Dräger PSS 7000 Reference Manual

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N A R U E D U C AT I O N C E N T R E

BAI GUIDE

Dräger Personal Safety
System (PSS) 7000

The Dräger PSS 7000 is a self-contained, two staged, open circuit,

1.0

positive pressure, compressed air breathing apparatus set which
conforms to EN136, EN137 & EN144.

Self-contained
Two-stage
Open-circuit
Positive

pressure

Compressed
Air
Breathing

apparatus

Component parts:

Notes

DRÄGER (PSS) 7000

Back plate assembly.

Harness and cylinder bracket
arrangement.

Dräger PSS 7000 SCBA Set, conforms
to EN137 and to the requirements of
EC Council Directive 89/686/EEC,
BSEN 133.

Hose lines.

The equipment is CE Mark Approved

Reducer.

Lung Demand Value.

Facemask.

and is issued with an EC Type Examination
Certificate: CE0359.

Dräger FPS 7000 (facemask) conforms
to EN136.

Bodyguard 7000.

Dräger Compressed Air Cylinder Valves

Cylinder valve and cylinder

conform to the EN144; CE0589.

of compressed air.

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1.0

Back Plate Assembly

The back plate assembly consists
of three elements:

1

The Adjustable Shoulder Yoke ­ (‘S’ - Short, ‘M’ - Medium, ‘L’ - Long).

DRÄGER (PSS) 7000

1

The Waist Belt Pivot Slide Assembly -

2

improves the weight distribution and
manoeuvrability for the wearer.

3

The Back Plate.

With these three elements, the back
plate works on the Bergen principle
of transferring 2/3 of wearers weight
onto the waist belt.

Conforms to EN 137: 2006.

2

Ergonomically designed.

02

3

Anti-Entanglement Strap Carry Handle

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Rubber buffer at the base of the
system provides additional impact
protection.

Highly resistant to chemicals.

N A R U E D U C AT I O N C E N T R E

BAI GUIDE

1.0

Flame retardant.

The shoulder yoke, back plate and
waist belt pivot slide assembly is
manufactured from a moulded
carbon composite material providing
an anti-static, lightweight and
durable system.

A retractable personal line with a

5

90kg breaking strain is fitted to the
right-hand side of the set.

It is 6m in length (1.25m then a small
knot the 4.75m).

Side handles, incorporated into the
back-plate moulding channels for
hose lines enables easy carrying
even with a cylinder fitted.

4

DRÄGER (PSS) 7000

5

An anti-entanglement strap is fitted
between the cylinder and back plate
to eliminate the risk of entanglement
by closing the gap between the
cylinder and backplate.

Dual Pressure

Sensor

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1.0

Harness & Cylinder Attachment

A pair of adjustable (pull-down)

6

shoulder straps locates into the
associated slot in the base of the
back plate and is secured using
a retention peg.

DRÄGER (PSS) 7000

6

An adjustable chest strap is fitted

7

with a trident buckle.

Pivoted and sliding waist harness
with a pair of adjustable
(pull forward) waist belt straps.

'S' shaped stainless steel, anti-static,
anti-slip buckles.

8

Push-in quick release trident
buckle which is moulded with Dräger

7

name facing outwards.

04

8

Quick Release Trident Buckle

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Inner padding is flame retardant

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closed cell, fully vulcanised foam.
The inner liner is then covered with
outer layers of woven polyester
covered with neoprene.

N A R U E D U C AT I O N C E N T R E

BAI GUIDE

1.0

All straps, including adjusting straps,
are manufactured from a black material
containing 50% Kevlar webbing that
meets the flame engulfment test
requirements of EN137 and other
material: nylon and panotex.

Hose retaining flaps are made from
double-coated neoprene polyester,
plus a reflective outer printed with a
photo-luminescent pattern and blue
‘Dräger’ logo.

DRÄGER (PSS) 7000

Cylinder Attachment

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1.0

First Stage Reducer and Cylinder Connector

The reducer is
factory set and

Mechanical
whistle

sealed and

Bronze

must not be

sintered

DRÄGER (PSS) 7000

tampered with

filter

Nitrile

Reducer

Anti-tamper

disk

Reducer is made from nickel plated
marine brass and has a ten - year
service life.

