting points & triple points) of the ITS-90. Achievable DAkkS measurement uncertainties, including the ITS-90 deviation function (k=2):<\/span><\/p>\n\n\n\n

Temperature Fixed Point<\/span><\/strong><\/td>in \u00b0C<\/strong><\/span><\/td>Measurement Uncertainty<\/strong><\/span><\/td><\/tr>
Argon Triple Point<\/span><\/td>-189.3442 \u00b0C<\/span><\/td>10 mK<\/span><\/td><\/tr>
Mercury Triple Point<\/span><\/td>-38.8344 \u00b0C<\/span><\/td>3.5 mK<\/span><\/td><\/tr>
Water Triple Point<\/span><\/td>0.01 \u00b0C<\/span><\/td>2.5 mK<\/span><\/td><\/tr>
Gallium Melting Point<\/span><\/td>29.7646 \u00b0C<\/span><\/td>2.5 mK<\/span><\/td><\/tr>
Indium Freezing Point<\/span><\/td>156.5985 \u00b0C<\/span><\/td>5.5 mK<\/span><\/td><\/tr>
Tin Freezing Point<\/span><\/td>231.928 \u00b0C<\/span><\/td>7.0 mK<\/span><\/td><\/tr>
Zinc Freezing Point<\/span><\/td>419.527 \u00b0C<\/span><\/td>12 mK<\/span><\/td><\/tr>
Aluminum Freezing Point<\/span><\/td>660.323 \u00b0C<\/span><\/td>20 mK<\/span><\/td><\/tr><\/tbody><\/table>
The achievable measurement uncertainties depend on the test specimen. <\/figcaption><\/figure>\n\n\n\n

The fixed points are selected according to the temperature ranges of the ITS-90. The temperature ranges of the ITS-90 are as follows:<\/span><\/p>\n\n\n\n

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Before calibration, the resistance thermometer is sufficiently aged. Hydrostatic pressure effects occurring in the fixed-point cells are corrected. The self-heating of the resistance thermometer is examined before the calibration begins and is taken into account when presenting the calibration results. The calibration results include the resistance and W-values of the resistance thermometer, as well as two calibration curves (coefficients) calculated according to ITS-90 (with measurement currents of 0 mA and 1 mA unless otherwise specified).<\/span><\/p>\n\n\n\n

The minimum immersion depth of the resistance thermometer is:<\/span><\/p>\n\n\n\n

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<\/i><\/mark> at –189 \u00b0C: 400 mm<\/strong><\/span><\/p>\n\n\n\n

<\/i><\/mark> in range from -38 \u00b0C to 660 \u00b0C: 300 mm<\/strong> <\/p>\n<\/div>\n\n\n\n

The maximum outer diameter<\/strong> is 8 mm.<\/strong><\/span><\/p>\n\n\n\n

Calibration duration: approximately 5 working days or as agreed.<\/span><\/p>\n<\/details>\n\n\n\n

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request calibration<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of a resistance thermometer via comparison calibration from -196 \u00b0C to 961 \u00b0C<\/strong><\/strong><\/p>\n<\/div>\n<\/div>\n\n\n\n

Accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of a resistance thermometer in the range from -196 \u00b0C to 961 \u00b0C.<\/p>\n\n\n\n

learn more<\/summary>\n

Accredited calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of a resistance thermometer in a calibration bath or furnace, in a nitrogen cryostat, or at boiling nitrogen at 5 temperature points (distributed across the calibration range or as specified by the customer). The following measurement uncertainties can be achieved (depending on the test specimen):<\/span><\/p>\n\n\n\n

Calibration Range<\/strong><\/span><\/td>Measurement Uncertainty<\/strong><\/span><\/td>Calibration Method<\/strong><\/span><\/td><\/tr>
-196 \u00b0C<\/span><\/td>15 mK<\/span><\/td>Nitrogen Boiling Point<\/span><\/td><\/tr>
-180 \u00b0C to -80 \u00b0C<\/span><\/td>60 mK<\/span><\/td>Nitrogen Cryostat<\/span><\/td><\/tr>
-80 \u00b0C to -60 \u00b0C<\/span><\/td>15 mK<\/span><\/td>
Calibration Bath
<\/span>  <\/span><\/td><\/tr>
-60 \u00b0C to 90 \u00b0C<\/span><\/td>10 mK<\/span><\/td><\/tr>
90 \u00b0C to 200 \u00b0C<\/span><\/td>30 mK<\/span><\/td><\/tr>
200 \u00b0C to 500 \u00b0C<\/span><\/td>40 mK<\/span><\/td>
Calibration Furnace<\/span>

