15
❺ Troubleshooti ng
• If a problem occurs, before you contact your retailer, please carry out these few simple checks
using the following tables.
• If the problem conti nues, contact your retailer.
•
: Acti ons to be performed by a qualifi ed technician only
5.1 I Appliance behaviour
Behaviour
Possible causes
Soluti ons
The value displayed
on the appliance is
frozen at about 7.0 pH
•
Cable problem and/or BNC
connector problem
•
Check that the connecti on between the
sensor and the control box has not short cir-
cuited (between the cable's central core and the
external shielding)
•
Check that there is no dampness and/or
condensati on on the BNC socket
The appliance always
displays an unsuitable
or constantly unstable
value
•
The pH sensor connecti on
cable is damaged
•
Check the cable and/or the BNC connector
•
The pH sensor cable is too
close to an electric cable lead-
ing to interference
•
Reduce the distance between the appliance
and the sensor
• There is an air bubble in
the pH sensor bulb
•
Put the pH sensor in the verti cal positi on
and shake it gently so that the air bubble rises
to the top (it must be mounted in the verti cal
positi on or ti lted to 45° maximum, see §"2.2.1
Sensor and injecti on point locati on")
•
Problem on sensor's porous
coati ng and/or dirt deposits
•
Restart calibrati on
•
Check that the pH sensor bulb is not
damaged and that it did not dry outside the
water
•
As a last resort, clean it by dipping the
sensor in a 10% hydrochloric acid soluti on for a
few hours
•
The sensor is not correctly
fi tt ed on the piping
•
Place the sensor in a more suitable locati on
(see §"2.2.1 Sensor and injecti on point loca-
ti on")
Slow response from
the pH sensor
•
The pH sensor is electro-
stati cally charged
• Rinse the sensor with clean water
•
Do not wipe the sensor with a cloth or
paper, shake it gently
EN
