Leak Tests; Special Maintenance And Care; Replacing The Visor - Dräger Panorama Nova P Instrucciones De Uso

4.3.4

Leak tests

Perform the leak test with suitable test equipment, e.g. from the Testor
or Quaestor series (see chapter 8 on page 21).
(1) Checking for leak tightness
1. Moisten the inside of the face seal with water and fit the mask to
the test head.
2. If necessary, inflate test head until the face seal fits snugly all
round.
3. Seal the equipment connector with the adapter.
4. If necessary, moisten the exhalation valve.
5. Generate a negative pressure of 10 mbar.
The mask is considered leak-tight if the pressure change after
1 minute is no more than 1 mbar. If not, perform (2).
(2) Test with sealed exhalation valve
1. Remove exhalation valve disc.
2. Insert exhalation valve plug and secure with spring holder.
3. Generate a negative pressure of 10 mbar.
4. If the pressure change is less than 1 mbar after 1 minute: remove
exhalation valve plug, insert new valve disc, and repeat the leak
test. If not, perform (3).
(3) Leak test under water
1. Immerse the test head together with the full-face mask in water.
2. Generate a positive pressure of approx. 10 mbar and rotate the
test head slowly underwater.
Escaping air bubbles indicate the source of any leak(s).
3. Take the test head with the facepiece out of the water, repair the
facepiece, or replace leaking components.
4. Remove the exhalation valve plug and fit the exhalation valve.
5. Repeat the leak test (1).
Panorama Nova P
Checking the opening pressure of the exhalation valve
If using the Quaestor test unit, the opening pressure must be at least
4.2 mbar with a constant flow of 10 litres/minute through the mask. If
not, replace spring and repeat test. If using test equipment that does
not permit this constant flow rate (e.g. Testor), the minimum opening
pressure must be 4.5 mbar.
After testing
1. Press button and remove adapter.
2. Remove the mask from the test head and dry it if necessary.
3. Fit the exhalation valve cover. Ensure that it engages.
4.4

Special maintenance and care

NOTICE
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Required tools are listed in chapter 8 on page 21.
4.4.1

Replacing the visor

1. Full-face masks with metal visor frame:
Unscrew screws, hold tight hexagon nuts.
1. Full-face masks with plastic visor frame:
Unscrew screws.
2. Pry the visor frame apart at the joints with a screwdriver, and then
pull the top and bottom halves apart.
3. Remove the support plate if necessary (see chapter 4.4.2 on
page 20).
4. Detach the old visor from the rubber frame.
5. Insert the new visor first in the upper and then in the lower half of
the rubber frame.
The midposition markers on the visor must line up with the seam
on the mask body.
6. Pull the rubber frame to the right and left over the rim of the visor.
(approved by Dekra Exam) 19