Myron L PS9TK - Manual (Page 52)

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Open instrument carefully. Carefully detach battery from circuit board.
Replace with 9 Volt alkaline battery. Replace bottom, ensuring the
sealing gasket is installed in the groove of the top half of case. Re-install
screws, tighten evenly and securely.
nOTE: Because of nonvolatile EEPROM circuitry, all data stored in
memory and all calibration settings are protected even during power
loss or battery replacement. However, loss of time and date may occur if
battery is removed for longer than 3 minutes (180 seconds).
C. pH/ORP Sensor Replacement
Order model RPR. When ordering, be sure to include the model and serial
number of your instrument to ensure receipt of the proper type. Complete
installation instructions are provided with each replacement sensor.
D. Cleaning Sensors
1. Conductivity/MIN/SALT/TDS
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 film will form. This film reduces accuracy.
When there are visible films 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 P
OOL
P
RO
is again ready for
accurate measurements.
2. pH/ORP
The unique pH/ORP sensor in your P
OOL
P
RO
is a nonrefillable combination
type that features a porous liquid junction. (See Figure 27.) It should not
be 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.
pH/ORP SENSOR
Top View
ORP
Electrode
pH Glass
Electrode
Sensor
Body
Reference
Junction
under Glass
pH Bulb
Figure 27