pH

Our Service in the calibration laboratory for pH

The pH value is an important quality criterion or process parameter for many manufacturing and monitoring processes. The application-specific calibration of the measuring system is therefore of crucial importance.

Based on our long-time experiences we offer accredited calibration services for the measuring quantity pH according to ISO/IEC 17025 with DAkkS calibration certificate and according to ISO/IEC 17025 with ISO Guide 34 with certificate of analysis.

Our pH reference materials / buffer solutions guarantee the quality-compliant metrological traceability of your pH measurement systems according to the requirements of DIN EN ISO 9001 and other quality standards.

In our calibration laboratory we apply internationally recognized calibration procedures:

  • Primary method with Harned cells (Development in cooperation with PTB)
  • Secondary method with differential potentiometric cell (Baucke cell)
  • Multipoint calibration with selected glass electrode systems

The validation of the calibration procedures is realised by participation in international key comparisons and comparison measurements.

 

 

Our range of services includes:

Certified pH reference materials and reference solutions (CRM)

  • according to ISO/IEC 17025 with ISO Guide 34
  • with DAkkS certificate of analysis
  • expanded measuring uncertainty U(k=2) = 0.003 to 0.004 (25 °C)

 

pH reference buffer solutions according to DIN 19266 and IUPAC Recommendations 2002

  • with DAkkS calibration certificate
  • expanded measuring uncertainty U(k=2) = 0.003 (25 °C)

 

Technical pH reference buffer solutions

  • with DAkkS calibration certificate
  • colour-coded on request
  • expanded measuring uncertainty U(k=2) = 0.01 to 0.02 (25 °C)

 

Our product information for pH reference buffer solutions and materials, including expanded measuring uncertainties, can be found in the current price list for pH and our price list for CRM.

 

Calibration of unknown pH buffer solutions

  • with DAkkS calibration certificate
  • expanded measuring uncertainty U(k=2) = 0.02 (25 °C)

 

Our complete range of services according to ISO/IEC 17025, including expanded measuring uncertainties, can be found in the Annex to accreditation certificate (D-K-15186-01-00).

For our certified reference materials according to ISO/IEC 17025 with ISO Guide 34 you can find our range of services in the Annex to accreditation certificate (D-RM-15186-01-00).

 

 

Electrical calibration of pH meters

  • with DAkkS calibration certificate
  • simulation of voltage values in the range of pH measurements

 

In addition to calibrating your pH meter with certified reference buffer solutions, we recommend the electrical calibration of your pH meter with DAkKS calibration certificate in our accredited calibration laboratory for electricity.

 

Calibration of pH meters with certificate (not part of accreditation scope)

  • calibration of pH meter and pH electrode (measuring chain)
  • using reference buffer solutions
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