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Macro 900 Operation Manual
V3
13. pH/ORP Electrode Calibration and Maintenance
13.1. Recognising the pH/ORP Electrode
The combined pH/ORP electrode is easy to recognise because it is the only
electrode that is not black. This electrode has a clear, gel filled body.
13.2. Electrode Removal and Replacement
The pH/ORP electrode can be unscrewed from the Probe body by rotating it
anti-clockwise. When replacing an electrode, apply a little silicone grease or
similar lubricant to the thread and O ring, then screw fully in.
Gripping the black collar at the top of the electrode, tighten until the O ring is
fully compressed. Do not twist the clear section of the electrode whilst
tightening.
Useful Tip: The quick release lanyard that is attached to the pH/ORP storage
cap makes a very useful belt wrench for tightening and loosening the pH/ORP
and AUX electrodes.
Slide the lanyard over the electrode and use it to grip the knurled body.
Never immerse an MAP 2000/2100 with the pH/ORP electrode removed. This
will cause serious damage to the electrode socket. This is not covered by
your warranty.
13.3. Keeping the Electrodes Moist
It is very important that the pH/ORP electrode is kept moist when not in use.
This is achieved by always fitting the storage cap, which incorporates a sponge
that should be soaked in a special storage solution.
The sponge within the storage cap should be moistened with a few
drops of pH Electrode Storage Solution each time it is removed and
replaced. If a pH/ORP electrode is inadvertently allowed to dry out, it must be
re-hydrated by soaking in storage solution for at least one hour prior to use.
13.4. Calibrating pH
pH electrodes should be calibrated fully at least once a week to ensure optimum
accuracy. Full calibration involves calibrating at pH 7.00 first, then at pH 4.01
and/or pH 10.00. The MAP 2000/2100 allows for both two and three point pH
calibration. Should you decide to carry out just a two point calibration, the
probe will automatically calculate and save a calibration value for the
uncalibrated third point in order to maintain the electrode's linearity over the
full range of 0 – 14.
For best results, calibrate all three points as close to 25°C as possible.
© 2013 Palintest Ltd.
www.palintest.com
Page 36 of 147
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