Xylem MULTI 3500i HANDHELD MULTIPARAMETER METERS - Manual (Page 40)

Operation Multi 3500i
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4.4.7 Carrying out a ConCal calibration
Single-point calibration Use any buffer solution for this rapid method.
The calibration will be the more exact the nearer the pH value of the
buffer solution is to that of the test sample.
Two-point calibration Use two buffer solutions for this procedure:
z first buffer solution: pH 7.0 ± 0.5
z any other buffer solution
For this calibration, Calibration type ConCal must be set in the sensor
menu (see section 4.4.4).
1 In the measured value display, select the pH or mV measuring
window with <
▲> <▼> and <M>.
2 Start the calibration with <CAL>.
The calibration display appears.
3 Thoroughly rinse the electrode with distilled water.
4 Immerse the electrode in buffer solution 1.
5 Set the nominal buffer value for the measured temperature with
<MENU/ENTER> and <
▲> <▼>. Then confirm the value with
<MENU/ENTER>.
6 If the Set temperature menu item appears, measure and enter
the temperature of the buffer manually (measurement without
temperature sensor).
7 Select Continue with <
▲> <▼> and press <MENU/ENTER>.
The buffer is measured.
The measured value is checked for stability (AutoRead).
i Immerse sensor in buffer 1
i Temperature = 24.8 °C
Set buffer: 7.00
Continue
pH <CAL>