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 divers 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.
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