12
Inhalation Resistance Control Knob
Some second stage models are equipped with an additional
adjustment, which controls inhalation resistance.
This control knob, located beside the
IVS/RVS switch, adjusts the amount of
effort required to start the air flow at
the beginning of the
inhalation cycle. As it is
turned “in” (clockwise),
the opening effort will
increase. This will make
the second stage less
sensitive to sudden
changes in ambient
pressure. Turning the knob
“out” (counter-clockwise) will
decrease the opening effort to
make breathing easier.
This adjustment is particularly useful at deeper depths, or in variable
conditions that affect the opening effort of the second stage, such as
strong currents or while using a diver propulsion vehicle (DPV). You
can use the inhalation control knob to tune your regulator to maintain
its peak performance throughout the course of your dive, or you can
leave it set in its mid-range position and dive with it as you would any
non-adjustable second stage.
For more information on using these adjustments, refer to the section
titled, Diving With Your Regulator, on page 20.
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