Designed to reduce the compressed
air in the cylinder (200-300bar) down
to 6-9 bar and can deliver 1000 l/min.

At 20 bar it can deliver 550 l/min.

At 10 bar it can deliver 300 l/min.

Two outlet ports, one providing dual
high and medium pressure air to
Bodyguard
providing medium pressure to LDV.

®

7000, and the other outlet

At the outlet end of the hose is a
female quick release coupling (QRC)
that is used to attach the male coupling
of the lung demand valve (LDV).

Dual High Pressure Port - Fitted to
this port is the unique dual function
hose assembly that incorporates the
in-line whistle warning unit, (high
pressure activated - medium
pressure operated), and a high
pressure (HP) contents gauge for
the monitoring of the air pressure
in the compressed air cylinder.

O-ring

Cylinder
Connector

06

Medium pressure port incorporates
a pressure relief valve that operates

Cylinder Connector

Chrome plated marine quality brass.

between 11-16 bar and dumps
400 l/min.

The dual pressure port (medium and

Contains a nitrile O-ring.

Pivots to ease attachment to cylinder.

high pressure) feeds the warning
whistle unit (WWU) which activates
at 55 (+/- 5 bar) and sounds at 90dBA.

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N A R U E D U C AT I O N C E N T R E

BAI GUIDE

Flow of Air

Cylinder pressure of 300 bar flows through the anti-debris tube containing a
sintered bronze filter and through the cylinder valve at a 90º angle into the
pressure reducer which reduces velocity.

The HP side of the system is protected
by a choke screw that restricts the
airflow to a maximum of 25 l/min if
damage to supply hose occurs.

HP air enters the reducer, closes and
seals the piston of the whistle activation
mechanism against the seat. This
pressurises the capillary tube in the
dual pressure hose and activates the
pressure sensor of the Bodyguard®­turning ‘On’ the unit - passes into the
piston bore - past the piston seat and
pre-set plunger and into the MP chamber.

As air is deflected across the plunger
it is reduced to 6-9 Bar (passes from
a small area to a larger area).

As the pressure increases in the MP
chamber, it forces the piston to move
axially against the compression
spring until the piston seat contacts
the end face of the plunger - sealing
off the high pressure air.

On inhalation, from the LDV, the air
is drawn from the medium pressure
chamber and as the pressure reduces
in the chamber, the compression
spring retracts the piston - moving
the piston seat from the end face of
the plunger. The HP air then again
begins to enter the medium pressure
chamber - repeating the cycle.

Consumption of air from the
cylinder(s) reduces the available
pressure, and at a pre-set pressure
the compression spring in the whistle
activation mechanism retracts the
HP plunger from its sealing seat –
releasing air from the medium
pressure chamber and into the
whistle activation chamber.

A pressure relief arrangement is
incorporated in the pneumatics
system at the MP outlet from the
reducer. In the unlikely event of an
HP leak into the MP side of the
system, causing an ‘over pressure’,
the relief valve will open between
11bar - 16bar to vent pressure
This safety feature ensures that MP
air is maintained to the LDV and
subsequently to the wearer.

When the wearer begins to inhale a
negative pressure is created inside
the facepiece and lung demand valve.

-1 to -25 bar. Due to the negative
pressure the ambient air pressure
acts against the diaphragm. 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.

1.0

DRÄGER (PSS) 7000

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1.0

Increasing deflection of the
diaphragm, during inhalation, pivots
the cam of the main lever against
the secondary lever. The secondary
lever then pivots and presses against
the end cap of the piston - moving the
piston axially against the conical

DRÄGER (PSS) 7000

spring - lifting the piston cone from
its seating and releasing air from
the lung demand valve into wearer’s
face piece.

A compression spring attached to
the front cover of the lung demand
valve 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 piece.

When the wearer stops inhaling then
begins to exhale, the diaphragm,
pivot levers and sealing cone retract.

This cycle repeats as the wearer
begins to inhale.

Hose Lines

Non – kinking, manufactured from
EPDM ( Ethylene-Polpylene-Diene­Monomer ) rubber and re-enforced
stitching.

Medium pressure hose supplies 6-9
bar to the LDV and supplementary air
attachment. They are flexible, have
free head movement, will not collapse
and will not restrict or close the air
supply when trapped.

