Myron L TH1 - Manual (Page 25)

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chloride (KCI) solution (Myron L pH Sensor Storage Solution)—
HOT tap water with table salt (NaCl) will work fine — in the
sensor well and allow to cool. Retest.
or
2. Pour DI water in the sensor well and allow to stand for no more
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
junction. 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 sensor.
Leaving high pH (alkaline) solutions in contact with the pH sensor for long
periods of time is harmful and will cause damage. Rinsing such liquids
from the pH sensor well and refilling it with Myron L pH Sensor Storage
Solution, a saturated KCl solution or a saturated solution of table salt and
tap water, will extend the useful life.
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 pH 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 pH sensors are available only from the Myron L Company
or its authorized distributors.
pH Sensor
Top View
pH Glass
Electrode
Sensor
Body
Reference
Junction
under Glass
pH Bulb