Dräger Panorama Nova S Mode D'emploi page 15

Visually inspect the exhalation valve
Pull off the exhalation valve cover from
the connector.
Pull one arm outwards and remove the
spring clamp.
Hold the valve disc by the nipple and
lift out of guide.
The valve disc and seat must be clean and undamaged. Clean or
replace if necessary.
Moisten the valve disc with water and refit. When the seat is
horizontal, the valve disc must slide into the guide under its own
weight.
Fit the spring clamp and spring so that both arms engage laterally.
The spring clamp is marked "L"= left and "R" = right and fits at an
angle.
Leak tests
Test equipment and test accessories: Test-It 4100 (AG 02 400),
Testor 2100 (R 53 400), Prestor (AG 02 000), Quaestor, adapter
(R 53 345), dummy plug (T 52 246), exhalation valve plug (R 53 346)
and mask support S (R 53 930).
(1) Checking for leak tightness
Moisten the inside of the face seal with water and fit the breathing
connection with mask support S to the test head (see "Fitting the
mask / helmet combination and checking its operability" on
page 12).
Inflate the test head until the face seal fits snugly all round.
Grease the O-ring on the dummy plug or adapters.
Seal the connector with the adapter.
Moisten the exhalation valve if necessary.
Generate a negative pressure of 10 mbar.
The breathing connection is considered leak-proof if the pressure
change after 1 minute is no more than 1 mbar. If not, perform (2).
(2) Test with sealed exhalation valve
Remove the exhalation valve.
Insert the exhalation valve plug and secure with the spring clamp.
L R
Generate a negative pressure of 10 mbar.
If the pressure change is less than 1 mbar after 1 minute, remove
exhalation valve plug, insert a new valve disc and repeat the leak
test. If not, perform (3).
(3) Underwater leak test
Immerse the test head together with the breathing connection in
the water.
Generate a positive pressure of approx. 10 mbar and rotate the
test head slowly under the water.
Escaping air bubbles indicate the source of any leak(s).
Remove the test head and breathing connection from the water.
Seal any leaks found.
Remove the exhalation valve plug and fit the exhalation valve.
Repeat the leak test.
Checking the opening pressure of the exhalation valve
If using the Quaestor tester, the opening pressure must be at least
4.2 mbar with a constant flow of 10 litres/minute through the breathing
connection. If not, replace the spring and repeat the 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
Press the button and disconnect the adapters.
Remove the breathing connection from the test head and dry it if
necessary.
Fit the exhalation valve cover. Ensure that it engages.
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