Dräger PSS BG 4 plus User manual

WARNING
Strictly follow the Instructions for Use.
The user must fully understand and strictly observe the
instructions. Use the product only for the purposes specified
in the Intended use section of this document.
!
Dräger PSS BG 4 plus
i
Draeger BG4 Maintenance Manual
Draeger Training Department
Reference Only - Material subject to change without notice
Draeger Training 11/16 rev 1

Dräger PSS BG 4 plus
Content
1For your safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.1 General safety statements . . . . . . . . . . . . . . . . . . . .4
1.2 Meaning of the alert icons . . . . . . . . . . . . . . . . . . . .4
Component Identification.......................5
2Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Product overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.1 Closed-circuit breathing apparatus . . . . . . . . . . . . . . 6
2.1.2 Sentinel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.1 Closed-circuit breathing apparatus . . . . . . . . . . . . . . 6
2.2.2 Electronic monitoring system . . . . . . . . . . . . . . . . . .6
2.3 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Limitations on use . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4.1 General cautions and limitations . . . . . . . . . . . . . . . 7
2.4.2 NIOSH cautions and limitations . . . . . . . . . . . . . . . . 7
2.4.3 Special or critical user’s instructions . . . . . . . . . . . . . 7
2.4.4 Restrictions to the usage period . . . . . . . . . . . . . . . . 8
2.5 Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.6 Explanation of symbols and type-identifying marks .9
3 Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Prior to first use . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Preparation for use . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3.1 Opening and closing the
closed-circuit breathing apparatus . . . . . . . . . . . . .10
3.3.2 Fitting the compressed oxygen cylinder . . . . . . . . .11
3.3.3 Inserting an ice pack . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.4 Testing correct functioning of the closed-circuit
breathing apparatus . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.5 Donning the closed-circuit breathing apparatus . . .13
3.4 During use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4.1 General instructions for use . . . . . . . . . . . . . . . . . .14
3.4.2 In an emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4.3 Switching off Sentinel alarms . . . . . . . . . . . . . . . . .14
3.5 After use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.1 Maintenance intervals . . . . . . . . . . . . . . . . . . . . . . .16
4.2 Disassembly of the closed-circuit
breathing apparatus . . . . . . . . . . . . . . . . . . . . . . . .17
4.2.1 Removing the compressed oxygen cylinder . . . . . .17
4.2.2 Removing the breathing hoses . . . . . . . . . . . . . . . .17
4.2.3 Disassembling and testing the connecting piece . .17
4.2.4 Removing the CO2 absorber . . . . . . . . . . . . . . . . .17
4.2.5 Removing and testing the pressure relief valve . . .18
4.2.6 Removing the breathing air cooler . . . . . . . . . . . . .18
4.2.7 Removing the lever .. . . . . . . . . . . . . . . . . . . . . . . .18
4.2.8 Removing breathing bag, drain valve, minimum valve
and where applicable the water absorber . . . . . . . .19
4.2.9 Removing the switch box . . . . . . . . . . . . . . . . . . . .19
4.2.10 Disassembling waist belt and shoulder straps . . . .20
4.2.11 Unfastening the plug-in connectors on the medium-
pressure hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.3 Cleaning and disinfecting . . . . . . . . . . . . . . . . . . . .20
4.3.1 Cleaning and disinfecting procedure
for the USA only . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.3.2
4.4
Cleaning and disinfecting procedure
for other countries . . . . . . . . . . . . . . . . . . . . . . . . . .21
Assembly of the closed-circuit breathing apparatus 21
4.4.1 Fitting waist belt and shoulder straps .. . . . . . . . . .21
4.4.2 Fitting the drain valve . . . . . . . . . . . . . . . . . . . . . . .21
4.4.3 Fitting the minimum valve . . .. . . . . . . . . . . . . . . . .21
4.4.4 Fitting the breathing bag .. . . . . . . . . . . . . . . . . . . .22
4.4.5 Fitting the breathing air cooler . . . . . . . . . . . . . . . .22
4.4.6 Connecting the hose of the constant metering
valve .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.4.7 Fitting the switch box . . . . . . . . . . . . . . . . . . . . . . .22
4.4.8 Fitting the CO2 absorber . . . . . . . . . . . . . . . . . . . .22
4.4.9 Assembling the connecting piece .. . . . . . . . . . . . .23
4.4.10 Fitting the breathing hoses . . . . . . . . . . . . . . . . . . .24
4.5 Testing of the closed-circuit breathing apparatus . .25
4.5.1 Preparation of test . . . . . . . . . . . . . . . . . . . . . . . . .26
4.5.2 Checking the response threshold of the
low pressure warning . . . . . . . . . . . . . . . . . . . . . . .26
4.5.3 Checking the inhalation valve . . . . . . . . . . . . . . . . .26
4.5.4 Checking the exhalation valve . . . . . . . . . . . . . . . .26
4.5.5 Checking the drain valve . . . . . . . . . . . . . . . . . . . .26
4.5.6 Performing the leak test with positive pressure . . .27
4.5.7 Checking the relief valve .. . . . . . . . . . . . . . . . . . . .27
4.5.8 Performing the high pressure leak test (optional) . .27
4.5.9 Checking constant metering valve and
bypass valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
4.5.10 Checking the minimum valve . . . . . . . . . . . . . . . . .27
4.5.11 Checking the residual pressure warning . . . . . . . . .28
4.5.12 Switching off the Sentinel and checking the battery
charge status . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
4.5.13 Closing the protective cover .. . . . . . . . . . . . . . . . .28
4.6 Inserting or replacing the Sentinel battery . . . . . . .28
4.7 Testing the functional capability of the Sentinel . . .29
4.8 Self-test sequence of the Sentinel . . . . . . . . . . . . .29
4.9 Replacing the pressure reducer . . . . . . . . . . . . . . .30
4.9.1 Removing the pressure reducer . . . . . . . . . . . . . . .30
4.9.2 Installing the pressure reducer . . . . . . . . . . . . . . . .30
5Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
6Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
7Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
8Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
9Order list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
10 Annex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Content
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35
37- 49
50 -61
62
63 - 66
-Bench Test Flow Chart .....................
