Myron L 6P and 4P - Manual (Page 37)

33
allowed to dry out. However, if this occurs, the sensor may sometimes
be rejuvenated by first cleaning the sensor well with Isopropyl alcohol
or a liquid spray cleaner such as Windex™ or Fantastic™ and rinsing
well. Do not scrub or wipe the pH/ORP sensor.
Then use one of the following methods:
1.
Pour a HOT salt solution ~60°C/140°F, preferably potassium
chloride (KCI) solution (Myron L pH/ORP 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.
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. Rinsing such
liquids from the pH/ORP sensor well and refilling it with Myron L Storage
Solution, a saturated KCl solution, pH 4 buffer, 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 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.
pH/ORP SENSOR
Top View
ORP
Electrode
pH Glass
Electrode
Sensor
Body
Reference
Junction
under Glass
pH Bulb