Maintenance; Patient Alert System; Routine Patient Maintenance; Periodic Homecare Provider Preventative Maintenance - DeVilbiss 525DS Service Manual

PATIENT ALERT SYSTEM

The DeVilbiss Oxygen Concentrator patient alert system will detect unit
component failure. This system is comprised of both visible and audible alerts
which signal the patient if a malfunction should occur.
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DeVilbiss OSD Operation
The OSD is a device within DeVilbiss concentrators that monitors the oxygen
produced by the unit. The OSD operates as follows:
• Normal Oxygen (green light) - oxygen purity normal
• Low Oxygen (yellow light) - oxygen purity low–requires servicing
NOTE–If the oxygen purity continues to fall, an audible signal will sound
intermittently. If the oxygen purity continues to fall to a low enough level, the
yellow "Low Oxygen" light will turn off and the red "Service" light will turn on.
NOTE–Refer to the Alerts section below for specific alert settings.
NOTE–After Power On, the OSD conducts a continuous diagnostic evaluation to
check for a fault in the piezo electronics. If this condition is detected by the OSD
electronics at any time during concentrator operation, the green "Normal
Oxygen" OSD light will turn off and the beeping audible alert and blinking red
"Service" light will activate. Otherwise for the first fifteen minutes of operation,
the green "Normal Oxygen" light will remain illuminated during the oxygen
stabilization process. After that time, the OSD will begin monitoring the oxygen
purity every second.
Alerts:
There are two visible service alerts located on the front panel.
For serial numbers starting with
J, N or R
Service
Low O 2 %
The audible alert system is internally powered; no batteries are required. If the
indicator lights illuminate or the audible alert sounds other than during start-up,
a problem has occurred
• Power Failure (Blinking red "Service" light and pulsing audible alert)
• Low Flow (Below 0.5 lpm) (Continuous red "Service" light and audible
alert)
• Below Normal Oxygen (84% to 75%, yellow "Low Oxygen" light. 75% to
60%, yellow "Low Oxygen" light and beeping audible alert. Less than 60%,
red "Service" light and beeping audible alert.)
The visible and audible alerts will activate for approximately 15 minutes in a no
power situation. If the unit is turned "On" without power or power is removed
later, no alert will sound for the first 10 seconds. After that time, the alert will
produce an audible pulse every few seconds while the visible alert blinks. Power
for this alert is provided by a capacitor on the PC board.
NOTE–If the concentrator has been unused for an extended period, the unit
must run several minutes before the power fail alert will activate.
The PC (printed circuit) board is responsible for controlling the system and
alerts.
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.
NOTE–Installation of 515LF-607 low output flow meter package will cause the
low flow alarm not to work.
M A I N T E N A N C E
For serial numbers starting with F
Low O 2 %
Service

ROUTINE PATIENT MAINTENANCE

DeVilbiss recommends using only original DeVilbiss parts and filters in order to
guarantee a reliable operation of the product.
The oxygen patient should perform the following maintenance:
Cannula, Tubing, and Humidifier Bottle
The patient should clean and replace the cannula, tubing, and humidifier bottle
according to the manufacturer's instructions.
Air Filter and Oxygen Outlet Connector
The air filter 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 outlet port.
2. Wash in a solution of warm water and dishwashing detergent.
3. Rinse thoroughly with warm tap water and towel dry. The filter should be
completely dry before reinstalling.
WARNING
Do not attempt to operate the unit without 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 bacteria
filter and cause a decrease in the unit performance.
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
Use only DeVilbiss concentrator replacement parts and accessories.
Every DeVilbiss Oxygen Concentrator is tested at the factory. To assure
continued trouble-free performance, the following preventative maintenance
should be performed by the homecare 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 #R217P62
or R218P12)—every 3 years.
a. Calibrate the oxygen analyzer prior to checking the oxygen
concentration. The analyzer should be properly calibrated 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.
b. Power the unit, set the flow meter to 5 LPM and connect the analyzer
to the unit's oxygen outlet port.
c. Wait 20 minutes for the display to stabilize. The concentrator must
operate for a minimum of 20 minutes before checking the oxygen
concentration.
d. Record the reading.
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LT-2023