IM 12B03D02-01E
6-6
6
.
Maintenance
6.8 Storage and O-ring/Gasket Replacement
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Storage Precautions
Care is required when storing the meter and sensor. To maintain in good condition,
observe the following:
(1) Before storage, wash off remaining sample solution from the sensor with water.
Deposits on the liquid junction, if any, must be removed thoroughly, or the
junction may be clogged. A clogged junction will cause invalid measurements,
e.g., unstable pH readings.
Keep a wetting cap attached to the sensor. For KCl refillable type sensors, seal
the fill hole with a plug.
(2) Leave the sensor connected to the meter body to protect the connectors and
O-ring from staining. Contamination may cause deteriorated insulation of
connectors or poor water resistance by the O-ring.
(3) Do not place any object on top of the sensor or on the top of the PH72 meter.
F0604.ai
Wetting cap
Protective cover
Attach wetting cap containing cotton
wad moistened with a few drops of
water.
For KCl refillable type sensor,
seal fill hole with plug.
Figure 6.4 Sensor Storage Condition
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Storage Location
When not in use, store the meter and sensor in a safe place. If it is to be stored for a
long period, store it in a place:
• With low humidity at or near normal temperatures
• Not exposed to direct sunlight or water
• No corrosive gases are present
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Replacing the O-ring and Gasket
A gasket in the battery box and an O-ring on the sensor connector of the meter can
be replaced. Heavily contaminated or damaged gasket and/or O-ring should be
replaced.
