OMS Airstream Evoque Regulator, Owner'S Manual

Page: 14 / 33

14
SENSITIVITY ADJUSTING KNOB
This inhalation adjusting knob allows you to adjust the sensitivity of the regulator.
This is done to prevent undesirable loss of breathing gas (free flowing) that often occurs
when a high-performance regulator second stage is connected as an octopus second
stage, or when the primary second stage is not in the diver’s mouth, such as when surface
swimming.
When you screw the knob in, the force holding the valve against the seat is increased,
which reduces the regulator’s sensitivity; the inhalation effort required to open the valve is
then increased.
This sensitivity adjustment allows you to compensate for the difference in hydrostatic
pressure between your pulmonary center and your demand valve.
Turning the adjustment knob ‘counterclockwise’ decreases breathing resistance and
reduces work of breathing.
Turning the adjustment knob ‘clockwise’ increases breathing resistance and increase work
of breathing. When you hear a ‘click’ it means that it’s reached its maximum resistance.
Please don’t turn anymore.
Adjustment should be used to improve performance, not be used as a method to use less
breathing gas.
During heavy exercise underwater, and to compensate for the effects of depth, it is
advantageous to have a regulator that will provide minimal inhalation resistance and
optimal performance when desired.