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3.0 IMPORTANT - pH pen probe care
pH probes do not last forever. They age through normal use and will
eventually fail. The lifetime of a probe depends on the environment it is used
in and the way it is treated. To ensure you receive a long life from your pen,
please ensure you follow the guide below.
Storing the pH pen
When storing the pH pen, the probe tip must be kept moist.
Add 3-5 drops of KCl storage solution into the wetting seal
inside the storage cap once a week. Never use RO, Distilled
or De-ionized water. Place the seal and cap over the probe tip.
Long term storage
For long term storage, remove the cap and place the pen upright in a plastic container.
Cover the probe tip with KCl storage solution to ensure constant hydration. Check the
container regularly and top up the KCl storage solution as needed.
If the probe has been accidentally allowed to dry out:
The probe must be ‘hydrated’ for 24 hours in KCl storage solution (never use RO,
Distilled or Deionised water). Following this; carry out a calibration to check if the
probe has already suffered permanent damage.
DO NOT let the probe tip dry. IF IT DRIES IT DIES!
DO NOT knock the pen; this will break its external glass bulb or internal
glass tube.
DO NOT touch the glass bulb with your ngers as this will contaminate the
glass.
DO NOT plunge a cold probe into a hot liquid (or visa versa) - sudden
temperature changes can crack the glass and permanently damage the pen.
DO NOT soak or rinse the pH probe in RO (Reverse Osmosis), Distilled
or De-ionized water. Pure water changes the chemistry in the reference,
causing the probe to die.
DO NOT immerse in oils, proteins or suspended solids that will leave a
coating on the glass bulb.
Temperature probe
Glass bulb
Wick
Storage cap
Wetting seal
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