MAINTENANCE
pH Probe
It is important to keep the pH
probe wet when the meter is
not in use. The probe is well
protected by a plastic bottle
containing solution. To use
or store the probe:
1. Rotate the bottle to remove
from the probe. Pull down
the cover and remove it
from the probe.
2. After use, put cover back on
the probe and plug the probe
into the bottle. Rotate the
bottle to fit into the cover tightly.
The following actions will keep the probe in good working condition.
• Always keep the pH glass bulb wet by using the plastic bottle
to protect and store the probe. You can also store in a KCl
solution. Never use distilled or de-ionized water for storage.
• Always rinse pH probe in de-ionized water before using.
• Never touch or rub the glass bulb tip.
Probe Testing
1. Connect the ORP probe to the meter via the BNC connector.
2. Put the probe in a buffer solution of pH 7.00 with saturated
quinhydrone.
3. Stir; mV reading (E1) should be 86 ±15mV.
4. Rinse the probe with distilled water between each use. Keep
the ORP probe wet. If not in use for long periods, it should be
rinsed and stored in the soaker bottle filled with the saturated
KCL solution.
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