IMPORTANT - pH Probe Care
The pH Probe is the only part of the Guardian Monitor that should ever require replacing. pH Probes
DO NOT last forever. They age through normal use and will eventually fail. The life time of a pH probe
depends on the environment it is used in and the way that it is treated. To ensure you receive a long life
from your pH probe, please ensure you follow the guide below.
pH probes contain glass and are therefore FRAGILE. With good care, they will give a long service life.
DO NOT allow the probe tip to dry. IF IT DRIES IT DIES!
DO NOT bend the probe; this will break its internal glass stem.
DO NOT knock the probe; this will break its internal glass stem or external glass bulb.
DO NOT plunge a cold pH probe into a hot liquid - sudden temperature changes can crack the glass and
permanently damage the probe.
DO NOT immerse in oils, proteins or suspended solids that will leave a coating on the glass bulb.
DO NOT ‘kink’ or bend the lead sharply.
DO NOT attempt to lengthen the lead on the probe.
DO NOT wet the BNC connector at the end of the lead.
Preparing the pH probe for use
Remove the wetting cap by gently sliding/twisting the cap off without bending the pH probe. Store the
wetting cap in a safe place.
When storing the pH Probe;
The probe tip must be kept moist. To prepare the probe for storage, place a very small amount clean water
(never distilled or deionised water) or pH 4.0 solution into the wetting cap, then place wetting cap over the
probe tip. If for some reason the probe tip has been allowed to dry out, then the probe must be ‘hydrated’
for 24 hours in fresh clean water or pH 4.0 solution. Following this; carry out a calibration to check
operation, as the probe may have already suffered permanent damage.
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