- Test It 6100 - Testing a BG4 .............
-RZ 25 - Testing a BG4 ......................
-BG4 Test Checklist ...........................
-Isolation Plug Kit ...............................
-Isolation Testing / Troubleshooting ... 67 - 97
71 - 74
75 - 76
77 - 87
Pneumatics ............................
Sentinel System ....................
Breathing Loop Leak Check ..
Isolation ................................. 88 - 95
97
-Checklist Before Use ....................... 96
-Checklist After Use ..........................
- Part Lists ....................................... 98 - 145
98 - 101
102 -104
FPS 7000 Mask.....................
Panorama Nova ....................
BG4 Complete ...................... 105 - 141
- CO2 Canister Information/Testing......
- Battery Information ............................ 144 - 145
142 - 143
Content (cont.)
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Draeger Training 11/16 rev 1
- RZ 50e - Testing a BG4 ..................... 148 - 157
-RZ7000 Testing a BG4.............158-163

For your safety
Dräger PSS BG 4 plus 5
1 For your safety
1.1 General safety statements
Before using this product, carefully read these instructions
for use and those of the associated products.
Strictly follow the instructions for use. The user must fully
understand and strictly observe the instructions. Use the
product only for the purposes specified in the Intended use
section of this document.
It is extremely important that you read and understand
every aspect of these Instructions for Use, in addition to
receiving proper training, before attempting to use the
facepiece. Should you not thoroughly understand any
aspect of the Instructions for Use, call Dräger at 1-800-922-
1737.
Do not dispose of the instructions for use. Ensure that they
are retained and appropriately used by the product user.
Only trained and competent users are permitted to use
this product.
Comply with all local and national rules and regulations
associated with this product.
Devices or components for use in explosion-hazard areas
which have been tested and approved according to
national, European or international Explosion Protection
Regulations may only be used under the conditions
specified in the approval and with consideration of the
relevant legal regulations. The devices or components may
not be modified in any manner. The use of faulty or
incomplete parts is forbidden. The appropriate regulations
must be observed at all times when carrying out repairs on
these devices or components.
Only trained and competent personnel are permitted to
inspect, repair and service the product as detailed in these
instructions for use. Further maintenance work that is not
detailed in these instructions for use must only be carried
out by Dräger or personnel qualified by Dräger. Dräger
recommend a Dräger service contract for all maintenance
activities.
Only authentic Dräger spare parts and accessories may be
used for maintenance. Otherwise the proper functioning of
the product may be impaired.
Do not use a faulty or incomplete product. Do not modify
the product.
Notify Dräger in the event of any product or component
fault or failure.
1.2 Meaning of the alert icons
The following alert icons are used in this document to identify
and highlight areas of text that require greater awareness by
the user. A definition of the meaning of each icon is as follows:
DANGER
Indicates an imminently hazardous situation which,
if not avoided, will result in death or serious injury.
WARNING
Indicates a potentially hazardous situation.
If not avoided, this situation could result in death or
serious injury.
CAUTION
Indicates a potentially hazardous situation. If not
avoided, this situation could result in physical injury or
damage to the product or environment. It may also be
used to alert against unsafe practices.
NOTICE
Indicates additional information on how to use the
product.
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Draeger Training 11/16 rev 1

3Dräger PSS BG 4 plus
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33321851_us
Fig A
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Fig. B
10 11
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6Dräger PSS BG 4 plus
Description
2 Description
2.1 Product overview
2.1.1 Closed-circuit breathing apparatus
►Illustrations on page 5
1 Exhalation breathing hose
2 Connecting piece with sealing cap
3 Bayonet ring
4 Sentinel
5Waistbelt
6 Cylinder valve
7 Bypass valve
8 Inhalation breathing hose
9 Reinforcing rings
10 Safety catch on the pressure relief valve
11 Breathing air cooler
12 Hand wheel with anti-vibration strap
13 Carrying frame
14 Belt
15 Pressure relief valve
16 Drain valve
17 Compressed oxygen cylinder
18 Breathing bag
19 Spring holder
20 Control line
21 CO2absorber
►Illustration page 5 (figure B)
1 Pressure reducer
2 Yellow medium pressure hose to minimum valve
3 Safety catch
4 Blue medium pressure hose of constant metering valve
5 Sensor unit/switch box
6 Line to sensor unit
7 Minimum valve
2.1.2 Sentinel
►Illustration page 5 (Figure A)
1Display
2 Panic button
3 Right button
4 Function key for motion sensor
5 Red LEDs
6 Alarm device
7 Green LED
8 Left button
2.2 Functional description
2.2.1 Closed-circuit breathing apparatus
The PSS BG 4 plus closed-circuit breathing apparatus is a
regeneration unit with pure oxygen supply in excess pressure
version. 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 CO2absorber. Either a disposable cartridge or a refillable
cartridge can be used.
