Troubleshooting Guide 160
26. TROUBLESHOOTING GUIDE
Symptom Problem Solution
Slow response /
Excessive drift
Dirty pH electrode
Soak the tip in HI7061 Electrode
cleaning solution for 30 minutes and
then follow the pH cleaning procedure.
Dirty EC probe
Remove and clean the sleeve.
Make sure the rings on the probe
are clean.
Dirty DO probe
Remove the cap. Inspect, and clean or
replace, if necessary.
Reading fluctuates
up and down (noise)
Clogged/dirty pH electrode junction. Clean the electrode.
EC probe sleeve not properly
inserted; air bubbles inside sleeve.
Make sure the sleeve is correctly placed.
Tap the probe to remove air bubbles.
DO probe electrolyte
contains air bubbles
Remove the cap. Refill, tap and reinstall.
Controller fails to calibrate
(or gives faulty readings)
Broken probe Replace the probe.
Display shows the
reading blinking
Dry membrane (or junction)
Soak electrode in HI70300 Storage
solution for at least 30 minutes.
EC reading is out of range
Remove and clean the sleeve.
Make sure the rings on the probe
are clean.
DO reading is out of range
Remove the cap. Inspect, and clean or
replace, if necessary.
Stir or increase the flow rate.
Error messages displayed
during calibration
Wrong (contaminated) buffer or
standard solution
Dirty (broken) probe
Check that calibration solution is correct
and fresh.
Check the probe.
Note: ORP electrodes: gently polish the metal tip with a lightly abrasive paper, paying attention not to scratch
the surface. Follow with a thorough wash.
Note: It is recommended to keep at least one spare electrode handy. When problems are not resolved with a
simple maintenance procedure, change the probe and recalibrate.
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