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PRODUCT INSTRUCTION SHEET
SECTION 10.0
SENSOR MAINTENANCE/RECONDITIONING
10.1 GENERAL MAINTENANCE. Service the sensor regularly
(weekly is suggested)
10.2 MEMBRANE CAP REPLACEMENT. If membrane replace-
ment is required, a new cap with preinstalled membrane must
be used. Order FCLA-2016 replacement membrane cap and
FCLA-2015 refill solution. To change membrane cap (do the
following over a sink or washbasin):
a) turn sensor upside down with cap facing upward
b) rotate cap counter-clockwise to remove (see FIG 10).
c) fill sensor body with electrolyte using needle and bottle of
refill solution (see FIG. 11)
d) install a new membrane cap by threading cap onto sensor
rotating cap clockwise (opposite of FIG 10)
10.3 MEMBRANE CAP/SENSOR CLEANING. Rinse cap with
water only. If cap does not clean, replace with new one.
SECTION 11.0
SENSOR TROUBLESHOOTING
11.1 CALIBRATION PROBLEMS
a) Sensor output HIGHER than DPD test
1) Run in time too short
2) Membrane cap damaged
3) Interference from water
contaminants (see Specifications,
"Cross Sensitivity")
4) Cable short circuit or damage
5) pH value less than pH 5.5
b) Sensor output LOWER than DPD test
1) Run in time too short
2) Deposits on Membrane cap
3) Flow rate too low
4) Air bubbles on membrane
5) Surfactants in water
6) pH value more than pH 8.0
7) No electrolyte in membrane cap
c) Sensor ouput is 4mA (zero ppm)
1) Run in time too short
2) Only bound chlorine present
3) Chlorine content below detection
limit
4) Sensor not wired correctly (See
SECTION 6.0 of this manual)
5) Defective sensor
d) Sensor output UNSTABLE
1) Air bubbles on membrane
2) Membrane damage
3) Non-sensor problem
Parts covered by this product instruction sheet include: FCLTX-100 Series
FIG. 10
FIG. 11
TROUBLESHOOTING CHART
Symptom
Possible Cause
The sensor
1) Run in time too short
cannot be
2) Membrane cap damaged
calibrated-
3) Interference from contaminants
ouput is
4) DPD chemicals bad
HIGHER than
5) pH value < pH 5.5
DPD Test
6)Temperatue increased since cal
The sensor
1) Run in time too short
cannot be
2) Deposits on membrane cap
calibrated-
output is
3) Flow rate too low
LOWER than
DPD Test
4) Air bubbles on membrane
5) Surfactants in water
6) pH > pH 8.0
7) No electrolyte in cap
8) Temperature decreased since cal 8) Increase temp to match cal
9) Organic chlorination agents
present in water
Sensor output
1) Only bound chlorine present
is 4mA (0 ppm)
NO FREE CHLORINE
2) Run in time too short
3) Chlorine content below limit
4) No electrolyte in cap
5) Sensor electrical connection
wrong
Unstable output
1) Air bubbles on sensor membrane 1) Tap to remove bubbles
from sensor
2) Membrane damaged
3) Non-sensor problem
INJECT UNTIL SOLUTION
LEAKS OUT OF FILL HOLE
Solution/Remedy
1) See Sec 5.0 -CONDITIONING
2) Replace cap - See Sec 8.0
3) See SPECIFICATIONS
4) Use new DPD kit
5) Increase pH (5.5-8.0)
See SPECIFICATIONS
6) Match calibration temp.
1) See Sec 7.0 -CONDITIONING
2) Remove deposits or replace
cap if cleaning ineffective.
3) increase fl ow - See
SPECIFICATIONS
4) Remove and re-install sen
sor to remove bubbles.
5) Remove surfactants and
replace cap
6) Lower pH (5.5-8.0)
See SPECIFICATIONS
7) Add new electrolyte, run in
sensor and re-calibrate
9) Use chlorinating agents
per DIN 19643
1) Check for Chloramine with
appropriate DPD test.
Replace water/ Rechlorinate.
2) See Sec 7.0 -CONDITIONING
3) Add chlorine and repeat
calibration
4) Refi ll electrolyte
5) See SECTION 6.0
2) Replace membrane, run in
sensor and recalibrate.
3) check PLC or I/O device
M4679/0708 page 5 of 6
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