Apeks MTX-R User Manual

15
MTX-R 2nd Stage Maintenance Manual
This Ends Final Testing
Second Stage Opening Effort Test
1. Connect the rst stage regulator with an interstage
pressure gauge tted to a calibrated test bench and
pressurise the system to 207 bar. Fit the 2nd stage
onto the Magnehelic mouth piece connector. Slowly
open the owmeter control knob (start vacuum)
while watching both the magnahelic gauge and the
intermediate pressure gauge.
2. When the intermediate pressure begins to drop,
indicating the second-stage valve is open, the
magnahelic gauge should indicate an opening effort
of +1.9 in.H2O (4.7 mbar) to +2.1 in.H2O (5.2 mbar).
If the reading is outside of these specications, adjust
the Screw Adjuster (27), turning clockwise to increase
the opening effort or anti-clockwise to lower the
opening effort. If this fails to give the correct reading
refer to “Table 1 - Troubleshooting” for corrective
actions.
External Leak Test
1. After disconnecting the regulator from the
ow bench, connect it to a gas cylinder lled to
approximately 200 bar. Open the cylinder valve to
repressurise the regulator, and submerge the entire
system in a test tank of clean 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, which requires the system to be
disassembled at the source to check sealing surfaces,
assembly sequence and component positioning in
order to correct the problem(s).
NOTE: Extremely small leaks may be better
detected by applying a soap solution or Snoop™
to the leak area. Bubble streams will indicate
the source of the leak. Before disassembling
to correct any leaks, rinse the entire regulator
thoroughly with fresh water and blow out all
residual moisture with ltered, low-pressure air.
Disassemble and remedy the problem, referring
to “Table 1 - Troubleshooting.”
Subjective Breathing Test
Depress the Purge Button fully to ensure that an
adequate volume of air needed to clear the second
stage ows through the mouthpiece. Then, inhale
slowly but deeply from the mouthpiece. A properly
serviced and adjusted regulator should deliver air upon
deep inhalation without excessive inhalation effort,
freeow, or “uttering” of the second-stage diaphragm.
When exhaling, there should be no uttering or sticking
of the exhalation valve. If any of these problems occur,
refer to “Table 1 - Troubleshooting”.
3. With the 2nd stage
still attached to the
Magnehelic mouthpiece,
turn the air supply off,
the vacuum gauge
should read above
100mm Hg (53.5” of
water).
NOTE: If the Magnehelic being used isn’t tted
with a vacuum gauge you will need to perform
the test orally. Place your thumb over the
inlet tting and inhale in normally through the
mouthpiece. If you can draw air in or hear air ow
refer to the trouble shooting guide on page 19.
NOTE: The image
shows the 1st
stage attached to
a high pressure
extension and not a
cylinder.

Apeks MTX-R Specifications

General

Brand	Apeks
Model	MTX-R
Category	Controller
Language	English