Reliable Measurement and Traceable Documentation of pH Values

摘要

Using pH meters shows how large the gap can be between theory and practice. Although GLP- or ISO-compliant documentation of measured data is the standard today in most laboratories and is automatically supported by many lab instruments as an expected feature, a closer look at their data logs reveals missing data, which compromises the complete traceability of the results. The reason is that the pH meter and sensor, or electrode, are two components of one system, which deliver the result of a measurement, the pH, only when operated in conjunction. With the new DocuClip and DocuMeter, the laboratory equipment provider Sartorius has solved this problem in a convincingly simple way. Inseparably attached to the pH electrode, the Sartorius DocuClip saves and identifies the type designation and serial number of its "own" electrode. Moreover, DocuClip securely stores the data of up to five complete calibration datasets in its "rolling memory". As soon as DocuClip is connected to the DocuMeter, the electrode data available in the DocuClip are transmitted to the DocuMeter, which uses these data for measurement evaluation and meticulous data recording. Updated calibration data are written to DocuClip's memory where they are irreversibly linked to the matching electrode.