Aquaprobe
®
AP-700, AP-800 & AP-2000 Instruction Manual
10401-00870 Rev R
Troubleshooting Continued …
Problem
Cause / Remedy
pH and/or ORP readings
are slow, inaccurate or
unstable or calibration is
impossible.
The electrodes may need re-calibrating. Recalibrate.
The electrodes may need cleaning. Clean as described in the
relevant section of this manual.
The electrodes may have been allowed to dry out. Re-hydrate as
described in the relevant section of this manual.
The electrodes may be damaged. Replace the electrodes.
The electrode may be loose allowing water to enter the electrode
socket. Remove the electrode, blow out the socket with
compressed air then leave the probe and electrode in a warm
place for at least 48 hours to dry out.
EC readings are
inaccurate or unstable.
OUT OF CAL RANGE
error shows during
calibration of EC.
Have you got the Probe Sleeve fitted? EC will not work without
the Probe Sleeve fitted.
The Aquaprobe
®
may not be inserted deep enough into the
sample being measured. Ensure the sample level reaches the
minimum depth line on the outside of the Aquaprobe
®
.
Trapped air bubbles may be causing problems. Tap and swish the
Aquaprobe
®
to dislodge them.
The Probe Sleeve may be loose. The Probe Sleeve must be
absolutely rigid with respect to the Probe Body for correct EC
operation. If you can move the Probe Sleeve to and fro whilst
holding the Probe Body, tighten then recalibrate.
The EC electrode may need recalibrating. Recalibrate.
The EC electrode may be dirty. Clean the EC electrode then
recalibrate.
Turbidity readings are
inaccurate or unstable.
Have you got the Probe Sleeve and end cap fitted? Turbidity will
not work without the Probe Sleeve and end cap fitted.
Trapped air bubbles may be causing interference. Tap and swish
the Aquaprobe
®
to dislodge them.
The sample being measured may contain air bubbles. Under
these conditions, optical turbidity measurements can not be taken.
The Aquaprobe
®
may not be inserted deep enough into the
sample being measured. Ensure the sample level reaches the
minimum depth line on the outside of the Aquaprobe
®
.
The Probe Sleeve may be loose. The Probe Sleeve must be
absolutely rigid with respect to the Probe Body for correct turbidity
operation. If you can move the Probe Sleeve to and fro whilst
holding the Probe Body, tighten then recalibrate.
The Turbidity electrodes may need recalibrating. Recalibrate.
The lenses on the turbidity electrodes may be dirty. Clean the
lenses then recalibrate.
See
Appendix 7. Troubleshooting Turbidity.
Turbidity readings are
negative in clear water.
Erroneous zero point calibration caused either by contaminated
calibration solution or changes in the measurement chamber
between zeroing and deployment. Thoroughly clean the Probe
then re-zero in completely clean/clear water.
See
Appendix 7. Troubleshooting Turbidity.
21. DECLARATION OF CONFORMITY
Aquaread
®
Ltd declares that the equipment described herein is in compliance with the
essential requirements and other relevant provisions of Directives
2004/108/EC and
1999/5/EC.
© 2017 Aquaread
®
Ltd.
www.aquaread.com
Page 123 of 141
