Leak Tests; Checking The Opening Pressure Of The Exhalation Valve (P-Type Connector Only) - Dräger FPS 7000 S-fix Instructions For Use Manual

4.3

Leak tests

The leak test should be performed with an appropriate test device
1)
(e. g. the Testor or Quaestor series ).
NOTICE
i i
When testing facepieces sized L or S, place the facepiece
carefully on the test head sized M, since the face seal is not
optimally sealed at times. Moistening the face seal facilitates
exact donning because the facepiece can slide better on the
test head.
(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
head. Inflate the test head, if necessary.
4. Seal the connector with the test adapter and produce a negative
pressure of 10 mbar (approx. 10 cm H
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 (approx. 10 cm H
4. If the pressure drop is less than 1 mbar (approx. 1 cm H
minute, 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 (approx. 10 cm
H O).
2
Dräger FPS 7000
3. Slowly turn the test head under the water surface. Emerging
bubbles 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 leak test (1).
4.4
The opening pressure must be at least 4.2 mbar (approx. 4.2 cm H
at a constant flow of 10 l/min. If this opening pressure is not reached,
turn the valve disc to remove dust particles, or the like, between the
crater and the valve disc. Repeat the test. If the opening pressure is
still not reached, replace the spring and repeat the test.
O).
2
O).
2
O) per
2
(Use Instructions for NIOSH-approved full facepieces)
Checking the opening pressure of the exhala-
tion valve (P-type connector only)
Maintenance
O)
2
257