PAS®Micro Series
Airline/Short duration respiratory protection equipment with PAS®ASV Instructions for Use
3359994 (A3-D-P) Page 2 of 3
damage that may affect the operation of the breathing apparatus
include impact, abrasion, cutting, corrosion and discoloration.
Report damage to service personnel and do not use the apparatus
until faults are rectified.
3.1.2 Fitting the cylinder
1. Ensure that the cylinder is fully charged.
2. Place the carrying harness on a clean flat surface.
3. Fully extend the cylinder strap, shoulder straps and waist belt.
4. Check the threads of the cylinder valve port and the pressure
reducer. Ensure that the O-ring seal (Fig 4, Item 1) and the
sintered filter (Fig 4, Item 2) in the reducer are clean and
undamaged.
5. Referring to Fig 5, slide the cylinder through the cylinder strap
and align valve with the reducer. To prevent damage, ensure
that the cylinder remains clear of the hand wheel of the
pressure reducer while inserting the cylinder.
6. Align the cylinder with the centre of the carrying harness and
then screw the hand wheel of the pressure reducer on to the
cylinder valve (see direction arrow in Fig 5). Do not fully
tighten.
7. Referring to Fig 6, take up the slack in the cylinder strap (1) to
tighten around the cylinder and then pull the strap through the
buckle to secure (2). Insert the loose end of strap into the guide
loop (3).
8. Fully tighten the hand wheel hand tight. Do not use tools or
over tighten.
3.1.3 Functional testing
WARNING
If the breathing apparatus fails to meet any of the standards
or parameters described in the functional tests, or if an
immediate leak is evident, there is a system fault. Report
the fault to trained service personnel or contact Dräger. Do
not use the breathing apparatus until the fault condition is
rectified.
1. Positive-pressure systems: press the reset button
(Fig 3, Item 2) to switch off the valve.
2. Open the cylinder valve slowly, but fully, to pressurize the
system and ensure that cylinder is fully charged. The whistle
on the PAS®ASV sounds.
3. Fully close the cylinder valve.
4. Allow the air to vent from the PAS®ASV whistle and observe
the pressure gauge.
5. At approximately 70 bar, cover the whistle to stop the air flow
and then very slowly release the air. The whistle on the
PAS®Micro pressure reducer must commence in the range
110 to 100 bar.
6. Open the cylinder valve slowly, but fully, to pressurize the
system. The whistle on the PAS®ASV sounds.
7. To minimize cylinder air use: immediately connect the
independent air supply to the male coupling (Fig 1, Item 6),
and if the independent air supply has a shut-off valve, open the
valve. The whistle on the PAS®ASV stops.
8. Check for audible leaks. If there is any leak, investigate and
repair the leak before use (see Section 4). If necessary, use a
soapy solution to locate the leak.
WARNING
Do not direct the air flow on to the face, eyes or skin.
9. Press the front button (Fig 3, Item 3) to activate air flow from
the valve for 3–5 seconds. Unobstructed air will flow from the
outlet of the lung demand valve.
10. Positive-pressure systems: press the reset button
(Fig 3, Item 2) to switch off the valve.
11. Isolate and disconnect the independent air supply, and fully
close the cylinder valve.
12. Wait one minute and then observe the pressure gauge and
reopen the cylinder valve. The gauge must not show an
increase in pressure of more than 10 bar (one radial marking
on the gauge face). Investigate and repair any leak before use
(see Section 4). If necessary, use a soapy solution to locate
the leak.
13. Close the cylinder valve and vent the system as follows:
○Positive-pressure systems: cover and seal the lung
demand valve outlet with the palm of the hand. Press the
front button (Fig 3, Item 3) to activate air flow and then lift
the hand to very slowly vent.
○Negative-pressure systems: carefully press the front button
(Fig 3, Item 3) to very slowly vent.
