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Bodyguard
®
7000
Electronic monitoring system
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4.5.5 Retreat alert and time to retreat
Retreat alert is an alternative warning protocol that can be used if it is
applicable in the country of use. When configured for retreat alert, the
system calculates a retreat pressure and TTR in minutes. The time to
retreat is displayed on the user interface screen with the TTR symbol .
When the cylinder pressure decreases to the retreat pressure, audible
and visible signals inform the wearer.
There are 2 retreat pressure calculation methods.
–
Initial retreat pressure
. On opening the cylinder valve, the retreat
pressure defaults to 2/3 of the start pressure. (The start pressure is
the initial pressure measured when the cylinder is opened.)
For example: a 300 bar start pressure = 200 bar initial retreat
pressure.
–
Mission retreat pressure
. At any time before the cylinder pressure
reaches the initial retreat pressure, the wearer can set an arrival
pressure at the mission arrival point. The system then recalculates
the retreat pressure as: (the start pressure minus the arrival pressure)
multiplied by 2.
For example: with a start pressure of 298 bar and an arrival
pressure of 230 bar:
(298 - 230) x 2 = 136 bar mission retreat pressure.
If the calculated retreat pressure is less than 60 bar, the system
defaults to a retreat pressure of 60 bar.
Using retreat alert
1. Open the cylinder valve.
– The initial retreat pressure is calculated, and the TTR displays
on screen.
2. At the mission arrival point, press and hold the left-hand button for
more than 3 seconds.
– The arrival symbol displays for approximately 1 second as the
system calculates the mission retreat pressure. The new TTR
then displays on screen.
3. When the retreat pressure is reached, an intermittent alarm tone
sounds and the retreat symbol displays.
4. Acknowledge the alarm by pressing and releasing the right-hand
button.
– The user interface screen changes to show TTW.
Early retreat
. To cancel the retreat alert before the retreat pressure is
reached, press and hold the right-hand button until the retreat symbol
displays. TTR cancels and the user interface screen changes to show
TTW.
5 Troubleshooting
The troubleshooting guide shows fault diagnosis and remedy information
applicable to breathing apparatus users. Further troubleshooting
information is available in instructions for use supplied with associated
equipment.
Where the troubleshooting guide shows more than one fault or remedy,
carry out repair actions in the order that they appear in the table. Contact
service personnel or Dräger if the symptom remains after all remedy
actions have been attempted.
6 Maintenance
6.1 Maintenance
table
Service and test the product in accordance with the maintenance table,
and record all service and testing details.
Refer also to the instructions for use for the associated breathing
equipment. Additional maintenance may be required in the country of use
to ensure compliance with national regulations.
6.2 Visual
inspection
Check that all parts of the product are clean and undamaged. Typical
signs of damage that may affect the operation of the product include
impact, abrasion, cutting, corrosion, and discoloration. Report damage to
service personnel or Dräger, and do not use the equipment until faults are
rectified.
6.3 Functional
testing
If the system fails to operate as described or any fault indication appears,
stop testing and see the troubleshooting information (section 5) for
remedy information.
1. Press the left-hand button.
– The self-test and start-up sequences run and the system adopts
the active mode.
2. Press and release the left-hand or right-hand button.
– The backlight illuminates for approximately 3 seconds.
3. Press the manual alarm button .
– The full alarm activates (see section 4.2.3) with the manual alarm
symbol on screen.
4. Cancel the alarm.
– Tally version: remove and refit the tally.
– Button version: simultaneously press and hold the left-hand and
right-hand buttons until the alarm stops.
5. Remove the tally.
6. Immobilize the user interface.
– After 21 to 25 seconds, the pre-alarm activates (see
7. Move the user interface to cancel the alarm.
8. Immobilize the user interface again and ignore pre-alarm.
– After approximately 8 seconds of pre-alarm the full alarm
activates (see section 4.2.3) with the automatic alarm symbol on
screen.
9. Cancel the alarm and continue to the high-pressure leak test.
– Tally version: refit the tally.
– Button version: simultaneously press and hold the left-hand and
right-hand buttons until the alarm stops.
6.3.1 High-pressure leak test
1. Ensure that the tally is fitted to prevent the automatic distress alarm
from activating.
2. Press the left-hand button to activate the start-up sequence.
3. When the leak test symbol displays, press the left-hand button.
– The open valve symbol displays and the radial segments begin
to switch off clockwise.
4. Immediately open the cylinder valve. Open the cylinder valve before
the last radial segment extinguishes or the start-up sequence restarts.
– A tone sounds, and the close valve symbol and press right-
hand button symbol alternate.
5. Immediately close the cylinder valve and press the right-hand button.
– A tone sounds, pressure stabilizing starts, the wait symbol
displays, and the radial segments extinguish clockwise.
– If the cylinder pressure is very low and falls below a preset
threshold during pressure stabilizing, the low-pressure
symbol displays briefly and the start-up sequence restarts.
– When stabilizing is complete, a tone sounds and the leak test
timing symbol displays. The radial segments extinguish
clockwise during leak test timing.
6. When timing is complete a tone sounds and the test result displays.
– Leak test pass
. Observe the following note and continue to the
whistle test.
The leak test pass symbol displays for up to 3 minutes as the radial
segments extinguish clockwise. The whistle test must be complete
before all radial segments extinguish or 5 tones sound and the start-
up sequence restarts.
– Leak test fail . Close the cylinder valve, fully vent the system,
and investigate and repair the leak (see section 5).
