Sundstrom SR 520, Instructions For Use Manual, Page: 80 / 89

Drawn up by: 2009-01-21 /RK
HI-SR 520 EN
Revision: 02
Review: 2014-01-13/PA
Page:
4 of 13
Connect the hose to the fan unit and
turn it clockwise about 1/ 8 of a turn.
Flow control
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.