Owner's manual

28
D. Cleaning Sensors
1. Conductivity/TDS/MIN/SALT
The conductivity cell cup should be kept as clean as possible. Flushing
with clean water following use will prevent buildup on electrodes.
However, if very dirty samples — particularly scaling types — are
allowed to dry in the cell cup, a lm will form. This lm reduces accuracy.
When there are visible lms of oil, dirt, or scale in the cell cup or on the
electrodes, use isopropyl alcohol or a foaming non-abrasive household
cleaner. Rinse out the cleaner and your Po o l Pr o is ready for accurate
measurements.
2. pH/ORP
The unique pH/ORP sensor in your Po o l Pr o is a nonrellable
combination type that features a porous liquid junction. It should not be
allowed to dry out. If it does, the sensor may sometimes be rejuvenated
by rst 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 ne
— 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.
pH/ORP SENSOR
Top View
ORP
Electrode
pH Glass
Electrode
Sensor
Body
Reference
Junction
under Glass
pH Bulb