The breathing air is enriched with oxygen from the compressed
oxygen cylinder:
via constant metering valve in the case of low breathing
rates
in the case of higher breathing rates additionally via the
minimum valve or the bypass valve which is then manually
operated.
Before the regenerated air is inhaled again, it flows through the
air cooler. To reduce the temperature of the inhaled air further,
and thus minimize the physical discomfort of the wearer, the air
cooler can be filled with ice. The use of ice in the cooling
system is only required at ambient temperatures above 32 °F
(0 °C). At temperatures below 32 °F (0 °C), ice must never be
used.
The closed-circuit breathing apparatus is connected to a full
facepiece by means of the connecting piece. One version of
the connecting piece has a condensate trap where the
condensate from the breathing air collects during use.
A water absorber is available as an option. It is connected to
the drain valve on the breathing bag and absorbs the water
that is delivered via the valve.
To be able to use the closed-circuit breathing apparatus in
particularly low or high temperatures, the following
accessories are available:
Radiant heat protection for the breathing hose and the
protective cover:
Protects against radiant heat and prevents foreign bodies
penetrating through the openings into the carrying frame of
the closed-circuit breathing apparatus.
2.2.2 Electronic monitoring system
The electronic monitoring system comprises a sensor unit,
switch box and Sentinel. The electronic monitoring system is
connected to the breathing circuit via the control line.
The sensor unit measures the available oxygen pressure in the
compressed oxygen cylinder and the pressure in the breathing
circuit. The values are compared in the switch box. Alarms are
triggered at specific values.
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Description
Dräger PSS BG 4 plus 7
The following information is displayed on the Sentinel in
normal mode (operating mode display):
1 Oxygen pressure, analog
2 Oxygen pressure, digital
3 Remaining period of use up to the beginning of the first re-
sidual pressure warning in minutes
The Sentinel issues the following warnings:
first residual pressure warning
The warning sounds at 700 psi to 870 psi/50 bar to 60 bar
accordingto the relevant country-specific settings. When
this warning sounds, approx. 75 % of the oxygen has been
used up. The Sentinel issues an intermittent tone for
30 seconds and the red LEDs flash continuously.
second residual pressure warning
When this warning sounds, approx. 95 % of the oxygen
has been used up. The Sentinel issues an intermittent tone
continuously and the red LEDs flash continuously.
low pressure warning
When the device is put into operation and the cylinder is
closed, the Sentinel issues an intermittent tone and the
"Open cylinder valve" symbol appears on the display.
The Sentinel can function as an automatic distress signal unit
and issue an alarm when the wearer is no longer moving:
When the wearer starts operation and the function key is
removed from the Sentinel, the motion sensor is activated. The
"Motion sensor activated" symbol is displayed briefly
(see chapter 2.6 on page 9). If no further motion is detected,
a pre-alarm sounds after approx. 25 seconds. If any
movement is detected within the following approx. 10 seconds,
the pre-alarm is cancelled. If no motion is detected, the main
alarm sounds. The main alarm can be acknowledged as
follows:
The function key is re-inserted.
Both buttons on the Sentinel are pressed.
The apparatus wearer can trigger an emergency signal using
the yellow panic button if the wearer cannot retreat from the
hazard area.
The left button can be used to switch on the backlight for
5 seconds.
The ambient temperature can be displayed using the right
button.
The Sentinel has an infrared PC interface. Optional Windows
software is available to use the infrared interface for the
following functions:
Custom configuration of the Sentinel
Export of all parameters from the Sentinel
2.3 Intended use
The closed-circuit breathing apparatus supplies breathing air
for approx. 4 hours, thus making it unnecessary for the wearer
to breathe polluted ambient air lacking in oxygen. It is used by
the fire services and for appropriate missions in underground
and open-cast mines, as well as in industry.
2.4 Limitations on use
2.4.1 General cautions and limitations
The closed-circuit breathing apparatus must never be used for
diving.
2.4.2 NIOSH cautions and limitations
The cautions and limitations are also listed on the approval
label, please refer to chapter 10 on page 34.
J - Failure to properly use and maintain this product could
result in injury or death.
M - All approved respirators shall be selected, fitted, used,
and maintained in accordance with MSHA, OSHA, and
other applicable regulations.
N - Never substitute, modify, add, or omit parts. Use only
exact replacement parts in the configuration as
specified by the manufacturer.
O - Refer to User´s Instructions, and/or maintenance
manuals for information on use and maintenance of
these respirators.
S - Special or critical user´s instructions and/or specific use
limitations apply. Refer to User´s Instructions before
donning.
35321728.eps
psi
1
3
2
NOTICE
Short-term full submersion of the apparatus under
water (e.g. when crossing a water hole in a mine) does
not result in impairing the correct functioning of the
closed-circuit breathing apparatus.
