Myron L 9PTK - Manual (Page 55)

51
Then use one of the following methods:
1. Pour a HOT salt solution ~60°C/140°F — a potassium
chloride (KCI) solution such as Myron L pH/ORP Sensor
Storage Solution is preferable, but 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. 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.
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 (ref. Replacement pH/ORP Sensor, pg.
56).
it is possible to desensitize the OrP sensor when measuring
high OrP solutions. to check the OrP sensor functioning, take
an OrP reading of myron l ph/OrP sensor storage solution. if
the reading is outside the range of 350-400 mv, clean Only the
platinum OrP electrode with myron l OrP conditioner solution-
soaked cotton swab, being careful not to touch the swab to the
glass bulb of the ph sensor.