Dräger LFB PSS 7000 Manual

Policy | Procedure
Review date: 29 January 2023 Last amended date: 5 May 2020
476 Issue date: 17 November 2006 1 of 80
Respiratory protective equipment –breathing apparatus –
Dräger PSS 7000 –technical information
New policy number:
476
Old instruction number:
TEC:B010:b1
Issue date:
17 November 2006
Reviewed as current:
29 January 2020
Owner:
Assistant Commissioner, Operational Policy
Responsible work team:
RPE and Hazmat PPE
Contents
1Introduction..................................................................................................................3
2Component parts ...........................................................................................................6
3Backplate assembly ........................................................................................................9
4Harness and cylinder strap assembly................................................................................ 10
5Telemetry module........................................................................................................ 11
6Charging BA set from appliance...................................................................................... 11
7FPS 7000 dual purpose face mask ................................................................................... 13
8Lung demand valve (LDV) ............................................................................................. 15
9Pneumatic system ........................................................................................................ 16
10 Second person connection............................................................................................. 17
11 Bodyguard 7000 electronic monitoring unit (EMU)............................................................. 19
12 Bodyguard in use functions............................................................................................ 20
13 Bodyguard electronic monitoring unit self-check................................................................ 22
14 SDBA cylinder............................................................................................................. 23
15 SDBA set –lifting and carrying instructions ....................................................................... 32
16 EDBA cylinder............................................................................................................. 32
17 EDBA set –lifting and carrying instructions ....................................................................... 36

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18 Receipt test and monthly 28 day test................................................................................ 37
19 PSS 7000 ’A’ test.......................................................................................................... 38
20 PSS 7000 ‘B’ test.......................................................................................................... 44
21 Equipment allocation .................................................................................................... 53
22 Defective equipment .................................................................................................... 54
23 RPE maintenance rooms ................................................................................................ 56
24 Technical data ............................................................................................................. 57
Glossary RPE generic ........................................................................................................... 60
Appendix 1 –Working in hi-expansion foam ............................................................................ 61
Appendix 2 –Returning the BA set to OSG .............................................................................. 62
Appendix 3 –‘A’ test aide-memoire and BPA ........................................................................... 64
Appendix 4 –‘B’ test aide memoire and BPA ............................................................................ 70
Appendix 5 –BA set charging point and stowage defect codes.................................................... 77
Document history ............................................................................................................... 78

476 Issue date: 17 November 2006 3 of 80
1Introduction
1.1 This policy provides technical information for the Dräger PSS 7000 breathing apparatus (BA) set.
Information on breathing apparatus procedures is contained in Policy number 466 –Respiratory
protective equipment - breathing apparatus –operational procedures.
1.2 The PSS 7000 standard duration breathing apparatus (SDBA) set will give a working duration of
31 minutes when applying a consumption rate of 50 litres per minute (LPM). The safety margin
duration is 12 minutes with the electronic low pressure warning (LPW) actuating at 84 bar.
1.3 The PSS 7000 extended duration breathing apparatus (EDBA) set will give a working duration of
45 minutes when applying a consumption rate of 58 litres per minute (LPM). The safety margin
duration is 18 minutes with the electronic low pressure warning (LPW) actuating at 84 bar.
1.4 For operational use the complete BA set is made up of a PSS 7000 BA set including cylinder with
cover fitted, entry control tally, personal line, BA cable cutter in pouch and log book (which is
held on station unless BA set is sent for service or repair).
1.5 Main features of the PSS 7000 set:
•Positive pressure, first breath activated.
•Ergonomic carrying system, adjustable to suit wearer.
•Electronic monitoring unit with telemetry.
•Second person connection hose and quick release coupling (QRC) coupling.
•Dual purpose face mask (DPFM) that allows for either the connection of a lung demand valve
(LDV) positive pressure, or a filter cartridge (FC) negative pressure.
1.6 For further information regarding this policy, please email the RPE and Hazmat PPE mailbox

