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Patient Alert System
The DeVilbiss Concentrator patient alert system will detect unit component failure as well as restricted flow situations. This system
is comprised of both visible and audible alarms which signal the patient if a malfunction should occur.
The diagnostic lights on the PC board will help service personnel diagnose the cause of the malfunction.
The visible alarm located on the front panel 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
such as:
•
low/high pressure
•
minimum/maximum cycle
•
valve failure
•
bed failure
•
compressor failure
•
restricted flow (blinking visible alarm and pulsing audible alarm)
•
power fail (blinking visible alarm and pulsing audible alarm)
The visible and audible alarms will activate for approximately 20 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 20 minutes before the power fail alarm will
become operational.
The printed circuit (PC) board is responsible for monitoring and controlling the entire system as well as the alarms by using a pressure
transducer.When the pressure sensed by the pressure transducer indicates a malfunction, the patient alert system will activate regard-
less if it is a pressure or component failure.Alarms will also be activated if the system fails to operate within the preset minimum and
maximum cycle times.The alarm system cannot be overridden. Most major malfunctions will shut the unit off automatically, preventing
any further damage to the unit.
Diagnostic System
The PC board has three red diagnostic lights, labeled D17, D16, and D18. Should a unit malfunction occur, the unit will shut off, and
these lights will illuminate in a particular sequence.The diagnostic lights should be used as a troubleshooting aid, in conjunction with
the pressure-vacuum gauges, because there may be more than one reason for a malfunction.
Oxygen sensor
assembly
(OSD units only)
Green four-way
and purge
indicator lights
P A T I E N T A L E R T & D I A G N O S T I C S Y S T E M
Diagnostic lights (on back of PC board)
PC Board
15
Figure 15
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Table of Contents
Troubleshooting
