Dräger PSS BG 4 RP, Instructions For Use Manual

Page: 54 / 78

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Use en
15. Press the connecting piece into the connecting piece on the
facepiece until it engages.
16. Immediately after the connecting piece engages, open the
cylinder valve by at least two rotations and breathe out into the
closed-circuit breathing apparatus.
The Bodyguard powers on automatically and runs a self-test
(see chapter 4.8 on page 69).
17. Use the display on the Bodyguard to check that there is
adequate oxygen for the usage period in the cylinder.
18. Tightly squeeze the inhalation hose and breathe in until a
vacuum is produced in the mask. Hold your breath for about
10 seconds. The vacuum must be maintained; if it is not, the
harness on the full face mask must be re-tightened.
19. Press the left button on the Bodyguard briefly to check
the scale illumination. It goes out automatically after a short
time.
When the closed-circuit breathing apparatus is OK, the green
LED flashes and the operating mode display is shown.
The apparatus can now be used.
In the event of an error, the red LEDs flash and an alarm tone
sounds.
3.4 During use
3.4.1 General instructions for use
The closed-circuit breathing apparatus works fully
automatically. Absorption of the CO
2
generates heat which can
be felt, particularly when working under aggravated conditions
with intense breathing. This is perfectly normal and indicates
that the apparatus is functioning correctly.
Always set out in groups with at least two people wearing
the apparatus. Check the oxygen supply approx. every 10 to
15 minutes.
The period of service and retreat should be planned
independently of the low pressure warnings. When the 55 bar
residual pressure warning sounds, begin retreat. When the low
pressure warning sounds, cease usage immediately.

When the backlight is required, briefly press the left button
on the Bodyguard.
The backlight is switched on for 5 seconds.

When the ambient temperature is to be displayed, press
the right button on the Bodyguard briefly.
Instead of the remaining period of use, the temperature is
displayed in °C. The display changes back automatically to
the remaining period of use.
3.4.2 In an emergency

Press the yellow panic button.
The main alarm sounds, the function key symbol is displayed
(see chapter 2.6 on page 44) and the red LEDs flash.

In the event of a functional fault in the oxygen supply
press the bypass valve briefly.
Additional oxygen is supplied to the breathing circuit.
3.4.3 Switching off Bodyguard alarms
Switch off all alarms, with the exception of the pre-alarm,
as follows:

Press the right and left buttons on the Bodyguard simulta-
neously until the alarm stops. The Bodyguard goes back to
normal operating mode and the operating mode display is
shown once again.
WARNING
If a warning signal sounds, the cylinder valve is closed
or the compressed oxygen cylinder is empty.
If the warning signal continues to sound after the
cylinder valve is opened, the closed-circuit breathing
apparatus is not permitted to be used as no oxygen is
being supplied to the circuit. In this case, there is a risk
of a health hazard due to insufficient oxygen supply.
NOTICE
To ensure that the maximum usage period can be
achieved, the compressed oxygen cylinder must have
a charging pressure of at least 180 bar.
WARNING
If an error has occurred, the closed-circuit breathing
apparatus must not be used. The closed-circuit
breathing apparatus must be returned to Dräger or
repaired by trained personnel.
Failure to follow this warning could lead to death or
serious injury.
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CAUTION
If the closed-circuit breathing apparatus needs to be
taken off the back in confined spaces, e.g. when
entering an emergency shaft, kinks in the corrugated
hose may cause increased breathing resistance.
Removing the closed-circuit breathing apparatus and
pushing it ahead should therefore be practised
thoroughly to avoid problems in the form of interrupted
breathing.
WARNING
In the event of faults in the closed-circuit breathing
apparatus begin the retreat immediately.
Failure to follow this warning could lead to death or
serious injury.
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