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PSS 7000 SDBA set overview
In-line connection QRC
Waist belt
LFB image id 1136791
FPS 7000 dual purpose face mask
Inner mask
Lung demand valve, first breath
button and additional flow button
Second person connection QRC
Bodyguard 7000 user interface unit
(display), DSU button and low
pressure warning device
Padded shoulder harness
SDBA 8 litre cylinder and cover
BA personal line, escape hood and
BA cable cutter
Second person connection
and Bodyguard 7000 air
supply hoses
‘D’ ring for attachment of
personal line karabiner –
(available on both sides of set)
LFB image id 1136779
In-line connection
air supply hose
‘D’ rings
Exhalation valve
and cover
L
FB image id 1136795
LFB image id 1136793
Telemetry module
Cylinder valve group

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PSS 7000 EDBA set overview
In-line connection QRC
Waist belt
LFB image id 1136771
FPS 7000 dual purpose face mask
Inner mask
Lung demand valve, first breath
button and additional flow button
Second person connection QRC
Bodyguard 7000 user interface unit
(display), DSU button and low
pressure warning device
Padded shoulder harness
EDBA 6.8 x 2 cylinder pack and
cylinder cover
BA personal line, escape hood and
BA cable cutter
Second person connection
and Bodyguard 7000 air
supply hoses
‘D’ ring for attachment of
guide line bag and personal
line karabiner –(available on
both sides of set)
LFB image id 1136768
In-line
connection air
supply hose
Cylinder valve
group
Exhalation
valve and cover
LFB image id 1136773
Telemetry
Module
LFB image id 1136774
‘D’ rings

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2Component parts
2.1 The PSS 7000 –component parts
(a) Front view SDBA
1. Bodyguard 7000 user interface unit (display).
2. SDBA entry control tally (yellow).
3. Second person connection QRC.
4. Second person hose retaining clip.
5. Cylinder retaining strap and securing mechanism.
6. In-line connection QRC.
7. FPS 7000 dual purpose face mask.
8. Lung demand valve (LDV).
9. Waist belt adjustment buckles.
10. Waist belt buckle.
11. BA personal line housing, karabiner attached to small ‘D’ ring.
12. Backplate incorporating telemetry module.
13. First stage reducer incorporating cylinder connection.
14. Medium and high pressure hoses.
15. Waist belt ‘D’ring for attachment of guide line bag and BA team personal lines.
16. Second person connection hose.
LFB image id 245590
13
14
12
15
11
15
9
10
16
1
3
4
5
6
7
8
9
10
2

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(b) Rear view (face mask removed for clarity)
17. 3-point height adjustable, lightweight, high strength, carbon composite backplate.
18. Integrated hose channels.
19. Sliding and swivelling waist belt.
20. Rechargeable battery pack.
21. Pressure sensor housing.
22. Padding material; high wear resistance and high grip properties.
23. Shoulder strap adjustment buckles.
24. Hose sleeves on shoulder harness to reduce snagging and are reflective:
(a) Leading to FPS 7000 face mask.
(b) Leading to Bodyguard 7000.
Note: the second person connection hose must not be roved under the hose sleeve as this
would disable its quick release.
25. Electronic monitoring unit (EMU).
LFB image id 245588
21
18
19
22
25
20
24 a
17
24 b
18
23

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(c) Front view EDBA to indicate differences from SDBA
26. Lower cylinder connection guide.
27. EDBA entry control tally (red).
28. Upper cylinder retaining bracket incorporating spring clip.
29. Red sleeve to in-line connection hose.
30. Floating first stage reducer.
LFB image id 1136775
27
29
26
30
28

