18.4 Error messages and warning alerts
18.4.1 Error messages
Tab. 23: Error messages
Error Error message text Cause Remedy
01 The mV input
voltage is too low.
Coaxial cable connec‐
tion disconnected.
Check that the coaxial cable connec‐
tion is fitted correctly and re-connect.
Check the coaxial cable connection for
corrosion and moisture and replace
with a new cable, if necessary.
pH/ORP sensor is
faulty
Replace the sensor.
02 The mV input
voltage is too high.
The connected signal
does not come from a
pH sensor.
A disturbance signal is
picked up.
Check the origin of the sensor signal.
Check the raw signal by pressing .
The sensor raw value is shown here in
mV. If the value with pH is greater than
± 500 mV, or with ORP is greater ±
1500 mV, then these are wrong sensor
values. Check once again the cabling
and origin of the sensor signal. Ensure
that the measuring lines are not laid
parallel to power cables.
03 The temperature is
too low.
Incorrect sensor con‐
nected.
Check the type of sensor connected.
Only Pt 100 and Pt 1000 sensors work.
04 The temperature is
too high.
No sensor or incorrect
sensor connected.
Check the sensor connection
Check the type of sensor connected.
Only Pt 100 and Pt 1000 sensors work.
05 A calibration error is
pending.
With amperometric
analysis (e.g. chlorine):
The calculated refer‐
ence value deviates
too much from the real
value or the sensor
value.
With amperometric analysis (e.g.
chlorine): Check the correctness of the
reference method, e.g. DPD1.
With pH and ORP: the
buffers used differ from
the nominal value, are
outdated or watered
down.
With pH and ORP: replace the buffer
with new buffer.
[Diagnostics]
167
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