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8Dräger PSS BG 4 plus
Description
2.4.3 Special or critical user’s instructions
Approved for use at temperatures above 23 °F (–5 °C).
Ice in the cooling system may only be used at ambient
temperatures above 32 °F (0 °C).
At temperatures below 32 °F (0 °C), ice must never be
used.
The cylinder is to be charged with compressed oxygen
meeting U.S.P. specifications.
Anti-fog solution must be applied to the full facepiece
before each use.
The CO2absorber must never be used after its indicated
expiration date. See instructions for use of refillable
cartridge 90 21 360.
Never re-use disposable CO2absorber cartridges.
After each use of the closed-circuit breathing apparatus, a
fully charged cylinder and a recharged/new CO2absorber
must be installed.
All parts which get into contact with the exhaled air must be
thoroughly cleaned and disinfected after use.
Do not use this apparatus where there is direct exposure of
open flames or in high radiant heat.
Keep exposed hair to a minimum when using the
apparatus near open flames or in high radiant heat.
A good facepiece seal is crucial since facepiece leakage
will seriously reduce service time.
Use of pure oxygen or oxygen enriched air increases
flammability and lowers the ignition temperature of most
materials.
2.4.4 Restrictions to the usage period
The estimated usage period amounts to approximately 4 hours
if the following requirements are met:
The user is an average-sized man in good physical health.
The working conditions are moderate.
The compressed oxygen cylinder is completely full.
The apparatus has been adequately maintained and
tested.
The usage period can be reduced considerably depending on
the following factors:
the physical condition of the user (the worse physical
shape the user is in, the more oyxgen he will consume)
the degree of exertion (the harder the user works, the more
oyxgen he will consume)
the emotional condition of the user (the more anxious or
excited the user is, the more oyxgen he will consume)
the condition of the device (Poorly maintained or poorly
adjusted devices may leak. They should therefore always
be maintained according to the respective instructions for
use.)
the cylinder pressure before use (If the cylinder is not filled
to capacity, usage time is reduced proportionately.
The cylinder pressure should amount to at least 2600 psi /
180 bar.)
2.5 Approvals
The closed-circuit breathing apparatus is approved in
accordance with DIN EN 145 with the following facepieces:
Dräger FPS 7000 RP Series
Panorama Nova RP Series
It conforms to the following regulations:
PPE Directive 89/686/EEC
vfdb Regulations 0802:2006
The closed-circuit breathing apparatus is also approved by
NIOSH according to the NIOSH guidelines 42 CFR, part 84,
subpart H. Only combinations that are approved by NIOSH
may be used (see approval label on page 34). Otherwise the
correct functioning of the device may be compromised.
The Sentinel meets the explosion protection requirements of
the following standards:
It was tested in methane-air mixtures by the Mine Safety and
Health Administration (MSHA) and is registered with approval
number 18-A080008-0 for the use in gaseous mines.
WARNING
For many users, actual air supply times will be far less
than 4 hours! For example, users who are out of sha-
pe, stressed, larger than average, working in difficult
conditions, inexperienced, or who have not maintained
the device properly will drastically lessen their actual
air-supply times.
UL913 Class I Division 1, Group A, B, C, D
Class II Group E, F, G
Ex ia T4
(Ta:-22 °F to +140 °F
Ta: -30 °C to +60 °C)
CAN/CSA-C22.2,
No. 157
Class I Division 1, Group A, B, C, D
Class II Group E, F, G
Ex ia T4
(Ta:-22 °F to +140 °F
Ta: -30 °C to +60 °C)
!
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Description
Dräger PSS BG 4 plus 9
2.6 Explanation of symbols and type-
identifying marks
USA use the PSS BG 4 AP or PSS BG 4 APK.
Canada use the PSS BG 4 CP or PSS BG 4 CPK.
Units with a "K" in the designation are equipped with a
connector with a condensate trap.
The following information can be shown on the Sentinel
display:
The LEDs have the following meanings:
NOTICE
Sentinels for the USA indicate the pressure in psi,
whereas the Sentinel for Canada indicates the pressu-
re in bar.
Symbol Meaning
Test completed successfully.
An error has occurred.
The error is indicated by the letter in front of
the X.
Further information can be obtained from
Dräger.
The numbers to the left of this symbol give
the remaining period of use in minutes.
The leak test is currently running.
Infrared connection between Sentinel and
IR interface.
The function key has been inserted.
The motion sensor is disabled.
The function key has been removed.
The motion sensor is activated.
Battery symbol
First battery warning
Second battery warning
Open cylinder valve!
Close cylinder valve!
900 (CP)
902 (AP)
Country code (information on which cylinder
threaded connection is programmed in the
Sentinel):
900: W21.8x1/14"
902: AP 902
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LED Meaning
Green LED
flashing
The Sentinel is in normal operating mode.
Red LEDs
flashing
The Sentinel is issuing an alarm or an error
has occurred during the self-test.
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10 Dräger PSS BG 4 plus
Use
3Use
3.1 Prerequisites
Check which protective clothing and which head protection
also needs to be worn during usage.
Follow local and national regulations on the use of
respiratory protective devices such as OSHA 1910.134.
The following requirements must be met so that the closed-
circuit breathing apparatus can be used:
The CO2absorber (refillable cartridge) was filled within
the last 6 months.