14. The PAS®ASV whistle begins to sound at the preset switching
pressure, indicating that the valve has switched from the
independent air supply (AL) to the PAS®Micro air cylinder
(BA). The whistle on the pressure reducer will also sound as
the pressure falls. Both whistles will cease when the system is
vented.
15. Positive-pressure systems: press the reset button
(Fig 3, Item 2) to switch off the valve.
3.1.4 Putting on the PAS®Micro (ready position)
See also Fig 1 which shows the PAS®Micro worn in the ready
position.
1. Fully loosen the shoulder straps and waist belt and put on the
apparatus.
2. Check that the shoulder pads are not twisted and take the
weight of the system on the shoulders by pulling the shoulder
straps. Do not fully tighten at this stage.
3. Close the waist belt buckle and pull the ends of the waist belt
until it fits securely and comfortably.
!
!
4. Pull the shoulder straps until the breathing apparatus rests
securely and comfortably on the hips. Do not over tighten.
5. Check that the face mask port, and the lung demand valve
coupling and O-ring are clean and undamaged.
6. Connect the lung demand valve to the face mask as follows:
○Push-in coupling: press into the port of the face mask until
it latches in position. Check the attachment by gently
attempting to pull the coupling apart.
○Screw-in coupling: screw into the port of the face mask and
tighten hand tight. When the lung demand valve is fitted to
the face mask, the connector can swivel to allow for head
and body movement of the wearer.
7. Put the neck strap of the face mask over the head, and then
insert the neck strap stud into the hole in the centre strap of the
head harness.
3.1.5 Putting on the face mask
WARNING
Correct fit of the face mask can only be achieved if the
complete mask seal makes contact with skin. Head hair,
facial hair (including beard stubble and sideburns),
earrings, other facial piercings and normal spectacles will
interfere with the mask seal and are not permitted in the
sealing area. Additionally, head hair that could affect the
face mask fit (buns, pony-tails, hairpieces, etc.) is not
permitted.
NOTICE
Refer also to the face mask Instructions for Use.
1. Positive-pressure systems: press the reset button
(Fig 3, Item 2) to switch off the valve.
2. Open the cylinder valve slowly, but fully, to pressurize the
system. The PAS®ASV whistle is supplied from the air cylinder
and therefore sounds immediately.
3. Detach the neck strap stud from the centre strap of the head
harness.
4. Spread the head harness (Fig 7). Place the chin into the chin
cup of the face mask and pull the harness over the head
locating the harness centre plate on back of the head.
5. Referring to Fig 8, tighten both lower (1) and then upper straps
(2) evenly towards the back of the head. If necessary, tighten
the centre strap (3).
6. Breathe normally and carry out the mask function check.
3.1.6 Mask function check
1. Close the cylinder valve and breathe normally to empty the
system of air. When empty, the face mask should hold on to
the face to indicate a positive seal. If a leak is detected,
readjust the head harness and retest.
2. Immediately reopen the cylinder valve and recommence
breathing – exhaled air should flow easily out of the exhalation
valve.
When the function check has been satisfactorily completed,
breathe normally and proceed to the work area.
3.2 During use
The nominal duration (10 or 15 minutes) applies to a PAS®Micro
with a fully charged cylinder, and refers to the usage time until the
whistle on the pressure reducer sounds to warn the wearer that
there is low cylinder pressure. The wearer should be in a safe area
before the whistle on the pressure reducer sounds.
3.2.1 Self-contained use (not supplied by an airline)
WARNING
The available duration starts from the time that the cylinder
valve is opened, and is dependent on the capacity of the
cylinder and the breathing rate of the wearer.
Dräger strongly advise that the front button (Fig 3, Item 3)
is not pressed to deliver supplementary air into the mask
during self-contained use. Using supplementary air would
use air from the cylinder and reduce the operating duration
of the air supply.
●Regularly check the reading on the cylinder pressure gauge.
●If the whistle on the pressure reducer sounds, there is low
cylinder pressure. Immediately leave the hazardous area by
the shortest and safest route.
