PSS BG 4 Service Manual
Draeger Safety, Inc.
Checking the Drain Valve
1 Set “positive pressure pumping”.
2 Continue pumping until 10 mbar is indicated
on the pressure gauge.
While pumping:
3 Fit the open side of the sealing cap over the
tappet of the relief valve and hold it tightly until
it is pressed into place by the inflated
breathing bag.
4 The drain valve must not open at 10 mbar
(flow sounds still not audible).
The low-pressure warning generated by the Sentinel
during this test is irrelevant here.
Leak Test with Positive Pressure
1 Set “Leak test”
2 Press the button to reduce the pressure to
7 mbar.
3 Start the stopwatch.
The pressure must not change by more than
1 mbar during one minute.
1 Set “negative pressure pumping”. The
breathing bag is vented.
4 Remove the sealing cap.
The low-pressure warning generated by the Sentinel
during this test is irrelevant here.
Draeger Training 11/16 rev 1
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