8
MAINTENANCE
PATIENT ALERT SYSTEM
The DeVilbiss Oxygen Concentrator patient alert
system will detect unit component failure.This system is com-
prised of both visible and audible alarms which signal the patient
if a malfunction should occur.
The visible alarm located on the front panel (Figure
1) reads
“Service Required.” The audible alarm system is internally
powered; no batteries are required.When the indicator lights
illuminate or the audible alarm sounds, other than during unit
start-up, a problem has occurred.
Non-OSD and early-OSD models:
• Power Failure (Blinking red “Service Required” light
and pulsing audible alarm)
• Low Pressure (Continuous red “Service Required” light and
audible alarm)
• Below Normal Oxygen - OSD models only (Less than 85%,
yellow “Low Oxygen” light. Less than 75%, yellow “Low
Oxygen” light and audible alarm)
Later OSD models:
• Power Failure (Blinking red “Service Required” light
and pulsing audible alarm)
• Low Flow (Below 0.5 lpm) (Continuous red “Service
Required” light and audible alarm)
• Below Normal Oxygen (83.5% to 75%, yellow “Low Oxygen”
light. 75% to 60%, yellow “Low Oxygen” light and beeping audi-
ble alarm. Less than 60%, red “Service Required” light and
beeping audible alarm.)
The visible and audible alarms will activate for approximately
15 minutes in a no power situation. If the unit is turned “On”
and later the power is removed, no alarm will sound for the
first
10 seconds.After that time, the alarm will produce an
audible pulse every few seconds while the visible alarm blinks.
NOTE: If the concentrator has been unused for an extended
period, the unit must run several minutes before the power
fail alarm will activate.
The printed circuit (PC) board (Figure 5) is responsible for
controlling the system and alarms.
NOTE: A high pressure condition is indicated by the audible
(a “popping” sound) release of pressure from a pressure relief
valve located on the compressor head.
ROUTINE PATIENT MAINTENANCE
The oxygen patient should perform the following maintenance:
Oxygen Humidifier (reusable bottles only)
The patient should clean the humidifier bottle daily.The
patient should follow the instructions supplied by the manufac-
turer. If no cleaning instructions were supplied, these steps
should be followed:
• Wash the humidifier bottle in a solution of hot water and
dishwashing detergent.
• Soak the humidifier in a solution of one part white vinegar to
three parts hot water for 30-45 minutes.This solution acts as
a germicidal agent.
• Rinse thoroughly with hot tap water and refill with distilled
water for use. Do not overfill.
Cannula/Mask and Tubing
The patient should clean and replace the cannula or mask and
tubing as instructed by the manufacturer.
Air Filter and Oxygen Outlet Connector
The air filter (Figure 3) and oxygen outlet connector should
be cleaned at least once a week by the patient.To clean, these
steps should be followed:
1. Remove the air filter located in the door on the back of the unit.
Remove the oxygen outlet connector (if used) from oxygen out-
let port (Figure
1).
2. Wash in a solution of warm water and dishwashing detergent.
3. Rinse thoroughly with warm tap water and towel dry.The fil-
ter should be completely dry before reinstalling.
WARNING: Do not attempt to operate the unit with-
out the air filter or while the filter is still damp.
NOTE:
The air filter should be monitored more closely in
environments with abnormal amounts of dust and lint.
CAUTION: Operation of the DeVilbiss Oxygen
Concentrator in extreme environments or without
the air filter will prematurely occlude the intake bac-
teria filter and cause a decrease in the unit perfor-
mance.
Exterior Cabinet
The patient should clean the concentrator exterior cabinet by
using a damp cloth or sponge with a mild household cleaner
and wiping it dry.
WARNING: Do not apply liquids directly to the
cabinet or utilize any petroleum-based solvents or
cleaning agents.
PERIODIC HOMECARE PROVIDER
PREVENTATIVE MAINTENANCE
Every DeVilbiss Oxygen Concentrator is tested at the factory.
To assure continued trouble-free performance, the following
preventative maintenance should be performed by the home-
care provider during periodic oxygen patient visits. Failure to
properly maintain the unit will void the warranty.
1. Check the oxygen concentration with an oxygen analyzer
(part #O2ANA)—every 3 months on non-OSD units or every
two years on OSD units.
a. Calibrate the oxygen analyzer prior to checking the oxy-
gen concentration.The analyzer should be properly cali-
brated using the manufacturer’s recommended procedure.
NOTE: Changes in temperature, altitude, or humidity may
affect the analyzer’s oxygen concentration reading.The
analyzer should be calibrated in similar conditions to the
location of the concentrator.
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