●The PAS®ASV whistle sounds continuously.
3.2.2 Airline use
WARNING
Dräger recommend that the user carries out a risk
assessment to establish local procedures to be followed in
the event of failure of the independent air supply.
If the PAS®ASV whistle sounds at any time during an
operation, the PAS®ASV has switched to supply the
wearer from the PAS®Micro air cylinder. If you continue to
work while breathing from the air cylinder, regularly check
the cylinder pressure gauge – ensure that the remaining air
in the air cylinder allows sufficient time to evacuate to a
safe area.
During airline use, at very high work rates the pressure in
the face mask may become negative at peak inhalation
flow.
NOTICE
The PAS®Micro cylinder valve must remain open during
airline use.
●Connect the independent air supply to the male coupling
(Fig 1, Item 6), and if the independent air supply has a shut-off
valve, open the valve. The whistle on the PAS®ASV stops –
this indicates that the wearer is now breathing from the airline.
●If additional air is required, briefly press and release the front
button (Fig 3, Item 3) to deliver a single jet of supplementary air
into the mask.
●When the task is complete or when advised by a controller
leave the hazardous area:
○Disconnect from the independent air supply (see
Section 3.2.1), or
○Remain connected and carefully withdraw the airline hose.
Evacuation procedure (independent air supply failure)
If the independent air supply fails, the wearer should proceed in
line with established local procedures (see warnings above).
●To evacuate proceed as follows:
a. Disconnect the independent air supply from the
PAS®Micro.
b. Immediately leave the hazardous area by the shortest and
safest route. The PAS®ASV whistle is supplied from the air
cylinder and therefore sounds continuously during the
evacuation.
When in a safe area, remove the lung demand valve from the face
mask if necessary and continue to breathe normally.
3.3 After use
WARNING
Do not remove the equipment until in safe area, clear of
hazard.
CAUTION
Do not drop or throw down equipment as damage could
occur.
1. Loosen the face mask straps.
○Positive-pressure systems: as the seal between the mask
and the face is broken, press the reset button (Fig 3,
Item 2) to switch off the valve.
2. Remove the face mask and fully extend all of the straps of the
head harness.
3. If the independent air supply is still connected, isolate and
disconnect the supply.
4. Fully close the cylinder valve.
5. Press the front button (Fig 3, Item 3) to fully vent the system.
6. Remove the lung demand valve from the face mask (Fig 9 –
push-in coupling shown).
7. Open the waist belt buckle, lift the shoulder strap buckles to
loosen the harness, and then remove the equipment.
8. Carry out the after use maintenance tasks in the maintenance
table (see Section 5.1).
4 Troubleshooting
The troubleshooting guide shows fault diagnosis and repair
information applicable to breathing apparatus users. Further
troubleshooting and repair information is available in Instructions
for Use supplied with associated equipment (e.g. face mask and
air cylinder).
Contact service personnel or Dräger when the remedy information
indicates a service task, or if the symptom remains after all remedy
actions have been attempted.
5 Maintenance
5.1 Maintenance table
Service and test the breathing apparatus, including out-of-use
apparatus, in accordance with the maintenance table. Record all
service details and testing. Refer also to the Instructions for Use
for the lung demand valve, face mask and other associated
equipment.
Symptom Fault Remedy
High-pressure air
leak or failed leak test
Loose or dirty cylinder
connector
Disconnect, clean and
reconnect the connector
and retest
Faulty hose or
component
Substitute user
replaceable accessories
and retest
Air leak from
medium-pressure
hose connection at
the pressure reducer
(safety relief valve)
Faulty O-ring, retainer,
spring or pressure
reducer
Service task
High or low medium
pressure
Pressure reducer fault Service task
Poor sounding
whistle
Whistle dirty Clean whistle flute and
retest
Whistle not
functioning correctly
Activation mechanism
fault
Service task