6.3.2 Whistle test
1. Slowly release the pressure as follows:
– Positive-pressure system: cover the outlet port of the lung
demand valve with the palm of the hand and press the front
button. Carefully lift the palm of the hand to release pressure
slowly.
– Normal demand system: press the front button to release
pressure slowly.
2. Observe the whistle activation pressure.
– The EOST alarm (see section 4.2.3) and breathing apparatus
mechanical whistle must commence in the range 60 bar to 50 bar.
The EOST alarm and mechanical whistle might not commence at
the same time due to system tolerances.
3. Continue to release the pressure slowly.
– At approximately 10 bar to 8 bar, the EOST alarm and mechanical
whistle stop.
– When the system is fully vented, the open valve symbol
displays, the radial segments extinguish clockwise, then the
screen displays 0 (zero) bar.
4. Switch off the electronic system (see section 4.4.5).
6.4 Cleaning
Clean the product as detailed in the associated breathing apparatus
instructions for use, and observe the following.
– The LCD screen has an external sacrificial screen which is a
removable clear screen. Remove and clean the sacrificial screen if
necessary.
– Remove the power pack (see section 6.5.2) and clean the power
pack, battery terminals, and backplate recess.
– After cleaning, reassemble the parts and carry out the functional
– Contact service personnel or Dräger if further disassembly or more
thorough cleaning of the product is required.
6.5 Power
pack
6.5.1 Power pack types
Power pack with 5 replaceable 1.5 V batteries
– Used with non-telemetry versions only.
– The estimated battery life is approximately 12 months based on
1 hour use per day
1)
.
– The power pack is supplied with the batteries fitted.
Power pack with a single 6.5 V rechargeable battery
– There are 2 versions of the rechargeable power pack.
– The telemetry version (Fig. 5, Item 1) has a slotted securing
screw. This version is only fitted to telemetry (PSS
®
Merlin
®
)
breathing apparatus. The estimated battery life is approximately
8 hours between recharges
– The non-telemetry version (Fig. 5, Item 2) has a hexagonal socket
head which is fitted with an anti-tamper plug. This version is only
fitted to non-telemetry breathing apparatus. The estimated battery
life is approximately 50 hours between recharges
– The power pack is not fully charged when supplied. Charge the power
pack before use (see section 6.5.5).
– Dräger recommend a battery health check every 6 months. A Dräger
4-Way Charger is required for this task (contact Dräger for details).
If the power pack type is changed from a replaceable battery type to a
rechargeable type, or vice versa, a Bodyguard
®
configuration update is
required using Dräger PC Link. Changing the power pack type applies
only to non-telemetry breathing apparatus.
Fig. 5
Rechargeable power pack versions
6.5.2 Removing the power pack
CAUTION
The screw in the telemetry version (Fig. 5, Item 1) is captive. Attempting
to remove the screw from the power pack casing might damage the
power pack.
►
Do not attempt to remove the screw from the power pack casing.
CAUTION
The screw in the non-telemetry version (Fig. 5, Item 2) is fitted with an
anti-tamper plug to prevent removal of the screw.
►
Do not attempt to remove the anti-tamper plug or loosen the screw.
A removal key (Dräger part number 3356667) is supplied with the
breathing apparatus.
1. Release the screw counterclockwise using a suitable coin on the
telemetry version (Fig. 5, Item 1) only.
2. Insert and press down the removal key (Fig. 6).
3. Remove the power pack.
Fig. 6
Removing the power pack
Symptom
Fault
Remedy
Leak test fail
Loose or dirty connector Disconnect, clean, and
reconnect couplings
Faulty hose or compo-
nents
Substitute user replace-
able parts and accesso-
ries
Low battery
Low power pack voltage Replace the batteries or
recharge the power pack
at the first opportunity
1)
1) When a low battery is first indicated, it is possible to safely use the breathing
apparatus for up to 2 hours.
Battery error
Incorrect power pack fit-
ted
Fit the correct power pack
type
Faulty power pack fitted Replace the power pack
Self-test fail with
fault code
Bodyguard
®
7000 fault Note the fault code (A, E,
F, P, or S) and contact
Dräger
Fails to switch on
Very low power pack
voltage
Replace the batteries or
recharge the power pack
(see section 6.5)
Poor power pack con-
nection
Inspect and clean the
power pack and pressure
module battery terminals
(see section 6.4). Contact
service personnel or
Dräger if there is any
damage
Low cylinder pressure
Fully charge the air cylin-
der
Fails to switch off
Pressure reading is not
below the preset value
Close the cylinder valve
and fully vent the pneu-
matic system
Tally fault
Replace the tally
Power pack latches
not moving to the
locked position
Dirty, damaged, or faulty
components
Attempt remedy actions in
the following order:
– Push down firmly on
the power pack
– Remove and clean the
power pack and back-
plate recess and retry
– Replace the power
pack and retry
D
U
Component/system Task
After
use
Every
month
Every 6
months
Complete system
Visual inspection
(see section 6.2)
O
O
Functional test (see
section 6.3)
O
O
Clean (see
section 6.4)
O
6.5 V rechargeable
battery power pack
Health check
1)
1) A Dräger 4-Way Charger is required for this task (contact Dräger for details).
O
1) The actual battery life of the power pack depends on the system operating time,
frequency of alarms, ambient temperature, and backlight use. A small amount
of battery power is consumed when the system is switched off.
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