Aqua Lung MRS III, Operation And Maintenance

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14.1.1. CAUTION: DO NOT CONTAMINATE THE MRS III BY USING CALIBRATION
APPARATUS THAT WILL PUT OIL INTO THE SYSTEM.
14.1.2 To calibrate the gauges without removing them from the unit will require you make 3
separate connections.
14.1.3 To test the supply pressure gauge you will need to
connect your master gauge to the refill port with a tee. There is a check valve on this port so the
air supply must come from the refill port and test gauge to the supply pressure gauge. This will
allow you to test the supply pressure gauge.
14.1.4 To test the regulated pressure gauges and the fill
pressure gauges you can connect your test gauge to
one of the fill lines (removing the PRS-21 for access
to a 1/4” NPT). Use air from the supply cylinders
or supply air thru the refill port to pressurize these
gauges. This will allow you to check the fill pressure
gauge on the side that you are connected on and the
regulated pressure gauge. Remove the test gauge;
reinstall the PRS21 and repeat on the other side for
the other fill pressure gauge.
14.2. If the gauges (GAG1) need to be removed simply
disconnect the tubing fitting (PRS10) from the back of
the gauge using a 7/16” wrench (figure 29). Always use
a 3/4” backup wrench. Then loosen the gauge bracket
with a small straight screwdriver. Once loose the bracket
will slip out of the gauge and the gauge will lift out of
the panel.
page 11
figure 27
figure 29
figure 28