Dual hose 200-300 bar from the
reducer to the Bodyguard.

Inside the outer EPDM rubber hose
assembly; that attaches to the
Bodyguard®; 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.

High pressure air flows through the
bore of the capillary tube to the
pressure gauge (or Bodyguard®7000)
via a transducer and not through the
rubber hose.

08

The LPWW will activate at 55 bar
+/- 5 bar and is louder than 90 dBa.
This uses 3.8 lpm of air.

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N A R U E D U C AT I O N C E N T R E

BAI GUIDE

Supplementary Air Supply

The PSS7000 is fitted with a secondary hose attachment to allow for further
extension of the wearers air.

Comprising of male and female connectors covered by protective caps.

1.0

DRÄGER (PSS) 7000

Male
Connector

Female
Connector

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1.0

Lung Demand Valve

Green/red button = reset (close circuit)

DRÄGER (PSS) 7000

Black button = depress activates free flow

LDV manufactured from glass-filled
nylon which provides a high degree
of strength and durability.

Rubber shroud covers the mechanism.

Mechanism consists of a balanced
piston assembly, banjo spindle spring
lever and a silicon diaphragm
(red button) or rubber (CBRN - green).

Operates on first breath principle.

Operating pressures:

First breath = -1 to -25 m/bar
Reduced into mask = 1 to 3.9 m/bar
Activate exhalation valve = 4.2 to

5.7 m/bar

Has a type A push-in connector to
the face piece (‘P’ connection).

Red/ Green button = reset (close circuit).

Black button = (depress for
supplementary air supply).

Once connected to the front port of the
facemask the LDV can rotate,
accommodating changing orientations
of the wearer. In addition, the medium
pressure connection to the LDV by
means of a swivelling banjo allows
another degree of freedom. The end
result is that the LDV and hose will
remain streamlined with the body.
The balanced piston assembly and banjo
spindle spring lever work in conjunction
to allow the flow of air dependant on the
wearer inhaling or exhaling.

10

Able to deliver 500 LPM.

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N A R U E D U C AT I O N C E N T R E

BAI GUIDE

FPS 7000 Face Mask

Double facemask seal:

Inner sealing line combined

with an external sealing

surface for highest safety

Inner mask:

Available in

different sizes

1.0

Harness:

Ergonomically shaped and
easy to lock in place

DRÄGER (PSS) 7000

Visor:

Made of very durable
polycarbonate with
anti-scratch coating

Connector:

Different connector variations

with backward compatibility

to existing systems

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Mask body:

Ergonomically shaped and
available in three sizes (S, M, L)

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1.0

The Facial Protection System (FPS)
7000 conforms to EN136 and
gives 70% vision.

There are two sizes of spider harness:
small and medium/large

Incorporates speech diaphragm.

Rubber on the facemask is
hypoallergenic.

Made from neoprene with a double
reflex seal to help prevent air leaks.

DRÄGER (PSS) 7000

Speech diaphragm.

Large, distortion free, anti-scratch
polycarbonate visor which is heat
and impact resistant for distortion ­free vision and distributes air evenly
to avoid fogging.

Grade 1 heat and impact resistant.

Available in three sizes, small,
medium/large and large.

Inner Mask

Oral-nasal inner mask made
of neoprene.

Consists of two mushroom valves

Push connector for LDV.

9

Neck strap consists of standby button
to hold facemask in a secure and safe
manner whilst the facemask is not
being worn.

Breathing Cycle P-connector
(positive pressure)

Inhalation:

By lung demand valve delivered air
enters via inhalation valve.

Flushing of the visor.

Control valves open.

Arriving of the air inside the inner
mask via the control valves.

Exhalation:

Inhalation valve closed.

Control valves closed.

to allow intake of cylinder air and
reduces on dead air space which
prevent the build-up of carbon
dioxide and condensation forming
inside the mask.

Spring-loaded exhalation valve
opens in the chin area.

Exhaled air releases to surrounding
atmosphere.

12

Three sizes of oro-nasal inner
mask 1,2,3.

Additional Features

Robust push-to-connect design
which allows 360⁰ rotation of lung
demand valve (LDV).

5-point spider head harness with
stainless steel buckles to secure the
mask around the wearers head.

