Dräger X-plore 6000 Gebrauchsanweisung Seite 82

Maintenance
4.3.5 Replacing the speech diaphragm and O-ring
1. Pull the nose cup out of the groove in the screw ring.
2. Unscrew the screw ring with a spanner.
3. Turn the spanner over and carefully insert it in the holes of the
grille, taking care not to damage the foil on the diaphragm.
4. Turn the speech diaphragm to release it and remove it (figure H).
5. Remove the O-ring from the connector with the sealing ring lifter.
6. Check speech diaphragm and O-ring and replace if necessary.
7. Press the edge of the nose cup into the groove in the screw ring
and ensure that it engages all around. The edge of the nose cup
must fit all around the full circumference of the screw ring. The
center marks on the facepiece connector and on the nose cup
must match.
4.3.6 Replacing the exhalation valve disc
1. Remove the exhalation valve cover.
2. Grip under the edge of the valve disc and pull the holding stud out
of the hole.
3. Clean the valve seat.
4. Moisten the new valve disc with water and press it into the hole
until it engages. The valve disc must make even contact all
around.
5. Refit the exhalation valve cover so that it clicks into place.
4.3.7 Replacing the inhalation valve disc
1. Pull the inhalation valve out by its tab.
2. Remove the old valve disc and fit new disc.
3. Press the inhalation valve into the mask connector until it makes
even contact all-round. The valve disc must not be pinched. The
disc must face inwards, and the stems face outwards.
82
4.4
The leak test should be performed with an appropriate test device
(e. g. the Testor or Quaestor series) with test adapter and exhalation
valve plug or Test Kit.
(1) Checking leak tightness
1. Moisten the face seal and exhalation valve with water.
2. Mount the facepiece on the test head.
3. Make sure that the face seal fits tightly onto all parts of the test
4. Seal the connector with the test adapter and produce a negative
The facepiece is considered leak-tight if the pressure drop is less than
1 cm H
(2).
(2) Test with sealed exhalation valve
1. Remove the exhalation valve disc.
2. Plug in the exhalation valve plug.
3. Generate a negative pressure of 10 cm H
4. If the pressure drop is less than 1 cm H
5. Repeat the leak test (1). If the facepiece leaks, continue with (3).
(3) Leak test under water
1. Immerse the test head including the facepiece with exhalation
2. Produce a positive pressure of approx. 10 cm H
3. Slowly turn the test head under the water surface. Emerging
4. Take the test head with the facepiece out of the water, repair the
5. Remove the exhalation valve plug.
6. Install the exhalation valve.
7. Repeat leak test (1).
(Use Instructions for NIOSH-approved full facepieces)
Leak tests
head. Inflate the test head if necessary.
pressure of 10 cm H O (10 mbar).
2
O (1 mbar) per minute. If the facepiece leaks, continue with
2
remove the exhalation valve plug and insert a new valve disc.
valve plug in the water.
bubbles indicate leaks.
facepiece, or replace leaking components.
O (10 mbar).
2
O (1 mbar) per minute,
2
O (10 mbar).
2
Dräger X-plore 6000