The CO2absorber (refillable cartridge or disposable
cartridge) was installed into the closed-circuit breathing
apparatus and leak-tested within the last 6 months.
The CO2absorber was transported on a vehicle for no
further than 310 miles (500 km).
The compressed oxygen cylinder is full.
The leak-tightness and functional test on the closed-circuit
breathing apparatus showed no faults (see chapter 4.5 on
page 25).
Under the following prerequisites, the closed-circuit
breathing apparatus can be used multiple times by the
same user within 24 hours:
The officer-in-charge decides before each further use
whether the remaining oxygen supply is adequate for
use.
The cylinder valve is fully closed after every use.
This means that the breathing circuit is vented
automatically. The connecting piece is sealed with
the sealing cap.
The compressed oxygen cylinder and CO2absorber
are not replaced.
The closed-circuit breathing apparatus is stored upright
at a temperature of more than 32 °F (0 °C).
3.2 Prior to first use
1. Perform a visual inspection: Is the closed-circuit breathing
apparatus intact and complete?
2. Test the closed-circuit breathing apparatus (see chapter 4.5
on page 25).
3.3 Preparation for use
1. Open the closed-circuit breathing apparatus if necessary
(see chapter 3.3.1 on page 10).
2. Fit the CO2absorber if necessary (see chapter 4.4.8 on
page 22). In this case, test the closed-circuit breathing ap-
paratus (see chapter 4.5 on page 25).
3. Fit the compressed oxygen cylinder if necessary
(see chapter 3.3.2 on page 11).
4. Insert the ice if necessary (see chapter 3.3.3 on page 12).
5. Test the correct functioning of the closed-circuit breathing
apparatus (see chapter 3.3.4 on page 12).
6. Close the closed-circuit breathing apparatus if necessary
(see chapter 3.3.1 on page 10).
7. Don the closed-circuit breathing apparatus
(see chapter 3.3.5 on page 13).
3.3.1 Opening and closing the closed-circuit breathing
apparatus
Open the closed-circuit breathing apparatus as follows:
1. Slide the sliding bolts on the handle of the closed-circuit
breathing apparatus using your thumb and finger and tip
over so that they engage.
2. Fold out the protective cover until the guide and the two
pins on the lower edge are unlocked.
3. Unhook the pin and remove the protective cover.
Close the closed-circuit breathing apparatus as follows:
1. Attach the guide and the two pins on the lower edge of the
cover in the device.
2. Close the protective cover.
3. Tilt the sliding bolts and slide outwards.
CAUTION
The closed-circuit breathing apparatus may only be
used when the functional test has not produced any
faults.
!
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Use
Dräger PSS BG 4 plus 11
3.3.2 Fitting the compressed oxygen cylinder
Compressed oxygen cylinder may only be filled with oxygen of
the following quality characteristics:
Purity: ≥99.5 vol. % O2
Water content: ≤0.05 mg/L oxygen
Tasteless and odorless
For the maximum permissible contaminants national
regulations apply, in the USA for example 42 CFR, Part 84
(NIOSH):
carbon monoxide (CO): 0.001 Vol.-%
carbon dioxide (CO2): 0.03 Vol.-%
The maximum charging pressure is 3000 psi/206 bar.
Fit the compressed oxygen cylinder as follows:
1. Test the high pressure sealing ring on the pressure reducer
connecting piece for damage and impurities. It must be
clean and undamaged. Replace if necessary.
2. Ensure that the cylinder mount is adjusted to the diameter
of the cylinder.
3. Insert the compressed oxygen cylinder into the carrying
frame (3).
4. Screw the hand wheel onto the pressure reducer (2).
Do not use any tools to tighten.
5. Thread the belt into the buckle and close the hook-and-
loop fastener (1).
6.Tension the anti-vibration device and hook it into the hand
wheel.(4) Strap should be at 12:00 position.
WARNING
Ensure that the connections are not soiled with oil or
grease. To avoid death or serious injury never allow
pressurized oxygen to come into contact with oil,
grease or similar contaminants. Either a fire, an
explosion or both may also be caused.
!
100mm
108mm
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12 Dräger PSS BG 4 plus
Use
3.3.3 Inserting an ice pack
Prepare the ice pack as follows:
1. Fill the freezer receptacle with water. Leave approx.
2 inches/50 mm free up to the edge.
2. Allow to freeze completely in a deep freezer at approx.
5 °F/-15 °C for at least 16 hours.
3. Fill the ice receptacle up to the rim with water and leave to
freeze again for another 8 hours in the deep freezer.
Ensure that the ice receptacle is not tilted so that a level
surface is obtained.
4. To remove the ice pack, hold the freezer receptacle briefly
under running water.
Insert the ice pack into the breathing air cooler as follows:
1. Lift the locking device (3) and release the catch (4) in anti-
clockwise direction.
2. Remove the cover from the breathing air cooler.
3. Insert the ice pack into the breathing air cooler.
4. The catch is turned on the cover. Ensure that the catch is
fully open to avoid damage to the positioning aids on the
breathing air cooler when the breathing air cooler is sealed
with the cover.
5. Align the positioning aids on the breathing air cooler (1)
and the cover (2).
