O2 EII Pro
Technical Manual
Document ref: MO2-865-00
December 2015
Page 18 of 26
5
Quick Check
Symptom:
Condition:
Action:
‘L’ Symbol
Low Battery
Change Battery
No Display
Switched off
Bad connection
Switch on
Check Battery connection
Return to supplier
Zero Reading
Sensor disconnected
Sensor expired
No oxygen
Check connection
Change sensor
Check in air and ensure sensor saver is
removed
Reading erratic
Pressure on sensor
Radio transmission
Sensor
old
or
faulty
Condensation on sensor
Check flow
Move unit away
Change sensor
Dry sensor face
Reading does not
change
when
calibration knob is
turned
Reading held
Sensor failure
Faulty connections
Press on button to unfreeze
Change sensor
Return to supplier
Display segments
missing
Display faulty
Return to supplier
Will not calibrate
Sensor faulty
Sensor not in air
High altitude
Change sensor
Check EII Pro adaptor is fitted correctly
Please refer to website
Reading drifts
Rapid temperature change
Do not move analyser from one
temperature to another immediately
before use
