GF Signet 4632 Chlorine Dioxide Analyzer System - Manual (Page 43)

43 463X Chlorine System Manual
Problem Possible Causes Remedies
Sensor cannot be calibrated.
Output is higher than DPD test
(out of range).
Sensor conditioning time too short
Condition for 4 hours minimum prior to initial
calibration
Interference from contaminants See Speci¿ cations data
Membrane cap damaged Replace cap and recondition
DPD chemicals bad Use fresh reagents
pH outside of working range See Speci¿ cations data
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 0.5 ppm to
calibrate
Low À ow rate Check to make sure À ow rate is suf¿ 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¿ 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¿ cations data
Sensor output very low
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
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¿ 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