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LFB image 245591
LFB image 245570
3Backplate assembly
General
3.1 The height adjustable, and articulating backplate assembly, provides the wearer maximum
comfort and ease of use, resulting in reduced wearer fatigue. The backplate assembly consists of
three elements:
1. The adjustable shoulder yoke.
2. The backplate.
3. The waist belt pivot slide assembly.
3.2 Each of the elements is manufactured from a moulded
carbon composite material, providing an anti-static,
lightweight and durable system.
3.3 The adjustable shoulder yoke has two guide arms that
locate, and slide, in the two channel slots in the rear of
the backplate.
3.4 At the base of the backplate is the waist pivot slide
assembly. This unit is assembled to a spring loaded
vertical slide that is guided in a vertical slot in the
backplate.
3.5 Two compression springs, in the slide assembly, act against the slide and pivot slide assembly to
hold the unit at the top of the slide.
3.6 When wearing the BA set, the waist pivot slide assembly slides, and pivots, in response to the
twisting and bending movements of the upper body of the wearer. This flexibility improves the
weight distribution, and provides freedom of movement and increased manoeuvrability for the
wearer.
3.7 For maximum comfort and improved weight distribution adjust the
shoulder straps to allow the BA set waist belt to be positioned
comfortably on the hips so that weight is taken through legs.
3.8 A twin hook arrangement, moulded at the base of the SDBA backplate,
provides a positive mounting for the body of the pressure reducer.
3.9 Located in the recess behind the twin hook is a pre-loaded coiled return
spring. The spring latches onto an extended portion (lug) on the body
of the pressure reducer, securing the reducer assembly in its twin hook
location.
3.10 A degree of pivotal movement of the reducer is possible to allow for the
alignment of the hand wheel of the reducer to the cylinder valve.
3.11 The EDBA reducer is not mounted to the backplate.
3.12 A rubber shock buffer, at the base of the backplate, provides additional
impact protection.
3.13 Side handles, incorporated into the backplate moulding, allow for the
BA set to be easily carried (without cylinder attached).
3
2
1

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LFB image 245544
LFB image 245546
Short Medium Long
LFB image 245554 LFB image 245552 LFB image 245550
2
3
1
4
4
2
Adjustment
3.14 Three pre-set height settings are available to suit the body length of the individual wearer (‘S’ -
short, ‘M’ - medium, ‘L’ - long), and these associated letters are embossed along the guide arms
of the shoulder yoke.
3.15 A locking mechanism for the shoulder yoke is located at the rear
of the backplate and consists of two spring loaded buttons.
3.16 Body length adjustment is achieved by using the finger and
thumb to open the locking mechanism buttons, and then sliding
the shoulder yoke to align the buttons with the required ‘letter’.
3.17 Releasing the buttons will allow them to retract and locate into the
slots in the guide arms when an audible ‘click’ will be heard
locking and securing the shoulder yoke to the required height
setting.
3.18 This adjustment is carried out during ‘A’ and ‘B’ testing if
required.
4Harness and cylinder strap assembly
4.1 The harness arrangement consists of the following:
1. Left, and right shoulder padding with slide lock
buckle, hose retaining flap –button locking.
2. A pair of adjustable (pull-down) shoulder
straps connected to the slide locks buckles of
the shoulder padding.
3. A pair of waist padding elements with a buckle
arrangement fitted to the slide lock buckles
strap.
4. A pair of adjustable (pull forward) waist belt
straps with a push-in quick release buckle set.
4.2 The inner padding is produced from a flame
retardant, closed cell, fully vulcanised Polyolefin
foam. The inner liner is then covered with outer
layers of woven polyester covered with
Neoprene. The outer edges are covered with a
stitched binding of the same material as the outer
layer.

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4.3 The material of the hose retaining flaps is a double coated Neoprene Polyester plus a ‘Scotchlite’
reflective outer printed with a photo luminescent pattern and a blue Dräger logo.
4.4 The cylinder strap is fitted to a unique ‘Camlock’ buckle that ensures that the cylinder is securely
clamped to the backplate. A rubber cradle assists in alignment of the cylinder prior to clamping
4.5 All straps, adjusting straps, and the cylinder securing strap are manufactured from black Kevlar
webbing that meets the flame test requirements of EN137: 2006.
5Telemetry module
5.1 The PSS Merlin telemetry module is a battery-powered unit
incorporating an integral digital radio transmitter/receiver
with an external antenna. The integrated assembly is able to
transmit and receive audible and visual alarm signal data to
and from the PSS Merlin entry control board (ECB). The
unit is programmed with an identification number (London
Fire Brigade ID is 028) and an individual telemetry module
identification number.
5.2 The module is permanently attached to the backplate of the
BA set and is only interchangeable by Operations Support
Group (OSG).
5.3 Power is supplied by a rechargeable battery pack located in
the backplate of the breathing apparatus. An in-cab charger
provides charging via a charging port incorporated into the
telemetry module.
5.4 Supplied with each module is a matching BA entry control
tally which is encoded with the same identification number
as the module. A label on the tally shows the brigade name,
the telemetry module identification number and three
headings that allow the following information to be added
using a ‘Chinagraph’ pencil:
•The rank and name of the wearer.
•The cylinder pressure.
•The actual entry time into the risk area (using the clock of the ECB).
5.5 Where a radiation risk may be present, a dosimeter reading can be recorded on the reverse side
of the tally (prior to entry and after exit).
5.6 The BA tally must stay with the BA set when the set is sent in for repair/service as it is linked with
the telemetry module (the tally and telemetry identification numbers must match to ensure that
the telemetry module links with the ECB that the tally is placed into).
6Charging BA set from appliance
6.1 BA sets must be connected to appliance charging points to maintain a fully charged battery pack.
All BA stowage are fitted with charging points, the components can be identified as follows:
•Drager in-cab charger fitted to locker stowage in this example (see image 1136764).
•Charging lead located to the left side of the stowage (see image 248635).
Tally number
Module number

