{"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":"2025-06-30T09:28:15","modified_gmt":"2025-06-30T07:28:15","slug":"kalibrierung-von-normalthermometern","status":"publish","type":"page","link":"https:\/\/www.klasmeier.com\/en\/kalibrierdienst-klasmeier\/kalibrierung-von-normalthermometern\/","title":{"rendered":"Calibration of standard thermometers"},"content":{"rendered":"\n
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Precise Thermometer Calibration for the Highest Standards<\/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 (SPRTs).<\/p>\n\n\n\n

We calibrate your SPRTs across the full temperature range of ITS\u201190 and guarantee the highest 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\u202f300\u202fmm)<\/strong>
<\/i><\/mark> Temperature range: \u2013196\u202f\u00b0C to +961\u202f\u00b0C \u2013 full ITS\u201190 coverage<\/strong>
<\/i><\/mark> Calibration method: fixed-point calibration at ITS\u201190 fixed points<\/strong>
<\/i><\/mark> Selectable calibration accuracy \u2013 from melting-point to high-end freezing-point calibration<\/strong>
<\/i><\/mark> Suitability testing per DIN EN ISO\/IEC 17043:2023<\/strong>
<\/i><\/mark> In-house repair service for SPRTs<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

Your Benefits<\/h2>\n\n\n\n
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Full flexibility in accuracy<\/strong><\/h4>\n\n\n\n

You choose:<\/p>\n\n\n\n

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Melting-point calibration<\/strong>

(cost-effective, slightly higher uncertainty)<\/h4>\n<\/div>\n\n\n\n
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High-end freezing-point calibration<\/strong>

(ultra-low uncertainty for highest demands)
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Fast turnaround in 5 working days<\/strong><\/h4>\n\n\n\n

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

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

\u2192 Achieve the highest precision: we bring out the best
in your thermometer.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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All-in-one solution<\/strong><\/h4>\n\n\n\n

\u2192 Complete package: calibration, suitability testing,
repair \u2013 all under one roof.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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

\u2192 Easily accessible \u2013 drop off your SPRT or use our secure courier service.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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

\u2192 Legally signed and accessible at any time via our modern cloud solution.<\/p>\n\n\n\n

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Details of Our SPRT Calibration Service<\/h2>\n<\/div>\n\n\n\n
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Why individual calibrations for SPRTs?<\/h3>\n\n\n\n

An SPRT is the most precise instrument for realizing the International Temperature Scale (ITS\u201190). To unlock its full potential, it must be precisely and individually calibrated at defined fixed points. This ensures reliable results, compliance with standards, and avoids costly errors.<\/p>\n\n\n\n

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Our services<\/h3>\n\n\n\n
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Service<\/strong><\/td>Temperature range<\/strong><\/td>Method<\/strong><\/td>Typical expanded uncertainty*<\/strong><\/td><\/tr>
Full-range calibration<\/strong><\/td>\u2013189\u202f \u00b0C \u2026 660 \u202f\u00b0C<\/td>Melting\u2011 or freezing-points<\/td>up to 3 \u202fmK<\/td><\/tr>
Partial-range calibrations<\/strong><\/td>User\u2011selectable ITS\u201190 segment (e.g. 0\u202f\u00b0C \u2026 419\u202f\u00b0C)<\/td>Melting\u2011 or freezing-points<\/td>2\u202f\u2013\u202f6 \u202fmK<\/td><\/tr>
Extension modules<\/strong><\/td>Additional fixed points for non-standard ranges (Argon, Mercury, Gallium, Indium) same as base calibration<\/td>like basic calibration<\/td>2\u201310\u202fmK<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

* All uncertainties given for k\u202f=\u202f2 (~95\u202f% confidence).<\/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 calibration<\/strong>\u00a0
(developed & accredited by Klasmeier)<\/td>		Argon 10 \u202fmK
Hg 3,5 \u202fmK
WTP 2,5 \u202fmK
Ga 2,5 \u202fmK
Sn 7\u202f mK
Zn 12 \u202fmK
Al 20\u202f mK<\/td>		~50\u202f% of freezing\u2011point calibration cost<\/td>\u2022 Economical
\u2022 Uncertainty sufficient for many applications
\u2022 Ideal for reference thermometers using comparison method <\/td>		about\u00a05\u00a0working days<\/td><\/tr>
Freezing-point calibration<\/strong>\u00a0
(most accurate ITS\u201190 realization)<\/td>		Argon 4\u202fmK
Hg 2,5\u202fmK
WTP 1,5\u202fmK
Ga 2\u202fmK
Sn 3\u202fmK
Zn 3\u202fmK
Al 5\u202fmK<\/td>		Reference<\/td>\u2022 Highest precision
\u2022 Ideal for primary standards<\/td>		about\u00a07\u00a0working days<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

