Maintenance - Dräger FPS 7000 Instrucciones De Uso

(1) Checking leak tightness
1. Moisten the face seal and exhalation valve with water.
2. Mount the facepiece on the test head, use a holder suitable for
mask/helmet combinations, if necessary.
3. Make sure that the face seal fits tightly onto all parts of the test
head. Inflate the test head, if necessary.
4. Adjust the connector with adapter tightly and produce a negative
pressure of 10 mbar.
The facepiece is considered leak-tight if the pressure drop is less than
1 mbar per minute. If the facepiece is leaky, continue with (2).
(2) Test with sealed exhalation valve
1. Remove exhalation valve.
2. Plug in the exhalation valve test plug.
3. Generate a negative pressure of 10 mbar.
4. If the pressure drop is less than 1 mbar/min, remove the exhalation
valve test plug and insert a new valve disc.
5. Repeat the leak test (1). If the facepiece is leaky, continue with (3).
(3) Leak test under water
1. Immerse the test head including the facepiece with exhalation
valve test plug in the water.
2. Produce a positive pressure of approx. 10 mbar.
3. Slowly turn the test head under the water surface. Emerging bub-
bles indicate leaks.
4. Take the test head with the facepiece out of the water, repair the
facepiece or replace leaking components.
5. Remove the exhalation valve test plug and install the exhalation
valve.
6. Repeat the leak test (1).
Dräger FPS 7000
Checking the opening pressure of the exhalation valve
The opening pressure must be at least 4.2 mbar at a constant
flow of 10 l/min. If this opening pressure is not reached, turn
PE
the valve disc to remove dust particles or the like between the
ESA
crater and the valve disc. Repeat the test. If the opening pres-
P
sure is still not reached, replace the spring (Figure A3-27 on
page 3) and repeat the test.
4.4

Maintenance

1. Check all parts for deformation and damage and replace them, if
necessary.
CAUTION
!
Neither tighten nor remove the self-locking nut at the ball joint
of the mask/helmet adapter. Otherwise, the function of the
mask/helmet adapter will be impaired.
Both mask/helmet adapters can have a different moveability
in the ball joint which will not impair their functionality.
NOTICE
i i
During maintenance work, the exhalation valve cover can
break away from the cap (Figure A1-10 and 11 on page 3).
The exhalation valve cover can simply be hooked back into
the cap.
2. After maintenance work and/or replacement of components again
check the leak tightness.
(Certified by Dekra Exam)
Maintenance
27