{"id":3196,"date":"2024-04-13T10:58:27","date_gmt":"2024-04-13T08:58:27","guid":{"rendered":"https:\/\/www.klasmeier.com\/kalibrierung-von-normalthermometern\/"},"modified":"2026-05-12T15:33:52","modified_gmt":"2026-05-12T13:33:52","slug":"kalibrierung-von-normalthermometern","status":"publish","type":"page","link":"https:\/\/www.klasmeier.com\/en\/kalibrierdienst-klasmeier\/kalibrierung-von-normalthermometern\/","title":{"rendered":"Calibration of Standard Platinum Resistance Thermometers (SPRTs)"},"content":{"rendered":"\n
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Precise thermometer calibration for the highest demands<\/strong><\/h3>\n\n\n\n

Rely on our DAkkS-accredited calibration according to DIN EN ISO\/IEC 17025 for your Standard Platinum Resistance Thermometers (SPRT).We can calibrate your SPRTs over the entire temperature range of the ITS-90, ensuring maximum accuracy and traceability to international standards. <\/p>\n\n\n\n

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Our Services<\/h2>\n\n\n\n

<\/i><\/mark> Accredited calibration of SPRTs (length \u2265 300 mm)<\/strong><\/i><\/mark> Temperature range: -196\u00b0C to +961\u00b0C – full coverage of ITS-90<\/strong><\/i><\/mark> Calibration method: Fixed-point calibration at ITS-90 fixed points<\/strong><\/i><\/mark> Selectable calibration accuracy \u2013 from melting point to high-end freezing point calibration<\/strong><\/i><\/mark> Proficiency testing according to DIN EN ISO\/IEC 17043<\/strong><\/i><\/mark> Repair service for SPRTs in our own manufactory<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n\n

Your advantages at a glance<\/h2>\n\n
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Full flexibility in accuracy<\/strong><\/h4>\n\n\n\n

The choice is yours:<\/p>\n\n\n\n

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Calibration at melting points<\/strong>(economical, cost-effective, higher measurement uncertainty)<\/h4>\n<\/div>\n\n\n\n
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Calibration at freezing points<\/strong>(extremely low measurement uncertainty for the highest demands)<\/h4>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n
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Short turnaround times of 5 working days<\/strong><\/h4>\n\n\n\n

\u2192 Minimize downtime \u2013 your reference thermometers are quickly back in use.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Minimal measurement uncertainties<\/strong><\/h4>\n\n\n\n

\u2192 Benefit from maximum precision: We get the best out of your thermometer.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n

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Everything from a single source<\/strong><\/h4>\n\n\n\n

\u2192 Complete package from calibration and proficiency testing to repair \u2013 all at Klasmeier.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Central location in Fulda<\/strong><\/h4>\n\n\n\n

\u2192 Perfect accessibility \u2013 drop off your SPRT in person or use our secure courier service.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n

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Paperless documentation<\/strong><\/h4>\n\n\n\n

\u2192 Accessible at any time, legally signed. Full transparency and security via our modern cloud solution.<\/p>\n\n\n\n

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Details about our calibration service for SPRT reference thermometers<\/h2>\n<\/div>\n\n\n\n
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Why individual calibrations for SPRTs?<\/h3>\n\n\n\n

A Standard Platinum Resistance Thermometer (SPRT) is the most precise measuring instrument for representing the International Temperature Scale (ITS-90). To ensure your SPRT can reach its full potential, it must be calibrated exactly and individually at the defining fixed points. This provides you with reliable measurement results, fulfills standard requirements, and avoids expensive wrong decisions. <\/p>\n\n\n\n

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Our range of services at a glance<\/h3>\n\n\n\n
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Service<\/strong><\/td>Temperature range<\/strong><\/td>Method<\/strong><\/td>Typical expanded measurement uncertainty*<\/strong><\/td><\/tr>
Full Range Calibration<\/strong><\/td>\u2013189\u00b0C \u2026 660\u00b0C<\/td>Melting or freezing points<\/td>up to 3 mK<\/td><\/tr>
Partial range calibrations<\/strong><\/td>Freely selectable segments of the ITS-90, e.g., 0\u00b0C \u2026 419\u00b0C<\/td>Melting or freezing points<\/td>2 \u2013 6 mK<\/td><\/tr>
Extension modules<\/strong><\/td>Additional fixed points if the ITS-90 range does not fit perfectly. (Argon, Mercury, Gallium, Indium) <\/td>same as basic calibration<\/td>2 \u2013 10 mK<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

*all specifications for k = 2 (\u2248 95% confidence level)<\/p>\n\n\n\n

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Two proven methods \u2013 Melting vs. Freezing points<\/h3>\n\n\n\n

