YSI 5239 Dissolved Oxygen Probe - Manual (Page 16)

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Stick the disc to the sanding tool, then wet sand the gold with
a twisting motion about 3 times or until all silver deposits are
removed and the gold appears to have a matte finish. If the
cathode remains tarnished, return the probe for service.
Wipe the gold cathode thoroughly with a wet paper towel
before putting on a new membrane cap.
T ROUBLE S HOOTING G UIDE
Below is a quick reference of symptoms with steps to follow
to cure these symptoms.
Symptoms Actions
Unable to calibrate • Extend the stabilization time from 15 min.
to 30 min. before calibrating
• Change membrane
• Check for loose or wrinkled membrane or
deposits between gold cathode and
membrane, especially after changing
membrane
• Clean probe (see instructions under
Electrode Cleaning)