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LFB image 1136764
LFB image 248635
LFB image 245584
LFB image 1136763
Battery charging quarter charged
Battery charging fully charged
6.2 The BA set must be shut down and the Bodyguard switched off when connected to the
charging point. This ensures that the BA set is not searching for the ECB which can overrun the
charging supply.
6.3 The charging lead connector push-fits into the BA set charging port. The port is located to the left
side of the telemetry module as you wear the BA set (see image 245584). To connect the lead,
place the BA set in front of stowage position. Push-fit the connector with the charging lead
uppermost (see image 1136763). The BA set can now be pushed back into the stowage and
checked to ensure it is securely held. The connector will automatically disconnect when the BA
set is removed from the BA set stowage bracket.
6.4 Once connected the Bodyguard will carry out a short test sequence before displaying the
‘charging’icon. The radial arc indicates the level of charge in the same way as it shows the level of
pressure when the BA set is being worn (see image below).
6.5 A guide to the applicable defect codes for BA set stowage and charging points can be found in
appendix 7 of this policy.
6.6 The battery pack also indicates charging state via a coloured LED located to the top right hand
corner of the battery pack. The table below is a guide to LED status.
Battery pack LED
status
Description
Action
Solid green
Fully charged (maintenance charge).
Leave on charge.
Single flash green
Charging (fast).
Leave on charge.
Double flash green
Fault, battery temperature too high or
too low.
Remove from charge. Leave
approximately 30 minutes for

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temperature to stabilise and
then charge.
Solid amber
Was fully charged but now battery
drained.
Check BA set is shut down
correctly and the air is
purged. Remove charger and
refit. If the problem persists
contact OSG.
Single flash amber
Charging (fast) low capacity.
Leave on charge.
Double flash amber
Fault, Battery low capacity or battery
temp may be too high or too low.
Remove from charge. Leave
approximately 30 minutes for
temperature to stabilise and
then charge.
7FPS 7000 dual purpose face mask
Face mask identifying features
LFB image 201850
Head harness
Sliding buckle
Mask body
Visor
Inner mask
ESA
connection
Exhalation
valve cover
Neck loop

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7.1 The standard size combination of face mask and inner mask fitted to the PSS 7000 BA set is a
medium mask ‘M’with a size ‘2’inner mask –‘M 2’.
7.2 If a seal cannot be achieved using this combination of face mask and inner mask, the wearer
(following a face fit arranged through OSG) will be given either the S (small), M (medium) or L
(large) face mask and 1, 2 or 3 inner mask combination as appropriate. This will be issued on a
personal basis and will be recalled on an annual basis for testing.
7.3 Personal issue face masks that become defective during weekend and or night duties are to be
removed from service and a POMS order raised. Personnel affected are to remain on the run and
allocated duties that do not involve the wearing of BA. This is however limited to the extent that a
minimum of two BA wearers (excluding the appliance commander but not excluding the driver)
are available on the appliance. Should BA wearer availability drop below two, an appliance will
then be considered ‘off the run’(OTR) for BA.
7.4 The log book ‘remarks’section should be annotated with the personal issue face mask
identification number when fitted as part of BA set testing when carrying out ‘A’ and ‘B’ tests.
A 28 day test can be carried out with a personal issue face mask see section 18 for details.
7.5 The FPS 7000 DPFM can be fitted with a P3 particulate filter to protect personnel from the effects
of exposure to airborne particulates.
7.6 The FPS 7000 face mask can be fitted with a hot cutting visor for cutting operations carried out by
fire rescue unit (FRU) qualified personnel, see Policy number 799 –Broco exothermic cutting
equipment –technical information.
BA face mask seal and the acceptable limits of facial hair.
7.7 The importance of obtaining an effective face mask seal should not be underestimated. Factors
such as individual face shape and size together with the presence of facial hair can affect face fit.
Poor face fit introduces the potential for inward leakage and exposure under extreme use,
together with the potential for outward leakage with consequent reduced duration.
7.8 The face mask seal has been defined by the manufacturer as that area of the face mask in contact
with the face. The inner mask is designed to manage the build-up of CO2in the face mask. The
face mask seal is made up of a ’double reflex seal’ that by design and function is considered
safety critical to the respiratory protection of the wearer. The area within the yellow lines
shows the defined limits of the double reflex seal (see image 389147 below).
LFB image 389147
7.9 For their own safety and in accordance with the manufacturer’s and Health and Safety Executive
(HSE) recommendations, all potential BA wearers are to maintain all areas of the face that may

