Draeger BG4 Iso Training 1/14
BG4 Sentinel System Testing
TEST PROCEDURE
Connect BG4 Sentinel System
and meter as per Fig A.
(The cooler is used as a
pressure dampener)
Slowly pump positive
pressure into the cooler.
The Sentinel should turn on
before the pressure reaches
1.4 mbar.
If fails: check battery, lines,
connections on switch box
and switch box.
Turn O2 cylinder ON and
read pressure on Sentinel.
Should be close to pressure
on cylinder gauge. (+ 250 psi)
Turn O2 cylinder OFF.
Service as required
Cooler
Switch
Box
x
Sentinel
PRESSURE
REDUCER
with BYPASS
OXYGEN
MINIMUM
VALVE
MP
RELIEF
VALVE
PRESSURE
TRANSDUCER
Pump Bulb
Positive Pressure
Fig A
Line used to
connect breathing
loop pressure to
switch box
Draeger Training 11/16 rev 1
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