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. Follow the test equipment instructions
as shown in its instruction manual.
8.3
Mask and exhalation valve leak tightness
The mask and exhalation valve meet the tightness requirements when, with the exhalation valve previously damped, after
a 10 mbar (1000 PA) negative pressure is created in 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 rubber 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 degrees, protected from cold and humidity, the
rays of sun, intense heat, corrosive substances which can damage the 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 should 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 degrees. Here again the o-ring gasket must be carefully kept. Before reassembling, 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 attention to the three o-ring gaskets. In order to reassemble easily the visor,
moisten the rubber seal of the visor and the frame with water. For a correct positioning make reference to the two small
circles visible on the upper part of the visor. While reassembling the frame keep in mind that the screws have to placed
from the upper part of the frame. Check that all parts, particularly the gaskets, are correctly assembled. Make sure that
the inner mask is correctly positioned on the exhalation valve and of to the tightening the sealing elements.
10.2 Replacement of threaded connector
Disconnect the inner mask from the seat of the exhalation valve assembly. 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), paying attention to the gasket. At this point the threaded input connector can be
removed by rotating it approximately 45 degrees. Before assembling, make a visual check of the component parts,
particularly checking the gasket. Replace the damaged or worn component parts with original spare parts. Clean the
component parts if necessary. Reassemble the components in inverse order. Make sure that the gasket and the inner
mask are correctly assembled on the exhalation valve assembly and tightened.
10.3 Replacement of speech module
Use a compass spanner, easily commercially available, to unscrew the locking ring (inside the mask) of the speech
module and pull the speech diaphragm and its gasket out of the seat. Check that the components are not dirty and, if
necessary, clean them. Assemble the spare parts in the following order: Gasket - Speech module (with the date towards
the inside of the mask). Tighten the locking ring of the speech diaphragm appropriately.
10.4 Replacement of exhalation valve assembly
Remove the protective grid from the threaded connector, thus having access from outside to the exhalation valve
assembly. Disconnect the inner mask from the seat of the exhalation valve assembly. Use the disassembling tool to
unscrew the exhalation valve assembly from the outside of the mask (following the direction indicated by arrow) paying
attention to the gasket. Check the seal of the exhalation valve assembly seat and the inner mask seal. Make sure that the
gasket and the face seals are not dirty and, if necessary, clean them. Put the grid back.
10.4.1 Replacement of exhalation valve for SFERA and SFERA/Silicone only
Remove the protective grid from the threaded connector, thus having access from outside to the exhalation valve
assembly. Pull the rubber valve out of its seat with your thumb and index fingers. Make sure that the valve housing and
seat are not dirty or damaged and, if necessary, clean or replace them. Insert the valve-stem in the central hole of the
seat and pull it strongly from the inside of the facepiece until a click is heard. Put the grid back.
