Final Assembly; Test In Water - Aqua Lung MISTRAL FIRST STAGE Service Manual

F I R S T T O D I V E
Turn the screw by increments of 1/8 of a turn and purge the
regulator several times, using the second stage, after each
increment. Adjust the MP (see Table 5).
Once the MP has been adjusted, purge the second
stage about ten times. When this is finished check the
pressure gauge. The MP should be stable at the desired
value (8.5b or 9.5b depending on the regulator). Make
any further adjustments that may be necessary. Leave
the regulator under pressure for several minutes and
check that the MP remains stable. If the MP rises more
than 0.3 bar this indicates that there is a leak. Refer to
Table 1. Troubleshooting Guide.
d. Close the cylinder valve and completely purge the
regulator. Put the regulator under pressure once more
and check that the MP is stable.
If the MP is different, repeat steps 3 and 4 until a stable
pressure is obtained.
FINAL ASSEMBLY (See Exploded
View 125900 for the yoke version
and Exploded View 125901 for the
DIN version)
Note: The following step should be carried
out with the regulator under pressure.
1. With the regulator under pressure, insert the piston (8)
into the dry chamber. Fit the diaphragm (9) fully into the
diaphragm screw (6 for the yoke version or 7 for the DIN
version and place the 2
a lug spanner (129198) tighten the screw fully home.
nd
stage on top of this (2). Using
2. Check that the MP is still stable (see Table 5)
3. Close the cylinder valve and purge the regulator.
Remove the MP pressure gauge and replace the MP
plug.
END OF REASSEMBLY

TEST IN WATER

Check that all the MP and HP plugs are in place and that a
correctly adjusted second stage is connected to the first
stage. Slowly open the cylinder valve to put the regulator
under pressure.
Immerse the first stage completely in water to check that
there are no leaks.
Note: Do not mistake any bubbles that are
trapped in the regulator with a leak. If there
is a leak there will be a constant stream of
bubbles.
When you are sure that there is no leak, close the cylinder
valve and purge the regulator. Remove the first stage from
the cylinder and refit the dust cap.
If a leak has been detected then note its source and refer to
Table 1. Troubleshooting Guide.
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