6. Press the cover into the breathing air cooler.
7. Turn the catch clockwise to lock the cover. The guide slot
on the catch must hold the lugs on the breathing air cooler.
The catch must engage audibly.
3.3.4 Testing correct functioning of the closed-circuit
breathing apparatus
1. Open the cylinder valve.
The Sentinel switches itself on when the pressure in the
compressed oxygen cylinder is greater than 145 psi/10 bar
and the self-test sequence starts automatically
(see chapter 4.8 on page 29).
2. Close the cylinder valve.
The "remaining period of use" symbol appears on the
display. A single alarm tone sounds. The bar chart runs
once again from left to right.
If the closed-circuit breathing apparatus is OK, the "Open
cylinder valve" symbol is displayed and a dual alarm tone
sounds.
3. Keep the cylinder valve closed.
4. Remove the sealing cap from the connecting piece and
wait until the Sentinel displays a pressure of 0 psi/0 bar.
5. Fit the protective cap back onto the connecting piece.
The Sentinel can display the following results:
NOTICE
Ice in the cooling system may only be used at ambient
temperatures above 32 °F (0 °C).
At temperatures below 32 °F (0 °C), ice must never be
used.
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Display on the Sentinel Meaning
The test has been completed
successfully.
An error has occurred.
Do not use the closed-circuit
breathing apparatus. Check
once again that the closed-
circuit breathing apparatus is
functioning correctly or have
the device serviced by
Dräger or trained experts.
Battery warning 1
A long warning tone sounds
at the same time.
With normal use of the
Sentinel, the closed-circuit
breathing apparatus remains
fully functional for up to
4 hours. To ensure safe
usage, the battery should be
replaced, however.
Battery warning 2
At the same time, 5 short
alarm tones sound and the
red LEDs flash.
The Sentinel automatically
powers off and any further
operation is impossible.
The battery must be replaced
before before any new
operation.
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Use
Dräger PSS BG 4 plus 13
3.3.5 Donning the closed-circuit breathing apparatus
1. Open the waist belt:
Pinch the latch together. Open the hook and eye.
2. Open both shoulder straps:
Press the adjusting clamp upwards with your thumb and
simultaneously with the other hand pull the long end.
3. Position the closed-circuit breathing apparatus upright and
hang the breathing hoses over the protective cover.
4. Reach your arms through the shoulder straps and lift up the
closed-circuit breathing apparatus.
5. Lift the closed-circuit breathing apparatus over your head,
position your head between the breathing hoses (figure A)
and allow the closed-circuit breathing apparatus to drop
onto your back until the shoulder straps are positioned on
the shoulders.
6. Uniformly pull down and tighten the shoulder straps so that
the padding on the waist belt rests on your hip (figure B).
7. Close the waist belt and adjust the width.
8. Pull the ends of the waist belt until the closed-circuit
breathing apparatus rests firmly on your hips.
9. Insert the ends of the waist belt in the loops on the right and
left-hand sides.
10. If required, loosen the shoulder straps slightly until
comfortable.
11. Check the position of the three reinforcing rings on the
breathing hoses and readjust if necessary: Fix the middle
ring with the hose support centrally on the shoulder. The
other reinforcing rings should also rest on the shoulder.
12. If the closed-circuit breathing apparatus has a connecting
piece with condensate trap, ensure that the sealing plug is
screwed securely into the connecting piece.
13. Fasten the full facepiece.
14. Remove the sealing cap from the connecting piece,
breathe in deeply and hold your breath.
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 Sentinel powers on automatically and runs a self-test
(see chapter 4.8 on page 29).
17. Use the display on the Sentinel 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 full facepiece. Hold your breath
for about 10 seconds. The vacuum must be maintained; if
it is not, the harness on the full facepiece must be re-
tightened.
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CAUTION
When carrying heavy loads on the shoulder, the
breathing hoses may be squeezed thus interrupting
the breathing circuit.
For this reason, the reinforcing rings must be in the
correct position during use as well.
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 2600 psi/180 bar.
!
!
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14 Dräger PSS BG 4 plus
Use
19. Press the left button on the Sentinel 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 CO2generates 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 700 psi/
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 Sentinel.
The backlight is switched on for 5 seconds.
When the ambient temperature is to be displayed, press
the right button on the Sentinel 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 9) 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 Sentinel alarms
Switch off all alarms (except the pre-alarm) as follows:
Press the right and left buttons on the Sentinel
simultaneously until the alarm stops. The Sentinel returns
to normal operating mode and the operating mode display
is shown once again.
If the Sentinel is used as automatic distress signal unit and
the pre-alarm sounds, this pre-alarm can only be
acknowledged by moving the Sentinel.
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 practiced
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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Use
Dräger PSS BG 4 plus 15
3.5 After use
1. Unplug the connecting piece from the full facepiece:
Press the button on the full facepiece and simultaneously
remove the connecting piece from the full facepiece.
2. Close the cylinder valve immediately after pulling out the
connecting piece. The air is automatically let out of the
breathing circuit.
3. Fit the protective cap onto the connecting piece.
4. Remove the full facepiece.
5. Switch off Sentinel:
Simultaneously hold the right and left hand button pressed
down until a short beep sounds.
The charge status of the battery is displayed for approx.
3 seconds. The Sentinel switches off.
