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Blender
Air-Oxygen
TROUBLESHOOTING
If the Air-Oxygen Blender fails to function, consult the
Troubleshooting Guide below.
If problem cannot be solved by using Troubleshooting Guide
refer to the Air-Oxygen Blender Service Manual (P/N 504827)
available on the Internet; www.precisionmedical.com or consult
your Provider.
Problem Probable Cause Remedy
Oxygen
concentration
discrepancy
between Blender
setting and
Analyzer/Monitor
(greater than 3%)
1. High Flow model,
flow requirement
below 15 lpm.
Low Flow model,
flow requirement
below 3 lpm.
2. Analyzer/Monitor
inaccurate
3. Low flow bleed
obstructed
4. Gas supply
contaminated
5. Downstream device
causing back flow
or restricted flow
1. Use auxiliary outlet
& engage bleed
2. Recalibrate
Analyzer/Monitor or
Verify with second
Analyzer/Monitor
3. Remove obstruction
4. Check gas sources
with calibrated
Oxygen Analyzer/
Monitor to
confirm
Oxygen is 100% and
Air is 21%
5. Isolate Blender.
Check oxygen
concentration at
Blender Outlets
No flow at
Blender outlets
1. Gas sources turned
“OFF”
2. Gas sources not
connected
1. Turn gas sources
“ON”
2. Connect gas
sources
Alarm sounding 1. Difference between
Oxygen and air inlet
pressures greater
than specified
1. Correct pressure
difference until
Air and Oxygen
pressures are within
specification