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N A R U E D U C AT I O N C E N T R E

BAI GUIDE

FPS 700 Face Mask

Weighs approximately 600g

Oro-nasal
mask

1.0

9

DRÄGER (PSS) 7000

NOTE:
Silicone facemasks do
not have CBRNE type
approval (BS 8468-1)
and must not be worn
at these incidents.
Silicone facemasks can
however be worn when
deploying in GTS to a
CBRNE incident.

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Stand-by Button

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1.0

Bodyguard®7000

Digital

Display Unit

DRÄGER (PSS) 7000

Bodyguard®Key

The Dräger Bodyguard®7000ET (Electronic Tally)) is an electronic monitoring unit
which provides continuous monitoring of personal information and operational status
of the Dräger PSS®7000 self-contained breathing apparatus and conforms to EN137.

This multi-function system incorporates
the following features for providing
continuous monitoring of the BA set:

Monitoring of available air pressure
of the compressed air cylinder.

Time to whistle (TTW).

Visual - Light Emitting Diodes
(LED’s) Indicators.

Button activated manual Distress
Signal Unit (DSU).

Operation of running man.

A backlight feature - illuminating
the display.

Personal ID - Optional, if enabled.

The temperature monitoring facility is
not present on the Bodyguard®7000.

Hours of recorded info.

Movement Sensor and Automatic
Distress Signal Unit (ADSU) –
numeric display.

The tally version of the Bodyguard®7000
is switched ‘On’ by the sensing of the
system cylinder pressure of the SCBA.

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The Automatic Distress Signal Unit (ADSU)
will sound if no motion detected for
21 – 25 secs. The sound increases in
volume, and backlight flashes. If motion
is sensed within a further 8 secs alarm is
reset, if no motion is sensed, full alarm
is activated and a high-pitched audible
alarm emitted with two blue, and red
LEDs flashing intermittently.

The Distress Signal Unit (DSU) can be
manually activated when a wearer
requires assistance and is operated by
pressing the yellow distress alarm button
on the front of the Bodyguard®.

Incorporates electronic high pressure
warning whistle.

Power packs are available as either a
pack containing 5 replaceable 1.5 Volt
AA batteries, or as a single
rechargeable 7.2 Volt Lithium Polymer
battery pack.

Comfort light (green) must be flashing
to show that the ADSU is in operational
mode.

Blue light flashing means telemetry
has been established.

A short high pressure (HP) hose,
routed from the HP sensor housing
of the pressure transmitter unit,
connects to the HP outlet of the
pressure reducer of the SCBA.

Dual High Pressure Port - Fitted to this
port is the unique dual function hose
assembly that incorporates the in-line
whistle warning unit, (high pressure
activated - medium pressure operated),
and a high pressure (HP) contents gauge
for the monitoring of the air pressure in
the compressed air cylinder. The hose
construction, although appearing similar
to MP 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.
High pressure air flows through the bore
of the capillary tube to the pressure gauge
and not through the rubber hose.

Constructed as part of the dual pressure
hose assembly, and located at base of the
pressure gauge, is the in-line whistle
warning unit (WWU). The WWU provides an
audible alarm signal that begins sounding
when the available air remaining in the
compressed air cylinder has reduced to a
pre-set pressure. The released air enters
the bore of the rubber hose (via the dual
pressure port) and activates the in-line
whistle warning unit. The pre-set pressure
setting of the WWU may be adjusted by the
user to meet special requirements.

1.0

DRÄGER (PSS) 7000

Yellow marking band indicates
telemetry enabled.

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1.0

Radial segments

pressure & timing

Digital cylinder pressure reading

Left hand button

Right hand button

Time to whistle

DRÄGER (PSS) 7000

Distress alarm

Tally key

button

Blue

Red

Blue

Red

Green

Hose/cable assembly to electronic
pressure transmitter module

The Bodyguard®7000 can store 33 hours of data which can be downloaded and viewed
if required. The Bodyguard®7000 can be placed in to Gas Tight Suit mode by pressing
the left hand button when this symbol appears

NOTE: THE BODYGUARD IS NOT TO BE SET TO GTS-MODE UNLESS AN EXTERNAL
DSU IS WORN

Non
Operational
Mode Icon

Motion Icon Cylinder

Ops Mode
Pressure
and TOW

Leak Test

Battery Low
Volume
Pressure &
Number Icon

Unit OK Icon

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BAI GUIDE

Nickel Metal Hydride Battery Module

The PSS7000 BA set comes with two
battery options, the rechargeable power
pack or the AAA power pack.