6. Take off the closed-circuit breathing apparatus:
a. Open the waist belt:
Pinch the latch together. Open the hook and eye.
b. Draw the breathing hoses back over your head and lay
them over the protective cover behind you.
c. Unfasten both shoulder straps:
Push the adjusting clamps upwards with your thumb.
d. Slowly allow the closed-circuit breathing apparatus to
slide down your back and place it upright on the ground.
Do not drop the apparatus!
7. Have the closed-circuit breathing apparatus serviced
(see chapter 4 on page 16).
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16 Dräger PSS BG 4 plus
Maintenance
4 Maintenance
Maintenance is carried out in the following order:
1. Disassemble the closed-circuit breathing apparatus and
replace faulty parts (see chapter 4.2 on page 17).
2. Clean, disinfect and dry the closed-circuit breathing
apparatus (see chapter 4.3 on page 20).
3. Assemble the closed-circuit breathing apparatus
(see chapter 4.4 on page 21).
4. Test the closed-circuit breathing apparatus (see chapter 4.5
on page 25).
4.1 Maintenance intervals
Component Work to do
Every 6 months Annually Every 5years Every 6 years
Closed-circuit breathing apparatus Visual inspection, test function and sealing X1X2
Clean and disinfect AFTER EVERY USE
Major overhaul3X
CO2absorber (disposable cartridge) Replace X4
CO2absorber (refillable cartridge) Refill X4
Compressed oxygen cylinder U.S.DOT5X6
1 Applies to closed-circuit breathing apparatus that is constantly in use
2 Applies to reserve stocks
3 Only performed by expert personnel. Send the pressure reducer to Dräger for major overhaul.
4 Applies to CO2absorbers in closed-circuit breathing apparatus that are stored on vehicles or in the depot, tested in accordance with
chapter 4.5 on page 25 and the connecting piece of which is sealed with the corresponding protective cap.
5 Hydro-testing in accordance with the local requirements.
6 Composite cylinder: Life cycle = 15 years from date of manufacture.
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Maintenance
Dräger PSS BG 4 plus 17
4.2 Disassembly of the closed-circuit
breathing apparatus
1. Open the closed-circuit breathing apparatus
(see chapter 3.3.1 on page 10).
2. Remove the compressed oxygen cylinder
(see chapter 4.2.1 on page 17).
3. Disconnect the breathing hoses (see chapter 4.2.2 on
page 17).
4. Disassemble and test the connecting piece
(see chapter 4.2.3 on page 17).
5. Remove the CO2absorber (see chapter 4.2.4 on page 17).
6. Remove and test the pressure relief valve
(see chapter 4.2.5 on page 18).
7. Remove the breathing air cooler (see chapter 4.2.6 on
page 18).
8. Remove the lever (see chapter 4.2.7 on page 18).
9. Remove breathing bag, drain valve, minimum valve and -
where applicable - the water absorber (see chapter 4.2.8
on page 19).
10. Remove the switch box (see chapter 4.2.8 on page 19).
11. Remove waist belt and shoulder straps (see chapter 4.2.10
on page 20).
4.2.1 Removing the compressed oxygen cylinder
1. Ensure that the cylinder valve (2) is closed.
2. Release the anti-vibration strap (3).
3. Open the hook-and-loop fastener (1) and pull the strap out
of the buckle.
4. Unfasten the hand wheel from the pressure reducer. Do not
use any tools to unfasten.
5. Remove the compressed oxygen cylinder from the closed-
circuit breathing apparatus and seal with the lock nut.
Re-fill the compressed oxygen cylinder1.
4.2.2 Removing the breathing hoses
1. Open the safety straps on the shoulder straps.
2. Turn the bayonet rings on the closed-circuit breathing
apparatus anti-clockwise until they disengage.
3. Take the breathing hoses off the closed-circuit breathing
apparatus.
4. Drain off the condensate that has accumulated in the
breathing hoses.
4.2.3 Disassembling and testing the connecting piece
1. Turn the bayonet rings on the connecting piece anti-
clockwise until they disengage.
2. Take the breathing hoses off the connecting piece.
3. Remove the inhalation and exhalation valve seats from the
connecting piece.
4. Take the valve disks out of the valve seats and test.
Dispose of any damaged valve disks.
5. If the closed-circuit breathing apparatus has a connecting
piece with condensate trap, open the sealing plug and
drain the condensate.
4.2.4 Removing the CO2absorber
1. Disconnect the breathing bag from the CO2absorber.
To do this, stretch the tab on the sleeve (1) and remove.
2. Unfasten the control line (2) from angled connector and
switch box (see chapter 4.2.11 on page 20).
WARNING
Ensure that the connections are not soiled with oil or
grease. To avoid death or serious injury never allow
pressurized oxygen to come into contact with oil,
grease or similar contaminants. Either a fire, an
explosion or both may also be caused.
1 see the instructions for use for the compressed oxygen cylinder
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!
CAUTION
Risk of chemical burns!
The CO2absorber may contain alkaline liquid which
may leak out during disassembly!
Wear protective clothing, protective gloves and
goggles.
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18 Dräger PSS BG 4 plus
Maintenance
3. Check that the control line is dry inside.
If necessary, use compressed air acc. to CGA G7.1
Grade D or better to carefully blow-dry.
