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Identification No: 037
#
VALUE
0001
7.34
0002
7.21
0003
7.08
0004
6.71
0005
6.49
Permits to diagnose the performance of the electrodes.
1.
Press SET until the display shows [diAGn].
2.
Sequentially press CAL to show the calibration details of all connec-
ted electrodes, e.g:
[94.6%]
(slope)
[6.89 pHo] (ISO-potential)
[cc=1.034] (cell constant)
3.
Press CAL to continue or press SET to return.
The pH/mV electrodes should be connected to the coaxial pH/mV con-
nectors (1 & 2). If separate electrodes are used, connect the reference
electrodes to the REF. terminals. Connect a 2-pole conductivity cell to the
coaxial EC input or connect a 4-pole conductivity cell to the DIN input.
Never connect both types at the same time to the instrument!
Automatic temperature compensation and temperature measurements
are possible by plugging a Pt1000 thermocompensator into the °C
terminals. Without compensator, the manual temperature compensation is
automatically switched on.
pH-MEASUREMENT
A pH electrode is active and stable only after wetting! For this purpose
it must be immersed for at least ten hours in a 3...4 M KCl solution.
During short interruptions (e.g. storage) the electrode should be immersed
in a 3...4 M KCl solution. In doing this it is always kept ready for use. When
the interruption is longer than a month, refill the closing cap with 3...4 M
KCl and plug it on the electrode tip in order to protect the glass bulb.
Before use, ensure that the reference part of the electrode is topped up
with a 3...4 M KCl solution.
Avoid a low pressure inside the electrode! Therefore always remove
the closure from the refilling aperture during the measurements as well as
during the standardisation. This allows the saltbridge solution to flow
through the ceramic liquid junction and prevents contamination of the
electrolyte. For the same reason, the inside level should always be higher
than the outside level of the measuring solution. Close the refilling
aperture again when storing the electrode.
A polluted electrode may be cleaned with a soft detergent or 0.1 M HCl.
Greasy substances may be removed with acetone or alcohol (never do
this with plastic electrodes!).
UNIT
C
CH
pH
23.7
2
pH
23.7
2
pH
23.8
2
pH
23.8
2
pH
23.9
2
H
D
13:19:57
29/01/95
13:20:57
29/01/95
13:21:57
29/01/95
13:22:57
29/01/95
13:23:57
29/01/95
Diagnosis
Inputs
Maintenance
9
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