Analytical Industries AII-2000 M Oxygen Analyzer - Manual (Page 16)

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Symptom Corrective Action
Reading displayed by LCD
drifts during calibration
Wait 5 minutes and repeat calibration with
sensor placed on flat surface (not in your
hand)
Check integrity of gas delivery system
Check sensor’s front o-ring seal
Verify calibration gas in not humidified
Remove moisture covering sensor
Replace sensor, repeat calibration
Analyzer reading climbs after
calibration in 100% dry oxy-
gen when exposed to air
20.9%
Allow the sensor to stabilize for 5 minutes in
100% dry oxygen and recalibrate
After calibration in 100% dry
oxygen, analyzer reading
drifts more than 2% over 8
hours
Check primary oxygen delivery device
Replace sensor that is nearing the end of its
useful life
Reading displayed by LCD
does not change when oxy-
gen level changes
Replace sensor
Reading does not stabilize or
fluctuates erratically
Relocate analyzer away source of radio fre-
quency or electromagnetic radiation emis-
sions. Tested over a 26 MHz to 1000 MHz
electromagnetic field, the analyzer is suscep-
tible at all frequencies tested except those
between 930 and 990 MHz.
Check sensor connection
Check cable connection
Wait 5 minutes and repeat calibration
Replace sensor, repeat calibration
Do not attempt to use the analyzer and
return the analyzer for service.
Symptom Corrective Action
Reading displayed by LCD
does not change when cali-
bration control is adjusted
Replace sensor
Reading displayed by LCD is
very low
Check sensor connection
Check cable connection
Replace sensor
Alarms continuously acti-
vated
None – Normal operation, confirm set points
Abnormal -
Adjust alarm set points
Remove moisture covering sensor
Check sensor connection
Check cable connection
Check integrity of gas delivery system
Check sensor’s front o-ring seal
Verify calibration gas in not humidified
Verify flow rate is 4-5 liters per minute
Replace sensor
Replace cable