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500 \u00b0C to 660 \u00b0C<\/span><\/td>50 mK<\/span><\/td><\/tr>
660 \u00b0C to 961 \u00b0C<\/span><\/td>150 mK<\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Before calibration, the resistance thermometer is sufficiently aged. The self-heating and hysteresis of the resistance thermometer are examined before the start of the calibration and are taken into account when presenting the calibration results.<\/span><\/p>\n\n\n\n

Calibration duration: approximately 5 working days or as agreed.<\/span><\/p>\n<\/details>\n\n\n\n

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request calibration<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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<\/i><\/mark><\/p>\n<\/div>\n\n\n\n

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Accredited comparison calibration according to DIN EN ISO\/IEC 17025 (DAkkS) of non-noble metal thermocouples, e.g., Type N<\/strong><\/strong><\/p>\n<\/div>\n<\/div>\n\n\n\n

Comparison calibration of non-noble metal thermocouples against reference thermocouples.<\/p>\n\n\n\n

learn more<\/summary>\n

Comparison calibration of non-noble metal thermocouples against reference thermocouples<\/span><\/strong><\/p>\n\n\n\n

Comparison calibration against reference thermocouples.<\/span><\/p>\n\n\n\n

DAkkS measurement uncertainty:<\/span><\/p>\n\n\n\n

Temperature Range<\/span><\/strong><\/td>Measurement Uncertainty<\/span><\/strong><\/td>Calibration Method<\/span><\/strong><\/td><\/tr>
-196 \u00b0C<\/span>
<\/span><\/td>		1.0 K<\/span><\/td>Nitrogen Boiling Point<\/span><\/td><\/tr>
-180 \u00b0C to -80 \u00b0C<\/span><\/td>1.0 K<\/span><\/td>Nitrogen Cryostat<\/span><\/td><\/tr>
-80 \u00b0C to 0 \u00b0C<\/span><\/td>1.0 K<\/span><\/td>Calibration Bath<\/span><\/td><\/tr>
0 \u00b0C to 961 \u00b0C<\/span><\/td>1.5 K<\/span><\/td>
Calibration Furnace
<\/span><\/td><\/tr>
961 \u00b0C to 1200 \u00b0C<\/span><\/td>2.5 K<\/span><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The minimum immersion depth<\/strong> of the thermometer is 190 mm (at -196 \u00b0C: 300 mm)<\/strong>.
The maximum outer diameter is 8 mm<\/strong>.
The achievable measurement uncertainties depend on the test specimen.<\/p>\n\n\n\n

Calibration duration: approximately 5 working days or as agreed.<\/span><\/p>\n<\/details>\n\n\n\n

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request calibration<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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Technical background<\/strong><\/h3>\n\n\n\n
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Calibrating thermometers at extremely low temperatures is a technical challenge. Conventionally, calibration baths or temperature block calibrators are used to calibrate thermometers in the negative temperature range. However, these quickly reach their limits when cooling and are only used down to around -80 \u00b0C.<\/p>\n\n\n\n

Calibration baths are cooled with compressors. To ensure stable control of the calibration temperature, an electric heater works \u2018against\u2019 the compressor, which always cools at maximum power. In addition, the calibration media used (such as silicone or ethanol) change their viscosity considerably and absorb water from the ambient humidity. Both of these factors make it difficult to control the temperature of the calibration baths. The lowest temperature that calibration baths with stable control can reach is around -80 \u00b0C.<\/p>\n\n\n\n

Temperature block calibrators are cooled with Peltier elements or Sterling motors. These technologies are limited and can be used down to about -50 \u00b0C with Peltier elements or -100 \u00b0C with Sterling motors.<\/p>\n\n\n\n

To overcome these limitations, we use liquid nitrogen as a \u2018cold source\u2019. This enables us to extend the temperature range when calibrating thermometers down to -196 \u00b0C.<\/p>\n<\/div>\n\n\n\n

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New digital archive Klasmeier Cloud:
Calibration documents quickly and easily available<\/strong><\/strong><\/h3>\n\n\n\n

The new Klasmeier Cloud \u2013 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. <\/p>\n\n\n\n

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.<\/p>\n<\/div>\n\n\n\n

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<\/i><\/mark><\/p>\n<\/div>\n<\/div>\n\n\n\n

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To Klasmeier Cloud<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Finding the right calibration solution for you<\/strong><\/strong><\/h2>\n\n\n\n
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Questions about our calibration services?<\/h3>\n\n\n\n


Please send your questions or enquiries to Mr Boris Kalb<\/strong>:<\/strong><\/strong><\/p>\n\n\n\n

<\/i> <\/mark>Get in touch now<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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Request calibration<\/strong><\/h3>\n\n\n\n
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