PSS BG 4 Service Manual
Draeger Safety, Inc.
Checking the Battery Capacity
On activation and deactivation the Sentinel automati-
cally checks and displays the battery capacity. There
are three icons used to represent the capacity left in
the battery.
Symbol “Battery OK”
Battery does not need to be replaced.
Symbol “Battery warning 1”
On power up a long beep (acoustic alarm) will sound
and the display will show “Battery warning 1” icon.
When this icon is first displayed, it is acceptable to
safely use the PSS BG 4 for up to 4 hours (under
standard Sentinel operation).
NOTE
When the first limit is reached, replace the battery
immediately.
Symbol “Battery warning 2”
– In this case the red LEDs flash constantly. On
Power up 5 short beeps will sound and the display
will show the “Battery warning 2” icon.
Sentinel automatically powers off and blocks any
further operation.
CAUTION!
If a battery warning 2 is displayed, the battery
must be replaced before any new operation.
Failure to follow this warning could lead to death
or serious injury.
Releasing Air from the Breathing
Circuit
• Remove the plug-in coupling from the RZ 25
test adapter and wait until Sentinel shows the
zero pressure.
• Replace the sealing cap R33588 on the plug-
in coupling.
Draeger Training 11/16 rev 1
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