Bluelab Guardian Monitor - Manual (Page 14)

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14.0 Cleaning the Bluelab pH Probe
To ensure accurate readings the pH probe tip needs to be rinsed in water after each use
and cleaned prior to calibration using the following instructions.
The storage cap must always be put back on after cleaning. Always ensure it contains
enough Bluelab pH Probe KCl Storage Solution to cover the probe tip.
Remove storage cap from pH probe.
Hold the top of the storage cap, twist the cap to
loosen then remove.
Rinse pH probe tip under fresh tap water.
Never use RO (Reverse Osmosis), Distilled or De-
ionized water.
Fill a small plastic container with clean tap water.
Add a small amount of Bluelab pH Probe Cleaner
or mild detergent (dishwashing liquid).
Gently stir the probe tip in the mixture.
Ensure that you do not ‘knock’ the soil pH probe
on the side of the container as this may cause
damage to the probe.
Rinse well under fresh running water to remove all
traces of the detergent mixture.
If the probe tip requires removal of heavy
contamination: Gently brush around the
glassware with a few drops of Bluelab pH Probe
Cleaner or mild detergent (dishwashing liquid) and
a soft toothbrush.
Rinse well under fresh running tap water to
remove all traces of the detergent mixture.
Calibrate pH probe after cleaning, see section
10.0 After calibration, store pH probe in the
storage cap, ensuring there is enough KCl Storage
Solution to cover the probe tip.
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15.0 Hydrating the pH probe
Hydrate the pH probe in Bluelab pH Probe KCl Storage Solution when:
• the probe tip has not always been stored in KCl storage solution, to improve the
reading response speed.
• the probe tip has been accidentally allowed to dry out.
Never use RO (Reverse Osmosis), De-ionized or Distilled water. Pure water changes the chemistry in the reference,
causing the probe to die.
Loosen, then remove the storage cap. Place the pH probe
upright in a plastic container.
Clean the pH probe tip. Ensure the probe tip is cleaned
before hydrating. See section 14.0 for instructions.
Add enough Bluelab pH Probe KCl Storage Solution to a
plastic container to submerge the pH probe tip.
Leave to soak for at least 24 hours. After hydration, always
calibrate the pH probe to ensure accuracy, see section 10.0.
Bluelab pH
Probe KCl
Storage
Solution
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