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come into contact with the face mask double reflex seal, in a clean shaven condition and free
from beard, stubble and sideburn hair.
7.10 The HSE advise, and past fire brigade experience shows, that sweating can cause face masks to
slip. This increases the chance that the mask will come into contact with facial hair etc. Facial
hair is an avoidable hazard; all firefighters trained in BA must remain clean shaven. Hair, (facial
or head) or any adornment in contact with the face mask seal has the potential to impair the
efficiency of the seal and compromise the respiratory protection of the wearer, and must be
removed.
7.11 Cosmetics/sun tan creams must not come into contact with the face mask rubber seal as this
degrades the rubber and may affect the quality of the seal. See Policy number 320 - wearing of
uniform and personal appearance (section 8) for further details.
8Lung demand valve (LDV)
Operation of the LDV
8.1 Before opening the cylinder valve, the first breath
mechanism must be operated. To do this press the
green first breath button on the top of the LDV which
will lift and lock the main pivot lever and diaphragm
(see image right).
Warning: do not try to operate the first breath
button (on top) and the ‘additional flow’ button (at
the front) simultaneously. This will result in
damage to the LDV and may render it
inoperative.
8.2 The conical compression spring in the main chamber of the balanced piston unit, acts against the
piston flange resulting in the piston cone being pressed against the sealing rim of the piston
housing –sealing ‘off’ the outlet of the balanced piston unit.
8.3 On opening the cylinder valve, medium pressure air flows from the reducer, through the medium
pressure hose of the LDV, into the air transfer block then into the main chamber of the balanced
piston unit.
8.4 When the wearer begins to inhale a negative pressure is created inside the mask and LDV. Due
to the negative pressure, the ambient air pressure acts against the diaphragm.
First breath
button
Additional flow
button

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8.5 As the diaphragm deflects, it then presses against the main hinged lever of the balanced piston
unit resulting in the release of the positive pressure ‘off’ mechanism.
8.6 Increasing deflection of the diaphragm, during inhalation, pivots the cam of the main lever against
the secondary lever.
8.7 The secondary lever then pivots and presses against the end cap of the piston –moving the
piston axially against the conical spring –lifting the piston cone from its seating and releasing air
from the LDV into the wearer’s face mask.
8.8 A compression spring attached to the front cover of the LDV acts on the diaphragm, then the
pivot levers and the conical compression spring, lifting the sealing cone and maintaining a
positive pressure (above ambient) inside the face mask.
8.9 When the wearer stops inhaling and then begins to exhale, the diaphragm, the pivot levers and
the sealing cone all retract.
8.10 This cycle repeats as the wearer begins to inhale again.
8.11 The LDV is designed to maintain positive pressure inside the mask.
Use in hi - expansion foam
8.12 For use in hi-expansion foam the outer rubber casing should be released from the body of the
LDV prior to use, see appendix 1 for details.
9Pneumatic system
First stage pressure reducer
9.1 Leading from the first stage pressure reducer are the:
•High pressure hose to electronic monitoring unit (EMU).
•Low pressure warning whistle (LPWW).
•Medium pressure hose to in-line connection with LDV hose.
•Medium pressure hose to second person connection.
•Cylinder connection.
9.2 An additional compression ‘O’ring located between the hand wheel and the flange of the high
pressure (HP) connector, functions as an anti-vibration device.
9.3 This feature prevents the inadvertent loosening of the hand wheel from the port of the cylinder
valve, during storage conditions involving vibration, when the system is not pressurised.
9.4 The reducer has two outlet ports, one providing high pressure air to the EMU, and the other
providing medium pressure air only to a ‘Y’piece which supplies both the LDV and second
person connection. The LPWW is situated in the middle port of the reducer body.
LFB image 245568
Cylinder
connection
‘O’ ring
Anti-vibration
‘O’ring

