Test Rig; Leak Tightness Of Mask And Exhalation Valves; Storage; Specific Maintenance Instructions And Replacement Of Spare Parts - Dpi Sekur SFERA Manual De Uso Y Mantenimento

8.1

Test rig

The test equipment consists of an inflatable dummy head, a mouthpiece connector, a test rig,
a plug to seal the exhalation valve and a plug to seal the threaded connector. The test
equipment, allows for a negative or positive pressure test. LABMATIC or LABTRONIC test
equipment can be supplied by D.P.I. s.r.l..
EN
8.2 Testing
Place the mask to be tested onto the inflatable head (wetting the surface with water) and
tighten the head harness. Inflate until the head becomes stable and in good contact around
the sealing edge of the mask. If necessary, adjust better the head harness. Place the sealing
plug on the inlet threaded connector of the mask. (close also the filter connector in the Sfera
SP/A ASB).Follow the test equipment instructions as shown in its instruction manual.
8.3

Leak tightness of mask and exhalation valves

The mask and exhalation valves pass the tightness test when, with the exhalation valve
previously damped, after a 10 mbar (1000 Pa) negative pressure is created inside the mask,
the pressure change is not more than 1 mbar (100 Pa) per minute. If the test is positive,
remove the mask from the dummy head and dry it if necessary. The mask can be used only
after passing the tightness test.
9

Storage

The masks must be stored in place at a temperature not higher than 50°C, protected from
cold and humidity, the rays of sun, intense heat, corrosive substances which can damage its
rubber, shocks, risk of falling down, dust and dirt. The rubber parts must not be submitted to
prolonged tensions and pressures to avoid distortion. The masks must be stored in their cases
or in special cupboards.
10

Specific maintenance instructions and replacement of spare parts

When the mask is disassembled in order to be cleaned and disinfected, it has to be
reassembled following the same procedure of spare parts replacement unless differently
indicated. Make sure that all component parts are correctly assembled, paying attention to
not damage all component parts during these operations.
10.1

Replacement of visor

Loosen the two screws on both sides of the frame paying attention not to lose the bolts.
Remove the frame and then the visor from the groove of its seal. Check that the heat
protective element of the frame is undamaged, if necessary, replace it. Unscrew the external
grid of the speech module with the disassembling tool provided and remove the inner mask
by disengaging it carefully from the exhalation valve assembly. Pay careful attention to the o-
ring gasket in the speech module housing. Remove the protective grid from the threaded
connector, use the disassembling tool to unscrew the exhalation valve assembly from the
outside of the mask (following the direction indicated by the arrow) and again paying careful
attention to the o-ring gasket. At this point the threaded input connector can be removed by
rotating it approximately 45°. Here again the o-ring gasket must be carefully kept. Before re-
assembling, make a visual check and, if necessary, replace the damaged or worn component
parts with original spare parts. Assemble the components in inverse order and pay careful
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