Hach POLYMETRON 8362 User Manual

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Hach POLYMETRON 8362 User Manual Manual pdf 38 page image

Transmitter 9135 - pH measurement in pure waterPage 34The temperature of the buffer solution needs to beentered only if the transmitter is operated in themanual temperature-compensation mode.In the « automatic calibration » mode the transmitterdetermines the pH value according to the temperature.In the other calibration modes, the nominal pH valuesmust always be taken into account.For a precise calibration of the pH electrode, 2 buffersolutions are required one of which should have a pHclose to the sample pH. The pH 7 buffer solution (or6.88 à 25°C) ) is required for a first standardizationand a pH 4 buffer solution (or 4.01 to 25°C) or pH 10(or 9.22 to 25°C) is required to calibrate the electrodeslope.Choice of the calibration typeDifferent calibration types may be selected. In theCALIBRATION menu :• Press CHOICE to select pH standard.• Press Enter.• Press CHOICE to select PROGRAMMING.• With the right function key, choose the calibrationtype.Automatic calibrationWith the right function key, select the buffer type youuse so that the instrument determines precisely thebuffer value according to the temperature.You have the choice between three tables : NIST,DIN 9, DIN 10 which corresponds to the standardbuffer values whose value varies according to thetemperature as indicated in the previous chapterdedicated to the buffer solutions.TYPE :TAMP : NISTpH CALIB.Auto