* k\u202f=\u202f2, including ITS\u201190 deviation function (if specified).
** Example comparison using full-range packages (KK\u20111413 vs KK\u20111404). Depending on segment, difference ~40\u201360\u202f%. All data per our price list.<\/p>\n\n\n\n

Conclusion:<\/strong> For highest accuracy (e.g. primary standards), freezing-point calibration is recommended. For less-critical references (e.g. secondary calibrations), Klasmeier\u2019s melting-point calibration offers a far more economical choice with excellent overall uncertainty.<\/p>\n\n\n\n

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Measurement Uncertainties and Article Numbers of SPRT Calibration at Klasmeier (k=2)<\/h3>\n\n\n\n

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Art.-No.<\/strong><\/td>Temperature range (\u00b0C)<\/strong><\/td>Fixed points\u00a0&\u00a0Expanded Uncertainty<\/strong><\/td><\/tr>
KK\u20111404<\/strong><\/td>\u2013189 \u2026 660 \u00b0C<\/td>Ar 10\u202fmK, Hg 3,5\u202fmK, WTP 2,5\u202fmK, 
Ga 2,5\u202fmK, Sn 7\u202fmK, Zn 12\u202fmK, Al 20\u202fmK<\/td><\/tr>
KK\u20111424<\/strong><\/td>\u2013189 \u2026 660 \u00b0C<\/td>Ar 4\u202fmK, Hg 2,5\u202fmK, WTP 1,5\u202fmK, 
Ga 2,0\u202fmK, Sn 3\u202fmK, Zn 3\u202fmK, Al 5\u202fmK<\/td><\/tr>
KK\u20111402<\/strong><\/td>0 \u2026 660 \u00b0C<\/td>WTP 2,5\u202fmK, Ga 2,5\u202fmK, Sn 7\u202fmK, 
Zn 12\u202fmK, Al 20\u202fmK<\/td><\/tr>
KK\u20111401<\/strong><\/td>0 \u2026 660 \u00b0C<\/td>WTP 1,5\u202fmK, Ga 2,0\u202fmK, Sn 3\u202fmK, 
Zn 3\u202fmK, Al 5\u202fmK<\/td><\/tr>
KK\u20111411<\/strong><\/td>0 \u2026 419 \u00b0C<\/td>WTP 1,5\u202fmK, Ga 2,0\u202fmK, Sn 3\u202fmK, Zn 3\u202fmK<\/td><\/tr>
KK\u20111408<\/strong><\/td>0 \u2026 419 \u00b0C<\/td>WTP 2,5\u202fmK, Ga 2,5\u202fmK, Sn 7\u202fmK, Zn 12\u202fmK<\/td><\/tr>
KK\u20111409<\/strong><\/td>0 \u2026 230 \u00b0C<\/td>WTP 2,5\u202fmK, Ga 2,5\u202fmK, In 5,5\u202fmK, Sn 7\u202fmK<\/td><\/tr>
KK\u20111413<\/strong><\/td>0 \u2026 156 \u00b0C<\/td>WTP 1,5\u202fmK, Ga 2,0\u202fmK, In 4,5\u202fmK<\/td><\/tr>
KK\u20111410<\/strong><\/td>0 \u2026 29 \u00b0C<\/td>WTP 1,5\u202fmK, Ga 2,0\u202fmK<\/td><\/tr>
KK\u20111405<\/strong><\/td>\u2013189 \u2026 29 \u00b0C<\/td>Ar 4\u202fmK, Hg 2,5\u202fmK, WTP 1,5\u202fmK, 
Ga 2,0\u202fmK<\/td><\/tr>
KK\u20111412<\/strong><\/td>\u2013189 \u2026 29 \u00b0C<\/td>Ar 10\u202fmK, Hg 3,5\u202fmK, WTP 2,5\u202fmK, 
Ga 2,5\u202fmK<\/td><\/tr>
KK\u20111400<\/strong><\/td>\u201338 \u2026 29 \u00b0C<\/td>Hg 2,5\u202fmK, WTP 1,5\u202fmK, Ga 2,0\u202fmK<\/td><\/tr>
KK\u20111406<\/strong><\/td>\u201338 \u2026 29 \u00b0C<\/td>Uncertainties upon request<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The stated values apply directly at the respective fixed points.
Uncertainties in intermediate ranges typically increase by about 0,5 \u2013 2\u202f mK.<\/p>\n\n\n\n

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Scope of Services for SPRT Calibration<\/h2>\n\n\n\n
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DAkkS-accredited calibration according to DIN EN ISO\/IEC 17025 for standard thermometers (WGa = 1.11807, WHg = 0.844235) at freezing, melting, and triple points per ITS-90.<\/p>\n\n\n\n

Minimum uncertainties at fixed points (k=2):<\/strong><\/p>\n\n\n\n