Aqua Lung Apeks Regulator - Manual (Page 14)

US
14
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” (anti-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 31.
Regulator Owner’s Manual
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Resistance