IM 50.560CA UA (B/4-03)
DEPOLOX
®
3 PLUS RESIDUAL ANALYZER
46
• pH Zero Calibration (Isothermal Intersection, pH7):
a. Starting at the basic display press the F key until the “CALI-
BRATION” menu is displayed. Press the ▼ key until the “pH
zero” menu is found.
b. Withdraw the pH sensor. Fill 10 to 20 ml “pH7.00” buffer solu-
tion into a 100 ml beaker. Dip the sensor at least 20mm deep in
the buffer solution pH7.00 and agitate lightly until the displayed
pH value remains constant.
c. Press the E key.
d. Press the ▼ or ▲ keys until the displayed value agrees with the
value of the pH buffer solution. Store this value using the E key.
• pH Span Calibration:
a. Rinse the sensor in distilled water (in order to avoid spreading
the buffer solution).
b. Press the key ▼ until the “pH span” menu is reached.
c. Pour 10 to 20ml pH4 or pH10 buffer solution into another bea-
ker. Dip the pH sensor at least 20mm deep in the buffer solution
and agitate lightly until the displayed pH value remains constant.
(In case another buffer solution is used: the pH value of the buffer
solution must be less than pH6 or greater than pH8.)
d. Press the E key to open the “pH Span” menu.
e. Press keys ▼ or ▲ until the displayed value agrees with the value
of the pH buffer solution. Store this value using the E key. The
measuring cell is now calibrated.
f. Replace the sensor into the flow block.
g. Dispose of the buffer solutions, rinse with enough water.
h. Return to the basic display by pressing the ● key twice or skip to
fluoride calibration.
In case of error, both calibration points must be calibrated again.
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