PRO
2
check
®
Ultrasonic Oxygen Indicator
Trouble Shooting Checklist
Complaint
Probable Cause
Suggested
Corrective Action
Display is
blank
when
unit is turned on.
Bad batteries.
Corroded battery
terminals.
Replace batteries.
Clean battery terminals.
When unit is turned on
display flashes
"PRO O2 @ CAL"
and then turns off.
Unit requires
calibration.
Perform "Full
Calibration Procedure"
outlined in Operation
Manual.
Display reads
91.8%
on
a source of U.S.P.
oxygen (> 99.0%).
Unit is operating in
mode to check
concentrators and is
adjusting for
concentrator's output
of argon.
With unit still connected to
source of U.S.P. oxygen (>
99.0%) push
and continue to hold
down
“
pure
O
2
/calibrate
”
button to
temporarily remove argon
correction from unit's
With unit still connected to
source of U.S.P. oxygen (>
Display reads between
98% to 102%
(but not
99.9%) on a source of
U.S.P. oxygen
(> 99.0%) with button
held down.
Unit requires quick
calibration.
99.0%) push and hold
down
“
pure O
2
/
calibrate
”
button until
display reads 99.9% - 101
(approximately 20
seconds). The unit is then
recalibrated.
Unit is out of 98% to
102% range after quick
calibration.
Unit requires full
calibration.
Perform "Full
Calibration Procedure"
outlined in User Manual.
"---"
appears on display
while unit is being
calibrated.
Incomplete
calibration.
Release the
"
pure
O /calibrate
"
button
2
and restart calibration
process.
Display shows
"-U-"
.
Indicates an out of
range reading.
Perform "Full Calibration
Procedure" outlined in
User Manual.
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