Spasciani RC Manual Del Usuario página 15

To use cylinders different than those indicated, be sure that they comply with the relevant requirements in
the country of application and that they are filled with breathable air according to EN12021 and compatible
with the fixing system on the trolley (if present).
Never use cylinders at a Pressure higher than the working pressure of the apparatus (300 bars).
3.3.3 Pressure reducer (3) RB
The reducer assembly is made of a nickel plated light alloy aluminium body in which there are the devices
that deliver a constant pressure of 5.5 Bar irrespective of cylinder pressure until the alarm set point is
reached.
As the cylinder/s pressure drops to the alarm set point (55 +/- 5 bars for the reducer mounted on the little
trolley and 35 +/- 5 for the others) a special device increases the outlet pressure to 8.0 bar and so actuates
the audible warning in the demand valve. The alarm is repeated by the audible alarm fitted to the reducer.
The pressure reducer is directly connected to one or two high pressure hoses for the connection to the
cylinder(s). The cylinders attachment on the reducer is provided with non return valves.
The tube(s) are provided with UNI4410 or EN144 standard screw connector for the cylinder (s) connection
and with a valve that enables to vent the air off when the replacement on an empty cylinder is needed.
The reducer is mounted on a metal body that also comprises the part described in the paragraphs below and
it can be placed on a trolley, fixed to a high pressure line or on a cylinders pack .
RB complete group is made of the following parts:
•
Acoustic warning at the trolley (21) It emits an intermittent signal when the air reserve drops
below
the alarm set point (55 +/- 5 bars for the reducer mounted on the little trolley and 35 +/- 5 for the others)
and it works at the same time of the warning at the mask.
•
High pressure gauge (22)
•
Medium pressure gauge (23)
•
First medium pressure outlet. Normally in a trolley system this outlet is connected to a medium
pressure tube (24) feeding the 8x17 breathing tube (6) placed on the reel. If the RB is not used
on a trolley system this first outlet may be provided with a female quick coupling (25) for the
direct connection of the breathing tube.
•
Female quick coupling (25) to connect the second operator breathing tube
3.3.4 Medium Pressure tube (6)
With quick safety and slip-off proof connectors (11) in the following lenghts 10, 20, 30, 50 m.
3.3.5 Supporting waist belt (8)
Adjustable belt supporting the feeding hose hung to the special safety hook (7).
3.3.6 Demand valve with audible warning device (4)
A Fiberglas reinforced plastic housing holds both the device that delivers the air and the audible warning.
The button (17) locks the device which is then unlocked by the first breath-in.
After the first inhalation which releases the device (17), the Demand Valve injects the necessary quantity of
air into the mask and keeps a positive pressure no matter what the demand.
As the pressure drops below the alarm set point (55 +/- 5 bars for the reducer mounted on the little trolley
and 35 +/- 5 for the others) the medium pressure suddenly increases to 8 bar thus actuating the Audible
Warning at the mask. With every inhalation it is then produced a sounding vibration which will continue till
the air reserve is completely used up. The position of the warning device at the mask, being close to the
operator's ears, makes it possible to hear the whistle even in the noisiest environment.
The Audible Warning, moreover, does not waste any air since the sound is made by the air being breathed.
The demand valve can be of type A or BN according to the connector provided.
3.3.7 Full face mask (5)
The mask can be of the following types:
• Type TR 82 A, to EN 136:98 Cl. 3, provided with threaded connector to EN 148-3.
• Type TR 2002 A or TR 2002 S A, to EN 136:98 Cl. 3, provided with threaded connector to EN 148-3.
15