Xylem DO600 Dissolved Oxygen Meter - Manual (Page 9)

DO600 - Version 5.0 8/05 9
Appendices
Troubleshooting Guide
Symptom Possible Causes Action
Unit will not power on -Batteries not in place
-Dead batteries
-Battery polarity incorrect -Replace Batteries
-Replace Batteries
-Reorient/Replace Batteries
“BAT” indicator shown on display -Batteries are weak -Replace Batteries
Unstable Readings -Insufficient electrolyte in probe (Air
bubbles present when probe is
inverted.)
-Electrolyte is depleted -Replace electrolyte, and
membrane cap assembly.
Readings drift down -Insufficient stirring (the probe
consumes oxygen at the measuring
surface, requiring constant sample
movement across membrane) -Move probe in sample or stir
sample
Slow Response -Dirty or damaged membrane -Replace electrolyte and
membrane cap
Electrode cannot be calibrated -Depleted electrolyte
-Dirty or damaged membrane -Replace electrolyte and
membrane cap
Electrode cannot be calibrated
after replacing the electrolyte and
membrane cap -Dirty probe (Cathode is not a shiny
gold color) -Clean cathode with cleaning
paper
Sample reading is frozen -Unit is in “HOLD” mode
-Unit is locked -Release HOLD (momentarilly
press Mode/Hold button)
-Remove batteries, press
ON/OFF button, replace batteries
and restart