11
FIRST BREATH MASK
Positive pressure is automatically activated by the rst breath and can be switched off
manually by pushing the lifting arm on the breathing valve away from the diaphragm
cover.
Activated positive pressure Positive pressure switched off
1.4 BREATHING VALVE AND BY-PASS VALVE
The SPIROMATIC S breathing valve has a “plug-in” connection to connect it to the
face mask. The outer speech cone locks the breathing valve into position. This feature
provides a safe positive connection between the face mask and breathing valve and
prevents accidental disconnection.
The by-pass valve overrides the normal automatic function of the pressure demand
valve. When the by-pass valve is opened the air will free ow into the mask. To open
the valve turn the red knob counter clockwise. To close the valve turn the red knob
fully clockwise.
NOTE! WHEN THE BY-PASS VALVE IS OPEN THE DURATION TIME WILL BE SHORTER. WHEN THE BY-PASS VALVE IS
OPERATED THE WEARER SHOULD ABORT ANY OPERATION AND RETURN TO AN AREA OF RESPIRABLE AIR.
1.5 REGULATOR ASSEMBLY WITH RIC UAC
The pressure regulator used in the S9 and S9 Incurve models is a balanced piston
pressure reducer with an extremely high ow capacity. The very high capacity ensures
that the positive pressure is maintained in the mask even at low cylinder pressures and
at extremely high breathing rates.
The regulator unit is of a “plug in” type which means that it is pushed into a manifold
and locked in place with a locking clip and cover. This modular system enables
simple servicing to be carried out with minimum down time for the apparatus by using
service exchange of modular components.
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