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LFB image 1136797
LFB image 1136792
9.5 Two of the hoses that connect to these ports are looped through the
central hole in the backplate and located into the respective channel in
the adjustable shoulder yoke, from which they are directed and
secured to the shoulder pads.
9.6 The hose to the second person connection is run up the left hand side
of the backplate.
9.7 The route of the hoses from the reducer, to the guide slots in the
shoulder yoke are set to allow for full and free linear movement of the
yoke during height adjustment.
9.8 Fitted to the medium pressure port is a flexible and anti-kinking rubber hose assembly.
9.9 The inlet fitting of the hose incorporates a pressure relief valve feature.
9.10 At the outlet end of the hose is a female QRC. This female QRC is used to attach to the male
coupling of the LDV.
9.11 The hose is manufactured from Ethylene-Propylene-Diene-Monomer (EPDM) rubber.
9.12 Fitted to this port is the hose assembly that supplies the EMU for monitoring the air pressure in
the compressed air cylinder.
9.13 The hose construction, although appearing similar to medium pressure hoses, differs in its
internal construction. Inside the outer EPDM rubber hose assembly is a fine bore copper capillary
tube that is coil wound around a multi-strand length of phosphor bronze wire. The capillary tube
and wire are then brazed to each of the end fittings of the capillary tube assembly.
9.14 High pressure air flows through the bore of the capillary tube to the EMU which is protected by
the rubber outer hose.
10 Second person connection
10.1 The second person connection is an additional feature fitted
to the PSS 7000 BA set. The second person hose is
connected at one end to a ‘Y’ piece on the reducer and
terminates at the other end with a QRC and protective cap.
The purpose of this hose is to provide the ability to either
supplement the wearer’s air supply with an airline or to
provide another wearer with additional air during exchange
of air procedure (see image 1136797).
LFB image 202449
Medium pressure
hose to in line
connection
Medium pressure
hose to second
person connection
High pressure
hose to EMU
LPWW
Cylinder
Connection

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LFB image 245574
LFB image 245578
LFB image 245576
10.2 The hose to second person QRC is 900 mm long and when charged contains medium pressure air
(between 6 and 9 bar) from the reducer to the QRC.
10.3 Once the second person connection has been made the second person hose can be released
from its retaining clips. To release the hose the recipient takes hold of the QRC and pulls
outwards to donor’s left hand side, this action will release the hose without any undue pressure
being applied to the hose retaining clips.
10.4 When fully unclipped, the 900 mm of hose and the additional 400 mm from the donor’s face
mask hose will enable the two attached BA wearers greater flexibility when withdrawing from an
incident.
10.5 The second person hose is secured to the BA set at three
points along its length by dedicated retaining clips.
•The second person hose passes up the left side of the
BA set backplate. The first hose clip should be clipped
to the side of the backplate carry handle, the open side
of the clip points upwards towards the cylinder. The
second person connection hose can then be pushed
into the clip (see image 245574).
•The second person hose continues over the left
shoulder padding, outside the hose sleeve and to the
left of the Bodyguard supply hose. The second hose
clip, is positioned on the top of the left shoulder
padding. The clip should be attached to the underside
of the Bodyguard supply hose so that you can still see
the hose. The second person hose can then be pushed
into the clip from the left hand side (see image 245578).
•The third hose clip is positioned by attaching the
retaining clip to the harness webbing loop and then
pushing the Bodyguard hose into the clip so that the
hose can still be seen. The second person hose can then
be pushed into the clip from the left hand side (see
image 245576).
10.6 It is important that the second person connection hose clips
are fitted correctly to ensure the hose is held securely until
required.
10.7 The above section has provided an overview of the
capability of the second person connection and wearers
should remember that where possible they should stay in
close personal contact and follow the correct exchange of
air procedures as per Babcock training module BA 017 –Emergency Procedures found on Big
Learning.
Note: when donor and recipient BA wearers revert back to their own BA set air supply, the
donor’s second person connection hose must be clipped back into place using the three clips on
their BA set. Failure to do this may result in increased risk of entanglement and potential damage
to the second person connection hose and QRC.

