Adjusting The First Stage - Aqua Lung APEKS TX 50 Technical Manual

4
Thread the DIN connector
upwards into the first stage
body until snug.
CAUTION: The DIN connector must be held vertically
while being installed upwards into the body until snug.
Failure to do this can cause the o-ring not to seat properly
which in turn will create a high pressure leak.
5
Thread a vise mounting
tool into the first stage then
install into a bench vise. Using
a torque wrench with a 6mm
hex key adapter, torque the
handwheel connector (34) to
14.7 ft-lbs (20 Nm). Remove
the first stage from the bench
vise and remove the vise
mounting tool.

ADJUSTING THE FIRST STAGE

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 using compressed air.
1
Install o-rings (10,13,20)
onto all port plugs (9,18,19).
Using a 5mm hex key, install
the port plugs into the body and
tighten until snug.
2
Replace the o-ring on the male end of the MP hose. Thread
the hose into one of the MP ports on the first stage. Install the
MP test gauge (PN 111610) on the female end of the hose.
3
Attach the first stage to a
calibrated test bench or a
cylinder filled to 3000 psi (206
bar). Open the bleed valve
on the MP gauge.
CAUTION: Before pressurizing your first stage, check that
your MP test gauge has an overpressure bleed or bleed
valve. If it does not, you must attach a properly adjusted sec-
ond stage to the first stage to provide a safety bleed valve if
the MP exceeds 145 psi (10 bar). Failure to relieve increasing
MP may result in damage to the test gauge or the MP hose.
WARNING: If the pressure gauge rapidly exceeds 145 pis
(10 bar), there is a HP leak. Quickly close the cylinder valve
and purge the second stage or reopen the bleed valve of the
test gauge and close the cylinder valve. Failure to do so may
cause a rupture to the MP hose and/or MP gauge, which in
turn can lead to personal injury. Refer to Table 1: Trouble-
shooting Guide on p. 21 for the causes of high or unstable MP.
WARNING: Be certain not to install a MP hose into the HP
port via an adapter. Doing so may cause the hose to rupture
when pressurized, and could result in serious personal injury.
4
With the bleed valve open, slowly open the cylinder valve ¼
turn. While watching the gauge, close the bleed valve, if the
MP exceeds 145 psi (10 bar) quickly open the bleed valve and
close the cylinder. If the MP is stable and does not continue to
rise, open the cylinder valve all the way.
5
Adjust the MP using a 6mm
hex key. To increase the
MP, turn the adjustment screw
in ⅛ turn increments clockwise.
Using the bleed valve on the
gauge, cycle the first stage
several times after each
adjustment. To decrease the
MP, turn the adjustment screw
counter-clockwise. Set the MP
to 130-145 psi (9-10 bar).
11