6
⚠
WARNING
Diving in cold water requires special equipment and techniques. Before diving in
cold water we strongly recommend you obtain adequate training from a recognized
training agency.
7. The content of this manual is based upon the latest information available at the time of
going to print. SCUBAPRO reserves the right to make changes at any time.
SCUBAPRO refuses all responsibility for damages caused by non-compliance with the
instructions contained in this manual. These instructions do not extend the warranty or the
responsibilities stated by SCUBAPRO terms of sales and delivery.
4. REGULATOR SYSTEM
A regulator system is required to reduce the pressure of the compressed air contained in
the cylinder to an ambient pressure in order to supply breathable air when needed. It is also
possible to connect pressure gauges (analog or digital), IP inators to supply buoyancy
compensators, dry suits and other devices to this system. The regulator system is composed
of a pressure reduction device and one or more breathing devices. In this manual, the
pressure-reducing device and the breathing device will be indicated, respectively, by the
terms “rst stage” and “second stage.”
4.1 First stage
A pressure-reducing mechanism that reduces the pressure of the compressed air contained
in the cylinder to an intermediate relative pressure of about 9.5 bars (138 psi). The rst stage
uses a standard piston, balanced piston or diaphragm mechanism.
4.2 Secondstage
This unit is supplied, with the intermediate pressure coming out of the rst stage through the
low pressure hose. It reduces pressure further to balance air with the ambient pressure. The
second stage may be balanced or unbalanced and equipped with a Venturi effect control
(V.I.V.A.) and/or with an inhalation resistance control.
An example of a complete regulator and with either a DIN or INT connection rst stage,
depending on the tank valve:
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