WT.050.560.001.UA.IM.0714
104
Depolox
®
3 plus ReSIDUAl ANAlYZeR
eVoQUA
W3T140188
4.2.2
Troubleshooting
The following troubleshooting table is provided for determining and correcting
most common troubles.
Table 4.3 - Troubleshooting - Free Chlorine (Bare Electrode) Sensor Kit
FAULT CONDITION
POSSIBLE CAUSE
CORRECTIVE ACTION
Insufficient sample water flow drain hose free fall restricted
Ensure 1500mm free fall
dirt in cell unit
clean cell
air bubbles
check lines
blocked strainer
clean strainer
shut-off valve closed
open
regulating valve not working cor-
rectly
strip and clean regulator
Air leaks
faulty o-rings
grease or replace
faulty pipe connections
check and make good where needed
booster
check and make good where needed
Electrode current too low
dirty electrodes
clean with fine sand paper, add more
grit
worn electrodes
replace
electrodes touching
adjust
Unsteady output from elec-
trodes
membrane clogged
replace
air bubbles on inner surface of
membrane
adjust
Zero or span not adjustable
zero current too high or too low
wait until 24-hour running-in period is
completed
measure the electrode voltage across
terminals 30 and 31 and adjust Upot
to 0.25V. Zero current must be <±5µA
shut-off valve not closed at zero cali-
bration
cell current too low or too high
check µA-range
increase sample water flow
see also “Electrode current too low,”
above
Indicated value oscillates con-
siderably at constant chlorine
concentration
considerable fluctuations in water
pressure
check pressure
fluctuation in pH value
check pH value
inlet to cell body or flow regulator
clogged
clean inlet or flow regulator
flow regulator defective
check or replace
Summary of Contents for Wallace & Tiernan Depolox 3 plus
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