palintest MICRO 500 Operating Instructions Manual page 19

Electrode Types
Different types of electrode are supplied with different Palintest
meters depending on the model. Electrodes may be of glass-bodied
or epoxy-bodied construction. Electrodes terminate in a BNC
connector. Older types have a screw type connector.
When ordering replacement electrodes it is important to specify the
model of pH meter, the type of electrode required and the type of
connection fitted.
Electrode Installation
1 Remove the protective bottle cap from the tip of the electrode and
retain for future use.
2 Remove any salt deposits which may have formed on the surface
of the electrode by thoroughly rinsing with deionised water.
3 Soak the electrode for one hour by dipping into Palintest
Electrode Storage Solution (PT 105/4/2). If this is not available
the electrode may be soaked in water to which a little potassium
chloride has been added.
deionised water.
4 Connect the electrode to the pH meter.
Electrode Calibration (Buffering)
All pH electrodes are inherently unstable over time and for this reason
it is essential to calibrate the electrode regularly against buffer
solutions of known pH value. The calibration procedure is described
in the instructions provided with the pH meter. The frequency of
calibration against pH buffers will depend on the nature of use and
the accuracy required.
calibrate the meter daily.
necessary to calibrate the meter each time it is used.
Palintest Buffer tablets provide a simple means of making up buffer
solutions for electrode calibration.
described on a separate leaflet (INST.7).
ORP electrodes provide a stable output and do not ordinarily require
recalibration before or during use. Note however that passivation and
poisoning of the electrode surface can result in a change of reading.
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Do not soak the electrode in
For most purposes it will be sufficient to
For highly accurate work it may be
The use of these tablets is
INST.21