Oceanic Regulator Equipment - Manual (Page 13)

13
Owner's Guide
Delta 3 Adjustment Knob (on side):
The Delta 3 provides a breathing effort adjustment (knob on the side of the
body) that enables you to adapt breathing performance to different diving condi-
tions.
 By turning the adjustment knob 'clockwise' breathing resistance (effort) is in-
creased. 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 snorkeling.
 Turning the adjustment knob 'counter clockwise' decreases breathing resis-
tance and reduces work of breathing. Adjustment should be used to im-
prove performance, it should not be used as a method to use less breathing
gas. During periods of heavy exertion underwater, and to compensate for
the effects of depth, it is advantageous to have a regulator that can provide
minimal inhalation resistance and optimal performance when desired.
Guidelines for Delta 3adjustments (knob on side):
NOTE: Rotation of the Delta 3 adjustment knob does not rotate
the poppet seat against the sealing orifice.
Normal Pre Dive Setting -
 To set the Delta 3 to an average breathing resistance, 1 to 1 1 /
2
column
inches of water (common factory setting), attach the first stage to an appro-
priate cylinder and open the valve to pressurize the regulator.
 Rotate the adjustment knob 'counter clockwise' until leakage is heard, then
rotate the knob clockwise 1 /
2
to 1 turn.
High Flow Setting -
 When diving deep, facing a long swim up current, or during other periods
of heavy exertion, it is desirable to make the Delta breathe as easy as pos-
sible. This setting should be used only when necessary to avoid loss of
breathing gas that may occur due to the Delta's extra sensitivity at this set-
ting.
 To adjust the Delta for minimum breathing resistance, rotate the adjustment
knob 'counter clockwise' until a slight flow of breathing gas begins, then ro-
tate the knob 'clockwise' until the flow stops.
 Frequently monitor your breathing gas supply when the Delta is adjusted for
maximum flow.
Preventing Air Loss -
 To prevent free-flow when the Delta is out of your mouth, or when con-
nected as an octopus second stage, rotate the adjustment knob 'clockwise'
several turns. At the surface, place the Delta 3's Pre-Dive / Dive switch in
the left (-) position (Pre-Dive) to reduce, or eliminate, free-flow.