Rechargeable Power pack - a single
rechargeable 7.2 Volt Lithium Polymer
battery pack.

Cylinder

1.0

DRÄGER (PSS) 7000

Final resin

Carbon wrap

Aluminium liner

300 bar

in-line

valve

layer

Glass wrap

Protexal™
anti corrosion layer

Excessive flow valve/ filter

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1.0

The Dräger Twin Cylinder Pack
Assemblies are approved for use

20 year life.

Hydro-testing required every 5 years.

with the twin cylinder pack variants
of the DrägerMan PSS®7000 Twin
Series of compressed air respiratory
protection equipment.

Twin cylinder packs consist of two
compressed air cylinders aligned and
secured in tandem onto a central
support strut by a pair of stainless

2x 300bar, 6.8 litre cylinders.

DRÄGER (PSS) 7000

Combined compressed air capacity
of 3672 litres.

Ultra-lightweight, carbon composite
cylinders.

steel straps.

The valves can be either ratchet or
non-ratchet activation and positioned
either, facing the wearer (inboard) or
away from the wearer (outboard).

Aluminum shell with Protexal anti
corrosion layer.

Over wrapped with carbon and glass
fibres, epoxy resin matrix.

External layer of glass fibre is applied
to enhance the resistance of the
cylinder to impact and abrasion.

External gel coat is applied to the
surface of the cylinder which provides
a smooth, easily cleaned surface.

Conforms to EN12245:2009.

Weight of cylinder pack approx 12kg.

From the selected valve body, a high
pressure stainless steel capillary
tube bridges across and connects to
the second cylinder. The capillary
arrangement is shrouded and
protected by a split moulding that
forms a convenient carrying handle.

Two connector nuts (top and bottom)
attached to the central strut are used
to locate the twin cylinder pack
assembly to the mounting
arrangement on the backplate of
the compressed air respiratory
protection equipment.

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Cylinder Label

Cylinder Label (including date of first re-test) Example re-test label

Cylinder Valve

1.0

DRÄGER (PSS) 7000

Excessive

flow

valve/ filter

The Dräger Valves conform to EN144.

In-line and right angled cylinder valve.

Constructed of chrome plated
marine brass.

Turn anti-clockwise to open.

Pull out and turn clockwise to close.

Spring loaded ratchet system
preventing accidental shut down.

Glass filled nylon hand wheel.

Anti-debris tube containing 80 micron
sintered bronze filter.

Extended Duration Breathing Apparatus (EDBA) Instructor Reference Guide - February 2018, Version 1.0

@

NARU_Education

www.narueducationcentre.org.uk

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1.0

What is an EN number?

The European Committee for Standardisation (CEN) develop and publish European
Standards (EN). Standards are documents that set out specifications and other technical
information with regard to various kinds of products, materials, services and processes.

These standards provide a basis for mutual understanding among individuals,

DRÄGER (PSS) 7000

businesses, public authorities and other kinds of organisations. They facilitate
communication, commerce, measurement and manufacturing.

European Standards can be used to enhance safety and performance, improve energy
efficiency, and protect consumers, workers and the environment. They complement
European and national policies, and make it easier for businesses and other actors to
respect relevant legislation.

One European Standard replaces 34 national standards

The Members of CEN are the National Standardisation Bodies of 34 European countries –
including all the member states of the European Union (EU) and other countries that are
part of the European Single Market.

European standards are developed by teams of experts who have particular knowledge
of the specific sector or topic that is being addressed. Each National Standardisation
Body that is part of the CEN system is obliged to adopt each European Standard as a
national standard and make it available to customers in their country. They also have to
withdraw any existing national standard that conflicts with the new European Standard.
Therefore, one European Standard (EN) becomes the national standard in all 34 countries
covered by CEN Members.

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© National Ambulance Resilience Unit (NARU). ECBAI01V1.0, February 2018.

Extended Duration Breathing Apparatus (EDBA) Instructor Reference Guide - February 2018, Version 1.0

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NARU_Education

www.narueducationcentre.org.uk