Mv Measurement; Rh Measurement - Consort C832 Anleitung

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 a refillable electrode! Therefore always remove the
closure from the refilling aperture during the measurements as well as during the
calibration. 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 solu-
tion. 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!).
If the electrode is polluted by proteinaceous materials (such as blood), it should
stand in a cleaning solution overnight and then be cleaned with distilled water
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.
2. After rinsing the electrodes with distilled water, immerse them in the solution
to be measured and read the display.
3. Rinse the electrodes always with distilled water after use and store them in a
3...4 M KCl solution.
Calibration:
1. Select the mV range by pressing MODE.
2. Press CAL to adjust the mV scale with any reference. Immerse the electrodes
in a standard solution of known potential.
3. The display shows e.g. [MV=476.3]. Adjust to the proper value and press CAL
again or press RES to reset the absolute readings.
Relative mV measurements (not C838):
1. While in the mV range, press Ù. At that moment the instrument stores the
actual mV and automatically subtracts it from all next measurements. You can
repeat this as many times as required. A blinking [r] in the display appears.
2. To cancel relative mV readings, press MODE and you will be in the normal
measuring mode again.
• Press RES to change the resolution from 1 to 0.1 mV. (not C831)
• C838: press Ù or Ú to switch between mV readings referred to a standard
hydrogen electrode [MV.H] or not [MV].
(C838)
1. Select the rH range by pressing MODE.
2
2. After calibrating and rinsing the pH and redox electrodes with distilled water,
immerse them in the solution to be measured and read the display.
C831 • C832 • C833 • C835 • C838

mV measurement

rH measurement
2
11 / 74