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Section 5 Troubleshooting
5.1 Oxygen sensor
Problem
Sensor won't calibrate, even after
cleaning and/or membrane
change.
"0000" O
levels displayed.
2
Shorter than expected sensor
operation in relatively high
dissolved O
concentration.
2
Unexpected or inaccurate
dissolved O
readings.
2
28 English
Probable cause
Instrument internal
barometric pressure
sensor needs calibration.
Wet membrane
interface.
"H
S insensitivity" option
2
enabled.
Wrong reading scale
"XXXX" selected for
display unit.
High O
concentrations
2
generate deposits more
quickly.
Air leak on product
sample line.
High residual current.
Possible solution
Calibrate using a certified barometer. Do not
correct for sea level !
Wipe dry with a tissue and re-calibrate.
Disable from the menu on the measuring
instrument.
Change reading scale by selecting "X.XXX, XX.XX
or XXX.X" on the instrument.
Install a less permeable membrane.
Turn off the analyzer when sensor is not in a low
O
concentration.
2
Set flow rate to 100 mL/min. Wait until stable, then
slowly double the flow rate.
The stable value of dissolved O
the same as before. A variation related to flow rate
is a clear sign of an air leak in the line.
Place sensor in de-aerated sample and wait for
low reading.
Check concentration against low measurement
limit (refer to
Sensor membrane specifications
on page 4).
If concentration is significantly higher than low
limit, try replacing the membrane.
reading must be
2
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