Final Testing; Final Adjustment Procedures - Aqua Lung APEKS TX 50 Technical Manual

FINAL TESTING

External Leak Test
1
Using an in-lb torque wrench with a 9/16" crow-foot, torque
the MP hose to 40 in-lbs (4.5 Nm) to the first stage. Install a
properly adjusted second stage to the female end of the MP hose.
Connect the first stage to a cylinder filled to approximately 3000
psi (206 bar). Slowly open the cylinder valve to pressurize the
regulator and submerge the entire system in a test tank of clean
fresh water.
2
Observe any bubbles arising from the submerged regulator
over a one minute period. The recommended time is
necessary due to slower bubble formation that occurs in smaller
leaks. Bubbles indicate a leak, this would require the system
to be disassembled at the source to check sealing surfaces,
assembly sequence and component positioning in order to correct
the problem(s). If any bubbles are visible, refer to Table 1:
Troubleshooting Guide, p. 21
NOTE:
Do not confuse bubbles from trapped air with a true leak.
If there is an air leak, bubbles will come out in a constant stream.
3
If there are no leaks, close the cylinder valve and
depressurize the regulator. Remove the first stage from the
cylinder valve and secure the dust cap in place.
THIS CONCLUDES SERVICING OF THE
DST FIRST STAGE

FINAL ADJUSTMENT PROCEDURES

WARNING: Compressed air can be highly explosive and
is dangerous if misused. Ensure cylinder valve is opened
slowly. Use Eye and Ear Personal Protective Equipment
when performing any tests involving compressed air .
Adjusting Lever Height
1
Attach the in-line adjustment
tool (PN 100190) to the 2nd
stage. Attach the 2nd stage to
a properly adjusted first stage
or calibrated test bench. Slowly
pressurize the system to 3,000
psi (206 bar).
2
Make sure that the adjustment knob (23) is turned all the way
out and then ⅛ turn in and that the venturi lever (16) is set to
the "+" position.
3
Give a quick tap to the purge button. This should cause the
second stage to freeflow. Stop the freeflow after a couple of
seconds by placing a hand over the mouthpiece.
4
Place the end of the TX lever height tool (PN AT69) onto the
purge button (5) with the "NO GAS FLOW" up. Depress the
purge button by pushing the tool towards the second stage until it
stops against the front cover. If air does not flow from the second
stage, the lever height has been set correctly, proceed to step 6.
If air flows from the valve, proceed to step 5.
NO GAS
FLOW
5
Using the in-line adjustment tool, turn the seat (18) clockwise
approximately 1/16 of a turn. Repeat step 4.
19