KROHNE OPTISENS PAM 2080 EN - Manual (Page 31)

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6.2.1 Producing calibration standards (ISE)
1st standard (lower concentration) sample volume approx. 800 ml:
Fill a clean vessel (1-ltr. beaker) with approx. 400 ml measuring water.
Dilute with drinking/processing water to approx. 800 ml calibration solution.
For sewage works: optimum dilution water is drained water from final sedimentation.
Determine the precise concentration of the 1st standard solution in the laboratory, please note
measurement.
2nd standard (upper concentration) sample volume approx. 800 ml:
Fill a clean vessel (1-ltr. beaker) with approx. 800 ml measuring water.
Using a suitable standard salt increase the concentration in the sample.
Determine the precise concentration of the 2nd standard solution in the laboratory, please note
measurement.
Where necessary, the mix ratios should be adapted to the optimum measuring range by means of
trials. You can obtain information on suitable standard salts from KROHNE.