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11 Bodyguard 7000 electronic monitoring unit
(EMU)
Components of the Bodyguard 7000 EMU
1. Bodyguard user interface unit (display).
2. Bodyguard/BA tally key.
3. High pressure hose to reducer.
4. Pressure sensor housing.
5. Electronic monitoring unit (EMU).
6. Battery contacts.
7. Rechargeable battery pack.
11.1 The Bodyguard 7000 EMU comprises of an electronic pressure
transmitter module, a user interface unit (display) and a rechargeable
battery pack. A short high pressure hose which is routed from the high
pressure sensor housing of the electronic pressure transmitter module
connects to the high pressure outlet of the pressure reducer of the BA
set.
Component parts of Bodyguard user interface unit
Note: the Bodyguard key can be inserted into either side of Bodyguard user interface unit.
Description and use
11.2 The Bodyguard user interface unit (display) features a digital screen for viewing the cylinder
pressure (in numeric and radial segments), scrolling of user details (BA identification), the time to
warning (TTW) (numeric), and the display of various warning icons.
11.3 The electronic functionality of the unit is activated to operational mode by the system cylinder
pressure of the BA set, via the pressure sensor incorporated in the pressure transmitter module
located in the inside of the frame of the backplate.
11.4 This multi-function system provides continuous monitoring of the BA set and incorporates the
following features:
•Monitoring the available air pressure of the compressed air cylinder.
•Time to warning (TTW) –numeric display.
•Time of warning (TOW) –indicated by flashing LEDs and audible warning.
•Visual –LED indicators –(green –operational mode, key removed, red/blue –warning mode
and blue –telemetry signal).
•Motion sensor and automatic distress signal unit (ADSU).

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•Button activated manual distress signal unit (DSU).
•A ‘backlight’ – illuminating the display.
Pressure transmitter module
11.5 Pressure connection –pressure sensor (see paragraph 9.14) for connection to the high
pressure outlet port of the first stage pressure reducer via a high pressure connection hose (see
image 245556).
11.6 Outlet connection –hose/cable link to the Bodyguard unit.
Rechargeable battery pack
11.7 The rechargeable battery pack cannot be changed at station. If
a ‘reduced battery’icon is displayed investigate why i.e. is the
charging lead connected or is the charging point defective on
the appliance, try changing the set position to see if the
charging icon is displayed on the Bodyguard display:
•Main power –6.5 volts.
•The Bodyguard is powered by a 6.5 volt rechargeable battery pack.
•Actual operating time of the battery pack is dependent on how long the system has been
operating, frequency of alarms, ambient temperature and frequency of use of the backlight.
•With the system switched ‘off’ a small amount of power is still consumed.
•Note: All electronic devices may suffer a temporary loss of function if subjected to high levels
of radio frequency (RF) radiation.
•The Bodyguard will continue to operate with no loss of performance or loss of function, once
the RF radiation has been removed.
12 Bodyguard in use functions
Display –operating mode
12.1 The Bodyguard user interface displays cylinder pressure and TTW. The upper
numeric value and radial segments indicate cylinder pressure (see image right).
12.2 The lower numeric value indicates the TTW and the activation of the visual
LEDs.
12.3 The display alternates between TTW and telemetry signal status at
approximately five second intervals (see image right ‘telemetry signal radio’
icon ticked for ‘in’ telemetry signal).
12.4 The green LED on the front of the display unit flashes at one second intervals when in
‘operational mode’.
12.5 The two blue LEDs on the front of the display unit flash at one second intervals
when ‘in’ telemetry signal.
12.6 The EDBA set Bodyguard also features a first alert, this is indicated at 192 bar
by two short ‘bleeps’ and is an indication that 50% of the available working duration of the EDBA
set has been reached.
Backlight
12.7 To illuminate the display –briefly press the left button. The display will illuminate for ten
seconds.
LFB image 245556