Myron L PS6FCE - Manual (Page 37)

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than 4 hours (longer can deplete the reference solution
and damage the glass bulb). Retest.
If neither method is successful, the sensor must be replaced.
“Drifting” can be caused by a film on the pH sensor bulb and/or
reference. Use isopropyl alcohol (IPA) or spray a liquid cleaner such
as Windex™ or Fantastic™ into the sensor well to clean it. The sensor
bulb is very thin and delicate. Do not scrub or wipe the pH/ORP sensor.
Leaving high pH (alkaline) solutions in contact with the pH sensor for
long periods of time is harmful and will cause damage. Rinse such
liquids from the pH/ORP sensor well and refill it with Myron L Storage
Solution to extend the useful life of the sensor. If unavailable, you can
use a saturated KCl solution, pH 4 buffer, or a saturated solution of table
salt and tap water, but this should be replaced with storage solution as
soon as possible.
Samples containing chlorine, sulfur, or ammonia can “poison” any pH
electrode. If it is necessary to measure the pH of any such sample,
thoroughly rinse the sensor well with clean water immediately after
taking the measurement. Any sample element that reduces (adds an
electron to) silver, such as cyanide, will attack the reference electrode.
Replacement sensors are available only from the Myron L Company or
its authorized distributors.