Description
Instructions for use
|
Dräger BG ProAir
7
3.2 Functional
description
3.2.1 Closed-circuit breathing apparatus
The closed-circuit breathing apparatus is a positive-pressure-
operated self-contained closed-circuit breathing apparatus. A
positive pressure in the breathing circuit prevents ambient air
from entering the system.
The breathing air is circulated in a closed breathing circuit.
The carbon dioxide contained in the exhaled air is absorbed in
a CO
2
absorber. The following absorber types are available:
– Disposable absorber
– Refill absorber
– Training absorber
Every CO
2
absorber has an RFID tag. An RFID reader in the
onboard electronics detects the type of absorber installed in
the closed-circuit breathing apparatus and how long the CO
2
absorber has already been installed in the closed-circuit
breathing apparatus. This RFID feature is optional and can be
activated in the Connect ECU.
The breathing air streams from the CO
2
absorber into the
breathing bag.
The breathing air is enriched with oxygen from the
compressed oxygen cylinder. The following apparatus
versions are available:
– Apparatus with constant oxygen dosage
– Apparatus with on-demand oxygen dosage
Apparatuses with constant oxygen dosage use the constant
dosage device to continuously supply a constant volume of
oxygen to the breathing circuit. In the event of greater
breathing intensity, the additional oxygen required is supplied
in the breathing circuit via the minimum valve.
Apparatuses with on-demand oxygen dosage have an
automatic pre-flush unit. The pre-flush unit ensures that
adequate oxygen is supplied in the breathing circuit when the
compressed oxygen cylinder is opened at the start of an
incident. During the incident, additional oxygen is supplied in
the breathing circuit via the minimum valve in accordance with
breathing intensity.
The bypass button lets the user add oxygen to the breathing
circuit at any time.
Before the regenerated air is inhaled again, it flows through
the air cooler. The following cooler options are available:
– Ice cooler
The ice cooler contains ice packs that can be refrozen
after use.
– Regeneration cooler
The regeneration cooler (PCM [phase chage material]
cooler) contains a latent heat storage medium which
extracts some of the thermal energy from the alveolar air.
This melts the latent heat storage medium. After use, the
latent heat storage medium resolidifies when it is stored in
a cool place. This phase transition occurs at a
temperature of 27 °C. Afterwards, the
regeneration cooler is once again ready for use. The
maximum storage temperature must not be exceeded in
order to ensure the regeneration cooler retains its full
cooling capacity.
The closed-circuit breathing apparatus is connected to a
facepiece via a connecting piece.
3.2.2 Electronic monitoring system
The electronic monitoring system contains the onboard
electronics, the Connect ECU and the buddy-light.
The onboard electronics check various parameters of the
closed-circuit breathing apparatus. The results are visually
displayed on the Connect ECU and/or acoustically emitted. In
addition, the Connect ECU can be used as an automatic
distress signal unit.
The Connect ECU displays the cylinder pressure and
remaining period of use, among other things. The system
statuses are signalled by LEDs. Alarms and status messages
are also emitted acoustically.
The functions and times can be configured with the Dräger
PC Link software. The following describes the standard
configuration of the apparatuses upon delivery.
Alarms
27-3
Time (expired or remaining)
27-4
Left button
27-5
LED panel
27-6
Manual alarm button
27-7
Right button
27-8
Function key
27-9
Display
28
Shoulder strap
29
Waist belt
30
Chest strap (optional)
31
Hose strap
No-oxygen alarm
The alarm is issued when the
user is breathing from the
apparatus and the com-
pressed oxygen cylinder is
closed or empty.
Low-pressure alarm 1
The alarm is issued when the
cylinder pressure is 55 bar
1)
.
Low-pressure alarm 2
The alarm is issued when the
cylinder pressure is 10 bar.
Pre-alarm (motion sensor)
The alarm is triggered when
the motion detection is active
(function key removed) and
the Connect ECU does not
detect any significant move-
ment for 30 seconds.
Summary of Contents for BG ProAir
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