GF Signet 2630 Amperometric Chlorine Electrode - Manual (Page 6)

6 263X Series Chlorine Electrodes
10. Troubleshooting
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 technical data
Membrane cap damaged Replace cap and recondition
DPD chemicals bad Use fresh reagents
pH outside of working range See technical 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 fl ow rate Check to make sure fl ow rate is suffi 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 technical 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 technical 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.