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Method<\/strong><\/td>Typical measurement uncertainties*<\/strong><\/td>Cost factor**<\/strong><\/td>Advantages<\/strong><\/td>Typical turnaround<\/strong><\/td><\/tr>
Melting point<\/strong>calibration<\/strong>(developed by Klasmeier & accredited)<\/td>Ar 10 mK Hg 3.5 mK WTP 2.5 mK Ga 2.5 mK Sn 7 mK Zn 12 mK Al 20 mK<\/td>\u2248 50% of the cost of a freezing point calibration<\/td>\u2022 Fast turnaround \u2022 Economical solution \u2022 Measurement uncertainties are sufficient for many applications \u2022 Ideal for reference thermometers as standards in calibration by the comparison method<\/td>approx. 5 working days<\/td><\/tr>
Freezing point<\/strong>calibration<\/strong>(most precise ITS-90 representation)<\/td>Ar 4 mK Hg 2.5 mK WTP 1.5 mK Ga 2 mK Sn 3 mK Zn 3 mK Al 5 mK<\/td>Reference<\/td>\u2022 Highest precision \u2022 Ideal for primary standards<\/td>approx. 7 working days<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

* k = 2, including ITS-90 deviation function (if specified). For measurement uncertainties, see the graphic below.<\/p>\n\n\n\n

** Exemplary comparison based on our full-range packages (KK-1413 vs. KK-1404). Depending on the partial range, the difference may vary slightly, but is typically around 40\u201360%. All prices and measurement uncertainties are taken from our service catalog. <\/p>\n\n\n\n

Conclusion:<\/strong> If maximum accuracy is required (e.g., for high-end primary standards), we unreservedly recommend freezing point calibration<\/strong>. For less critical applications \u2013 such as reference thermometers for secondary calibrations \u2013 the melting point calibration<\/strong> developed by Klasmeier<\/strong> offers a significantly more cost-effective alternative with still excellent overall uncertainty.<\/p>\n\n\n\n

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Measurement uncertainties and article numbers for an SPRT calibration at Klasmeier<\/h3>\n\n\n\n

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Art. No.<\/strong><\/td>Temperature range (\u00b0C)<\/strong><\/td>Fixed points<\/strong>*<\/td><\/tr>
KK-1404<\/strong><\/td>\u2013189 \u2026 660 \u00b0C<\/td>Ar 10 mK, Hg 3.5 mK, WTP 2.5 mK, Ga 2.5 mK, Sn 7 mK, Zn 12 mK, Al 20 mK<\/td><\/tr>
KK-1424<\/strong><\/td>\u2013189 \u2026 660 \u00b0C<\/td>Ar 4 mK, Hg 2.5 mK, WTP 1.5 mK, Ga 2.0 mK, Sn 3 mK, Zn 3 mK, Al 5 mK<\/td><\/tr>
KK-1402<\/strong><\/td>0 \u2026 660 \u00b0C<\/td>WTP 2.5 mK, Ga 2.5 mK, Sn 7 mK, Zn 12 mK, Al 20 mK<\/td><\/tr>
KK-1401<\/strong><\/td>0 \u2026 660 \u00b0C<\/td>WTP 1.5 mK, Ga 2.0 mK, Sn 3 mK, Zn 3 mK, Al 5 mK<\/td><\/tr>
KK-1411<\/strong><\/td>0 \u2026 419 \u00b0C<\/td>WTP 1.5 mK, Ga 2.0 mK, Sn 3 mK, Zn 3 mK<\/td><\/tr>
KK-1408<\/strong><\/td>0 \u2026 419 \u00b0C<\/td>WTP 2.5 mK, Ga 2.5 mK, Sn 7 mK, Zn 12 mK<\/td><\/tr>
KK-1409<\/strong><\/td>0 \u2026 230 \u00b0C<\/td>WTP 2.5 mK, Ga 2.5 mK, In 5.5 mK, Sn 7 mK<\/td><\/tr>
KK-1413<\/strong><\/td>0 \u2026 156 \u00b0C<\/td>WTP 1.5 mK, Ga 2.0 mK, In 4.5 mK<\/td><\/tr>
KK-1410<\/strong><\/td>0 \u2026 29 \u00b0C<\/td>WTP 1.5 mK, Ga 2.0 mK<\/td><\/tr>
KK-1405<\/strong><\/td>\u2013189 \u2026 29 \u00b0C<\/td>Ar 4 mK, Hg 2.5 mK, WTP 1.5 mK, Ga 2.0 mK<\/td><\/tr>
KK-1412<\/strong><\/td>\u2013189 \u2026 29 \u00b0C<\/td>Ar 10 mK, Hg 3.5 mK, WTP 2.5 mK, Ga 2.5 mK<\/td><\/tr>
KK-1400<\/strong><\/td>\u201338 \u2026 29 \u00b0C<\/td>Hg 2.5 mK, WTP 1.5 mK, Ga 2.0 mK<\/td><\/tr>
KK-1406<\/strong><\/td>\u201338 \u2026 29 \u00b0C<\/td>Measurement uncertainties on request<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

* k = 2, for measurement uncertainties see graphic below.<\/p>\n\n\n\n

The specified values apply directly at the respective fixed points. In the intermediate ranges, experience shows that uncertainties are approximately 0.5 \u2013 2 mK higher. <\/p>\n\n\n\n

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Scope of services for SPRT calibrations<\/h2>\n\n\n\n
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A DAkkS-accredited calibration according to DIN EN ISO\/IEC 17025 of a reference thermometer (WGa \u2265 1.11807, WHg \u2264 0.844235) at freezing, melting, and triple points of the ITS-90. The most important service elements at a glance:<\/p>\n\n\n\n

Smallest measurement uncertainties at the fixed points (k = 2)<\/strong><\/p>\n\n\n\n