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DESCRIPTION OF THE FENZY X-PRO MONO/DUO (Figures 1a and 1b)
The FENZY X-PRO is a modular apparatus able to meet a wide variety of needs for respiratory protection.
The modular function of FENZY X-PRO depends on:
•
The type of compressed air cylinder (material, capacity, pressure)
•
The thread and shape of the cylinder valve used
•
The model of mask
Operating principle
Open-circuit self-contained respiratory protection apparatuses work with a compressed-air reserve under high pressure. This apparatus
allows users to be supplied with breathing air on demand from the cylinder(s) carried on the back.
The pressure of the compressed air in the cylinder(s) is first reduced to medium pressure by the first stage (pressure reducer). It then
enters the second stage (demand valve) to arrive in the respiratory mask after pressure has been reduced to a breathable pressure.
The demand valve maintains a slight overpressure in the mask, whatever the breathing rate, avoiding any ingress of outside air.
Backplate and straps
The backplate ensures comfort and stability when carrying the bottle. Its length can be adjusted quickly by the user to fit the different
body shapes of wearers.
Quick-tightening straps support the pressure gauge.
The backplate and its straps are rot-resistant and self-extinguishing.
Adjusting the height of the backplate (Figure 2)
To adjust the backplate, just grasp the two ends of the strap support firmly in your hands and press the yellow mark on the support with
both thumbs so as to rotate downward approximately 90°
:
•
Pull up to lengthen the backplate
.
•
Push down to shorten the backplate
.
To keep the new backplate adjustment, rotate the strap support upward approximately 90°
.
Pressure reducer (Figure 3)
•
The reducer keeps the medium pressure stable regardless of the residual pressure in the cylinder or cylinders and the respiratory
rate.
•
It is attached to the backplate and can be adapted to all valve types, depending on the thread of the handwheel.
•
The reducer operates at 200 or 300 bar.
•
A safety valve opens if the medium pressure exceeds the permitted limit in the event of an operating anomaly.
•
This pressure reducer is connected to:
- A medium pressure hose to the demand valve.
- A double hose, high pressure to the pressure gauge and medium pressure to the whistle.
•
The pressure reducer is set to generate a medium pressure of about 7 bar.
•
As an option, the second outlet from the pressure reducer can be fitted with a medium pressure connecting device with a
configuration depending on the type of facepiece and quick connector.
Pressure gauge and whistle (Figure 4)
A dial pressure gauge makes it possible to read the internal pressure of the cylinder or cylinders.
A powerful whistle, supplied by the medium pressure, warns the wearer when the high pressure falls to 55 bar, corresponding to residual
operating time of about 10 minutes at an average breathing rate.
The whistle is set automatically regardless of the pressure and sounds continuously till the cylinder(s) is shut or runs out of air.
As an option, the FENZY X-PRO can be fitted with a FENZY ANGEL 2 electronic monitoring device.
Demand valve
The FENZY X-PRO apparatus may be fitted with one of the following valves:
•
SA 5000 (Figure 5)
•
SA 5000 Zénith (Figure 5)
•
SX-PRO. (Figure 6)
The valves are equipped with an Air Klic and easily connected to the mask with the snap-on coupling.
The valves can only be snapped off deliberately with the hand by pressing the Air Klic buttons at the same time.
With SA 5000 or SA 5000 ZENITH type demand valves, a coupling sensor located in the valve automatically stops or starts positive
pressure in the mask when the demand valve is snapped off or on.
The FENZY X-PRO apparatus can optionally be equipped with a SX-PRO type diaphragm-operated valve, in which case pressure is
automatically regulated in the mask when the user takes his first breath.
However, if desired, the user can also regulate it manually by pressing the centre of the bypass button.
The lateral first inhalation button shuts off the SX-PRO valve's air supply after snap-off.
When using it in cold conditions, any moisture present in the demand valve can result in the formation of frost
inside the valve and consequently affect its operation.
It is essential to avoid all traces of moisture inside the demand valve and the medium pressure hose.
In particular the valve must be dried after cleaning it.
When the apparatus is worn, the bypass also provides an additional air supply in the respiratory mask. It is also used to flush the circuit
of the apparatus after use.
The valve is adjusted to supply static positive pressure of about 3 mbar.
