Mv Measurement - Consort C732 Mode D'emploi

Maintenance:
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 inter-
ruptions (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 con-
tamination 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 aper-
ture 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!). If the electrode is polluted
by proteinaceous materials (such as blood), it should stand in a pepsin solution
overnight and then be cleaned before use. The pH electrode wears away by being
used. If the electrode tends to respond slower and calibration becomes difficult,
even after cleaning, it should be replaced by a new one.
1. Select the mV range by pressing MODE. The display will immediately show the
measured mV according to the previous calibration. Should you want to recali-
brate, press CAL.
2. Immerse the electrodes in a standard solution of known potential.
3. The display shows e.g. [MV=204]. Calibrate to the proper value with Ù or Ú and
press CAL again or press RES to reset the absolute readings.
4. After rinsing the electrodes with distilled water, immerse them in the solution
to be measured and read the display.
5. Rinse the electrodes always with distilled water after use and store them in a
3...4 M KCl solution.
∗ Press RES to switch between mV readings referred to a standard hydrogen elec-
trode [MV.H] or not [MV].
1. Select the rH 2 [rH] range by pressing MODE.
2. After calibrating and rinsing the pH and redox electrodes with distilled water,
immer se them in the solution to be measured and read the display.
C732 C732

mV measurement

rH 2 2 measurement
10 / 43 10 / 43