Sundstrom SR540EX Installation and user guide

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 1

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 2
…assemble the SR540ex head-top
BEFORE YOU START:
Check that the equipment is complete in
accordance with the packing list and has not
been damaged in transport.
Packing list:
•Face shield
•Breathing hose
•User instructions
•Cleaning tissue
Check that the O-ring of the hose is in place
Check that the flat gasket is ok and in place at
the other ok and in place at the other end.
Connect the end with flat gasket to the face
shield. Turn it clockwise about 1/8 of a turn.

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 3
Connect the hose to the face shield. Turn it
clockwise about 1/8 of a turn.
…control flow
Check that the fan unit is complete, correctly
mounted, thoroughly cleaned and undamaged.
Turn the flow meter bag inside out and the flow
meter will appear.
Place the head top in the flow meter and start
the fan unit.
Grip the lower part of the bag to seal around the
breathing hose.
Grip the flow meter tube with the other hand so
that the tube points vertically upwards from the
bag.
Read the position of the ball in the tube. This
should hover at a level with or slightly above the
upper marking on the tube.
If minimum flow is not achieved, check that:
•The flow meter is held upright.
•The ball moves freely.
•The bag seals well around the hose.

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 4
…fit the head-top
Raise the visor and put the face shield on. If
necessary, adjust the circumference of the head
harness by means of the knob at the rear of head
harness.
If necessary, adjust the head harness in height by
lengthening or shortening the strap for the top
of the head.
Lower the visor unit by pulling the face seal
down under your chin.
A clicking sound indicates that the visor unit has
been fully lowered.

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 5
Insert a finger between your chin and the face
seal and run the finger along the contact surface
of the face seal all the way round to check that it
fits well against the face.
Make sure that the breathing hose runs along
your back and is not twisted.
…change the visor
Remove the closing panels by pushing them
forward with your thumb.
Release the visor by moving the lever of over-
centre lock upwards through about 180 degrees
and remove the visor.

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 6
Remove the protective film from the new visor.
Secure the new visor first to the fixed mounting
and then to the over-centre mounting.
Tighten the visor by moving the lever
downwards as far as it will go.
Check that the visor is firmly in contact with the
visor opening seal all around.
Fit the closing panels by pushing them into place
with your fingers. A clicking sound indicates that
they are in place.

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 7
…change the face seal
Release the hooks from the head harness.
Release the face seal by pulling its frame so that
its pins are released from the visor unit holes.
Remove the face seal.
Thread the new face seal over the visor unit
flange, with the centre markings in line with one
another.
Press the face seal frame down so that the pins
drop into the visor unit holes. A clicking sound
indicates that they are in place.
Secure the hooks to the head harness in the
place where the sweatband is relieved.

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 8
…change the sweatband
Release the face seal hooks from the head
harness.
Pull the sweatband off.
Fit the Velcro strip with the ruffled side towards
the forehead strap and with the forehead strap
and with the forehead strap and with the relief
upwards.
Secure the hooks to the head harness where a
relief has been made in the sweatband.

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 9
…change the exhalation
membrane
Snap off the valve cover from the valve seat.
Pull off the membrane.
Check that the valve seat is OK.
Press the new membrane onto the pin. Carefully
check that the membrane is in contact with the
valve seat all the way around.
Press the valve cover into place. A clicking sound
indicates that it is in place.

SR540ex supplied-air face shield —How to Copyright © 2020 by The S.E.A. Group 10
…clean the SR540ex
Sundström cleaning tissues SR 5226 are
recommended for daily care. Clean face shield
and visor.
If necessary, spray the product with 70% ethanol
or isopropanol solution for disinfection.
If the equipment is more heavily fouled, use a
soft brush or sponge moistened with a solution
of water and dishwashing detergent or the like.
Rinse the equipment and leave it to dry.
Clean left and right closing panel.
Clean the exhalation membrane and the valve
seat and check that the seat is OK. Clean the
valve cover inside and outside.
Clean the face seal.