Operating Principle - Spasciani RC Manual Del Usuario

 The compressed breathable air used for feeding the RC and RL respirators shall always comply with the requirements
of the EN 12021 standard.
The air must have a maximum dew point, as indicated in tables 2 and 3 of EN 12021, to prevent the condensation
of water freezes inside the apparatus when used at low temperatures.
Do not use oxygen or oxygen‐enriched air.
 Beard and bushy sideburns may affect the fit of the face mask.
 In case of very heavy work, during inspiration could arise in the mask a depression which involves the risk pollutants
penetration.
 Perform a risk analysis to avoid connecting to a source that is not EN 12021 breathable air but for example a mixture
of oxygen enriched air (e.g. Nitrox).
 The apparatus should not be used outside the temperature range specified in EN 14593‐1: ‐30°C and + 60°C.
 The airline may not provide adequate protection in highly toxic atmospheres if the concentration of pollutant
exceeds 1000 times the value of the TLV.
 Before starting work, the operator must always ensure that the cylinder(s) is charged and that the demand valve
supplies air regularly.
 Before accessing a confined space and / or an highly polluted environment, it must be carried out a preliminary
check of the environment (explosiveness, oxygen deficiency, toxicity) in order to highlight all the risk factors and
allow the choice of suitable DPI; the apparatus can still be used in potentially explosive atmospheres as the materials
with which it is manufactured are known not to produce sparks even if bumped.
 If the apparatus is used in combination with a back up system BVF‐BU (31) carefully check that it is set to give an
alarm (32) when in use (read carefully the instructions that come with the BVF‐BU).
 The use of non original spares or parts voids CE approval and manufacturer's warranty.
4. DIMENSIONS WEIGHT DURATION
The following table gives only an example of the cylinders available at Spasciani and the relative autonomy / duration
of the RC airline equipped with one or more bottles of these types:
Capacity
l
1x50
2x50
2x6
4x6
@
2x6.8
@
4x6.8
@
2x9
@
4x9
@ = cylinder in composite material, according to EN 12245 standard.
(1) At an average flow of 30 l/min with only one operator
* At 300 bar the formula PxV to calculate the volume of available air is not valid any more as the compressibility factor that
reduces the volume of some 8%.
Different cylinders and cylinders packs can be used provided that:
‐ they comply with the relevant requirements in the Country of application (in Europe PED or TPED regulations);
‐ the filling pressure does not exceed the maximum operating pressure of the device;
‐ they are filled with breathable air according to EN 12021;
‐ the dimensions are compatible with the slots and the fastening devices.
5. OPERATING PRINCIPLE
5.1 RC system
Compressed air from cylinder (s) (2) is reduced in pressure by the pressure reducer RB (3) at 5.5 bar and led to the
demand valve (4) connected to the face mask (5). 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
soon the pressure decreases below the alarm set point (55±5 bar for the reducer mounted on the little trolley and 35±5
bar 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 warning is repeated by a special device positioned on the RB reducer block that sounds to catch the assistant's
attention. This device stops sounding only at the complete exhaustion of the air.
5.2 RL system
The RL air line shall be fed at 5.5 bar. If the air is delivered from a compressor, the audible warning at the mask cannot
operate. When air comes from a compressor, make sure that air is duly filtered and free from particles or droplets (as
described in EN 12021 standard). To set up a system fitted with audible warning it is necessary to have a high pressure
cylinder pack and feed the line by means of a pressure reducer type RB (3) with warning device (21). The operation is
then the same as that described for the RC respirator under par. 5.1.
Pressure Reserve
bar l
300 13800*
300 27600*
300 3320*
300 6640*
300 3750*
300 7500*
300 4970*
300 9940*
Duration
(1)
460 min (7.5 h)
920 min (15 h)
110 min (1.8 h)
220 min (3.6 h)
125 min (2 h)
250 min (4 h)
165 min (2.8 h)
330 min (5.5 h)
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Alarm set point
bar
35  5
35  5
55  5
55  5
55  5
55  5
55  5
55  5