16.2 pH and mV Troubleshooting
Symptom Possible Causes Remedy
Unit fails to
calibrate, even with
new probe.
Calibration settings outside of
allowable limits due to previous
failed calibration.
Initialize the unit. See section
15, Initialising the WP-80.
1 Point calibration
fails (Asymmetry is
greater than +/-1.00
pH).
1. Reference junction blocked.
2. Reference electrolyte
contaminated.
Clean reference junction, as per
instructions supplied with the
electrode.
Flush with distilled water and
replace electrolyte.
2 Point calibration
fails (Slope is less
than 85.0%).
1. Incorrect primary buffer.
2. Glass bulb not clean.
3. Electrode is aged.
4. Connector is damp.
5. Buffers are inaccurate.
Ensure that you are using the
buffers which the WP-80 has
been set to automatically
recognise (see section 14).
Clean glass bulb as per
instructions supplied with the
electrode.
Attempt rejuvenation, as per
instructions supplied with the
electrode. If not successful,
replace electrode.
Dry in a warm place.
Replace buffers.
Unstable readings. 1. Electrolyte chamber needs
to be refilled.
2. Reference junction blocked.
3. Glass bulb not clean.
4. Bubble in glass bulb.
5. Faulty connection to meter.
6. Reference junction not
immersed.
7. KCl crystals around
reference junction, inside
the electrolyte chamber.
Refill with saturated KCl filling
solution.
Clean reference junction, as per
instructions supplied with the
electrode.
Clean glass bulb as per
instructions supplied with the
electrode.
Flick the electrode to remove
bubble.
Check connectors. Replace if
necessary.
Ensure that the bulb AND the
reference junction are fully
immersed.
Rinse electrolyte chamber with
warm distilled water until
dissolved. Replace electrolyte.
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