En
gl
is
h (
G
B)
26
12. Maintenance
The device is maintenance-free.
Repairs can only be carried out in the factory by
authorized specialists.
13. Disposal
This product or parts of it must be disposed of in an
environmentally sound way. Use appropriate waste
collection services. If this is not possible, contact the
nearest Grundfos company or service workshop.
Conex
®
DIS-PR
Fault
Cause
Remedy
1.
Measured-value
display unsteady.
a)
Interferences on lines from
combination electrode to Conex
®
DIS.
Check the screen/cable and cable
routing.
b)
Distance between combination
electrode and Conex
®
DIS too
long.
Check the cables and replace, if
necessary. Position instrument max. 3
m away from combination electrode.
c)
Connection cables/plugs
between combination electrode
and Conex
®
DIS interrupted or
moist.
Check cables, and establish
connection. Possibly replace
combination electrode if water enters
the sensor head.
d)
Air pockets on the combination
electrodes for pH or redox.
Check supply of sample water and
modify, if necessary.
e)
Combination electrode faulty.
Replace the combination electrode.
2.
Display at full-scale
value.
a)
Connection cable between
combination electrode and
Conex
®
DIS interrupted.
Check the cable, and establish
connection.
b)
Combination electrode faulty.
Replace the combination electrode.
3.
With pH
measurement, the
display is constantly
approx. pH 7.00, and
with redox
measurement 0 mV.
a)
Short-circuit in connection cable
between electrode and Conex
®
DIS, moisture in the plug
connectors.
Check cables, and eliminate
short-circuit. Eliminate moisture or
replace cables.
b)
Combination electrode faulty.
Replace the combination electrode.
4.
Fault during or after
calibration.
a)
Combination electrode
contaminated, too old or faulty.
Clean the combination electrode
according to supplied description, or
replace.
b)
Used buffer solutions too old.
Renew the buffer solutions.
5.
Measured-value
display has sluggish
response.
a)
Combination electrode
contaminated.
Clean the combination electrode
according to supplied description.
b)
Combination electrode too old.
Replace the combination electrode, if
necessary.
Note
If faults in the measurement: Refer to the
installation and operating instructions of
the respective electrode or measuring cell.