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Calibration of pH meters and glass electrodes at the National Physical - page 6 / 7

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    Calibration of a temperature compensator is done by comparing temperature values measured using this compensator with the readings of the reference thermometer traceable to the national temperature standard.

    The national primary standard of pH is used also for certification of buffers for pH measurements [9].

    Thus, we are offering the following services based on the national primary standard of pH value and other INPL standards:

Calibration of a pH-meter (as a voltmeter).

Calibration of an automatic temperature compensator (as a thermometer).

Calibration of a glass electrode.

Certification of buffers for pH- measurements.

These calibrations ensure the shortest unbroken traceability chain to the national standard of pH value and other INPL standards as required by ISO 17025 [10] for calibrations of any measurement instrument.

References

1.

P. Spitzer, B. Werner. Improved reliability of pH measurements. Analyt. and Bioanalyt. Chem. 2002, v. 374, pp. 787-795.

2.

Measurement of pH value of clear aqueous solutions. German Standard DIN 19268, 1985.

3.

International Vocabulary of Basic and General Terms in Metrology. 2nd ed., International Organization for Standardization, 1993, Switzerland.

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