4. Press the safety catch handles (3) together and remove the
angled connector from the CO2absorber.
5. Release the tensioning bar (4).
6. Grip the CO2absorber on the grommet and tilt upwards.
7. Take the CO2absorber out of the lower retaining bracket
and remove from the carrying frame.
8. Dispose of the disposable cartridge or re-fill the refillable
cartridge.
4.2.5 Removing and testing the pressure relief valve
1. Move the pressure relief valve to the right (1) until the
clamps (2) can be pressed together.
2. Take the pressure relief valve off the spring holder.
3. Examine the O-ring of the angled connector; it must be
clean and undamaged, otherwise it must be replaced.
4. Take the valve cover (4) off the pressure relief valve.
5. Unhook the stepped valve disk (3) from the valve cover.
6. Take valve disk (5) and O-ring (6) out and check. They must
be clean and undamaged.
Replace faulty parts. Apply Molykote 111 thinly to the
O-ring.
7. Re-fit the pressure relief valve.
4.2.6 Removing the breathing air cooler
1. Unhook the breathing bag from the breathing air cooler.
To do this, stretch the tab on the sleeve (A-1) and remove.
2. Unfasten the medium-pressure hose of the constant
metering valve (B-3) from the breathing air cooler
(see chapter 4.2.11 on page 20).
3. Unfasten the tensioning bar (B-2).
4. Remove the breathing air cooler.
5. Remove the cover from the breathing air cooler.
To do this, lift the locking device (B-5) and release the catch
(B-4) in an anti-clockwise direction.
6. Drain the water of the ice pack.
4.2.7 Removing the lever
1. Lift the safety knob (1) and pull the lever to the right.
2. Lift the safety knob (2) and remove the lever.
NOTICE
Refillable cartridges may only be filled shortly before
they are fitted into the closed-circuit breathing
apparatus. Take the corresponding instructions for use
into account.
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Maintenance
Dräger PSS BG 4 plus 19
4.2.8 Removing breathing bag, drain valve, minimum
valve and where applicable the water absorber
1. Compress the springs underneath the spring holder and
remove.
2. Unfasten the medium-pressure hose of the minimum valve
from the pressure reducer (see chapter 4.2.11 on page 20).
3. Remove the drain valve (A-4) from the retaining clips (A-5).
4. Release the safety catch (2) from the stop tab (1) on the
spring carrier.
5. Remove the breathing bag with minimum valve (3) and
drain valve from the spring holder.
6. Detach the minimum valve from the breathing bag:
To do this, stretch the tab on the sleeve and remove from
the minimum valve.
7. If a water absorber is fitted:
Remove the water absorber from the drain valve and
dispose of it.
8. Detach the drain valve from the breathing bag:
To do this, stretch the tab on the sleeve and remove.
9. If the breathing bag needs to be replaced, unhook the
pressure plate (B-6) from the breathing bag.
10. Check the drain valve:
a. Unscrew the cover (8).
b. Remove the valve disk (7), check and replace with
a new valve disk if necessary.
c. Insert the shaft of the valve disk into the hole.
d. Position the springs (10) centrally onto the valve disk.
e. Screw the cover on securely.
4.2.9 Removing the switch box
1. Use a slotted screwdriver to release the switch box from
the holder.
2. Pull the switch box out of the holder and put it aside. Do not
detach the electrical lines.
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20 Dräger PSS BG 4 plus
Maintenance
4.2.10 Disassembling waist belt and shoulder straps
1. Lift the locking clips on the waist belt (1) in the carrying
frame and push outwards through the slots.
2. Remove the shoulder straps from the waist belt if necessary.
3. Press the waist belt inwards at the fixing point (2), rotating
by 90° and move outwards.
4. Open the press studs on the hoses and remove the
Sentinel from the shoulder strap.
5. Tilt the locking clips on the shoulder straps upwards into the
carrying frame and press outwards through the slits.
4.2.11 Unfastening the plug-in connectors on the
medium-pressure hoses
The plug-in connectors are secured. They can be unfastened
as follows:
Use removal tool R 34 5361to press on the ring and
simultaneously remove the plug-in connector from the
corresponding component.
4.3 Cleaning and disinfecting
All parts which get into contact with the exhaled air must be
thoroughly cleaned and disinfected after use. All other parts
should only be cleaned if required.
When contaminated with hazardous substances:
Wear personal protective clothing.
Dispose of waste water and cloths in accordance with the
applicable waste disposal regulations.
NOTICE
Only remove waist belt and shoulder straps if very dirty
or if they need to be replaced.
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CAUTION
Do not use any solvents (e.g. acetone, alcohol) or
cleaning agents containing abrasive particles for
cleaning and disinfecting. Only use the prescribed
process and use the cleaning and disinfection agents
given. Other agents, dosages and contact times may
damage the product.
The undiluted agents are damaging to health if they
come into direct contact with the eyes or skin. For this
reason, wear safety goggles and protective gloves
when working with these agents.
NOTICE
Since the use of certain cleaning and disinfecting
agents is not allowed among all countries, Dräger
tested and recommends several cleaning and
disinfecting agents. Make sure to follow the procedure
that is suitable for your country.
For further information please contact Dräger or your
local dealer.
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Draeger Training 11/16 rev 1