43
463X Chlorine Systems Manual
Problem
Possible Causes
Remedies
Sensor cannot be calibrated.
Output is lower than DPD test.
Sensor conditioning time too short
Condition for 4 hours minimum prior to initial
calibration
Chlorine content too low
DPD value must be greater than
0.2
ppm to
calibrate
Low
fl
ow rate
Check to make sure
fl
ow rate is suf
fi
cient
Air bubbles on electrode membrane
Inspect visually. Tap to remove bubbles.
Mount at an angle
Low or no electrolyte in electrode
Fill electrode with electrolyte
Organic chlorination agents present in water
See Speci
fi
cations data
Surfactants in water
Remove surfactants and replace cap
Membrane cap coated
Clean or replace membrane cap
Membrane cap loose
Tighten or replace membrane cap
pH outside working range.
See Speci
fi
cations data
Sensor output very low
Electrode needs to be repolished
Polish gold electrode
Not enough electrolyte
Check electrolyte level
Sensor conditioning time too short
Condition for 4 hours minimum prior to initial
calibration
Chlorine content too low
Add chlorine to validate
Only bound chlorine present. No free chlorine Check for chloramine with appropriate DPD
test
Electrode not making good contact with
electronics
Inspect and reconnect
Unstable output from sensor
Electrode needs to be repolished
Polish gold electrode
Not enough electrolyte
Check electrolyte level
Air bubbles on electrode membrane
Inspect visually. Tap to remove bubbles.
Mount at an angle
Membrane damaged
Replace membrane. Condition sensor for at
least 2 hours and recalibrate.
Electrode not making good contact with
electronics
Inspect and reconnect
Non-sensor problem
Check 3-2650 Electronics connection
to electrode (see 3-2650 manual for
instructions). Make sure connections are dry.
Check instrument hookup
Transmitter error messages related to calibration are detailed in the Signet 8630 Chlorine Transmitter operation manual.
Problem
Possible Cause
Remedies
After completing calibration procedure,
the output values are inaccurate.
Insuf
fi
cient time allowed for electrode
stabilization during calibration.
Recalibrate, verify that test solutions are
at room temperature and wait at least 30
seconds after placing electrode in solution.
Transmitter Troubleshooting (see 8630-3 transmitter manual
: 3-8630.090-3
)
pH Electrode Troubleshooting (see 2724 electrode manual
: 3-2724.090
)
Troubleshooting - 2630 Free Chlorine Electrode
Troubleshooting - 2632 Chlorine Dioxide Electrode
Troubleshooting - 2750-7 pH Electronics
Appendix
