Description And Operation; General; First Stage - Tusa RS-350 Manual Del Propietário

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Regulators
SECTION II

DESCRIPTION AND OPERATION

2.0 GENERAL

TUSA Regulators are BALANCED PISTON and BALANCED DIAPHRAGM type SIN-
GLE HOSE REGULATORS. The regulator reduces high pressure air from the scuba
cylinder to ambient pressure suitable for breathing, through the operation of first and
second stage regulators. The first stage regulator reduces incoming high pressure
air, to an intermediate pressure of approximately 135PSI ( 9.5bar). The second
stage regulator, using a diaphragm operated demand valve, further reduces air from
intermediate pressure to ambient pressure permitting normal breathing. The first and
second stages of the regulator are connected by a low pressure hose. A swivel yoke
(TYPE INT) on the first stage body secures the regulator to the cylinder valve, while
an O-ring surrounding the outlet orifice on the cylinder valve ensures an airtight con-
nection to the first stage.

2.1 FIRST STAGE

R-300 first stage
In order to achieve natural breathing, a dynamic flow hose with a large inner diam-
eter increases the airflow. The R-300 always supplies the diver with stable air at any
tank pressure or depth, delivering maximum breathing ease and comfort for them.
R-400 first Stage
The TUSA R-400 offers a first stage with the balanced diapraghm method. This
method features minimum variation in intermediate pressure in response to changes
in residual cylinder pressure and depth. The R-400 is engineerd for cold water diving
(EN-250-2000). It also offfers two high high flow LP ports (HFP) that are close to the
diapraghm to increas the airflow by aproximately 15%.
R-500 first stage
The very popular balanced piston type first stage offers superior reliability for stable
air supply regardless of depth or residual pressure.
R-600 and R-600 DRY first stage
With the R-600, offers a compact design weight of just 630g during actual use.
This allows the R-670 to only be a total weight of just 1050g for the first and sec-
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