Dräger Panorama Nova P Notice D'utilisation page 19

4.3.3 Visual inspection of the exhalation valve
1. Remove the exhalation valve cover
from the connector.
2. Press in one side and remove the
spring carrier.
3. Pull the valve disc out of the guide.
4. The valve disc and valve seat must be
clean and undamaged. Otherwise
clean and replace.
5. Moisten the valve disc with water and insert it. The valve disc must
slide into the guide of its own accord.
6. Set the spring carrier in a way that both sides snap into place on
the sides. It is marked with "L" = left and "R" = right and sits at an
angle.
4.3.4 Leak tests
Perform the leak test with a suitable test unit (e.g. from the Testor or
Quaestor series).
(1) Checking leak tightness
1. Moisten the inside of the face seal with water and mount the full
face mask to the test head.
2. If necessary, inflate the test head until the face seal fits
everywhere.
3. Seal the connector with the adapter.
4. Moisten the exhalation valve if necessary.
5. Generate a negative pressure of 10 mbar.
The full face mask is considered leak-tight if the change in pressure
after 1 minute does not exceed 1 mbar. Otherwise continue with (2).
Panorama Nova P
(2) Checking leak-tightness by sealing the exhalation valve
1. Remove the exhalation valve disc.
2. Insert the exhalation valve plug and fasten it with the spring carrier.
L R
3. Generate a negative pressure of 10 mbar.
4. Remove the exhalation valve plug if the pressure difference is less
than 1 mbar after 1 minute, insert a new valve disc and repeat the
leak test. Otherwise, continue with (3).
(3) Leak test under water
1. Completely immerse the test head with the applied full face mask
in water.
2. Create an overpressure of approx. 10 mbar and slowly turn the
immersed test head.
Emerging air bubbles indicate the leak.
3. Take the test head with the facepiece out of the water, repair the
facepiece, replace leaking components.
4. Remove the exhalation valve plug and insert the exhalation valve.
5. Repeat the leak test (1).
Checking the opening pressure of the exhalation valve
When using the Quaestor test unit, the initial pressure should be at
least 4.2 mbar at a constant flow rate of 10 litres per minute through
the full face mask. Otherwise, replace the spring and repeat the test.
When using a test unit that does not allow for this constant flow rate
(e.g. Testor), the initial pressure must be at least 4.5 mbar.
After testing
1. Press the button and disconnect the adapter.
2. Remove the full face mask from the test head and dry it if
necessary.
3. Fit the exhalation valve cover. Ensure that it locks into place.
(approved by Dekra Exam) 19