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|  MIL-R-85523A(AS)
pressure reducing regulator device is not in the same ambient conditions as the
oxygen breathing regulator, means shall be provided to determine the pressure at
the ambient conditions of the breathing regulator. When flow is started, the
inlet supply pressure shall not be allowed to drop more than 2 pounds per square
inch gauge (psig) for inlet pressure above 8 psig. When flow is started, under
no condition shall the inlet supply pressure be allowed to drop below 5 psig.
4.7.4 Orientation. The regulator shall operate as specified herein with the
regulator oriented in any position. Acceleration testing shall be conducted
using the orientations specified in Figure 5.
4.7.5 Inlet pressure. Unless otherwise specified, the regulator shall be
operated with an inlet pressure from 5 to 120 psig. A flow shall not be drawn
from the regulator when the inlet pressure is below 5 psig.
4.7.6 Vibratory control. Flutter dampers shall not be used to control or
eliminate output flow fluctuation.
4.7.7
Test equipment.
4.7.7.1 Test stand. All steady state flow and pressure tests should be
performed on a test stand model 62A-116-E1, 1172AS5100, or 1316AS100 or
equivalent. Regulators, when tested on other stands, shall be capable of
fulfilling all flow and pressure test requirements of this specification when
tested on the specified test stands. The outlet of the regulator shall be
connected to the test stand by an oxygen mask hose connector.
4.7.7.2 Piezometer assembly. The outlet pressure shall be measured using a
piezometer assembly conforming to drawing 62A116C48. The piezometer shall be
connected to the outlet of the regulator as shown in Figure 1. The regulator
outlet pressure shall be measured at the piezometer union shown in drawing
62A116C48. Regulators, when tested with other piezometers, shall be capable of
achieving the same pressures and flows as regulators tested with the specified
piezometer.
4.7.7.3 Noise level test set-up.
The test set-up for the noise level test
shall be in accordance with Figure 2.
The set-up shall include the following:
a.
Digital frequency analyzer
b.
Condenser microphone with 1 inch free field
c.
Condenser microphone preamplifier
d.
Graphic level recorder with voltage control paper drive
e.
Operation 2120 and 1614-10 synchronous or charge cable
4.7.7.4 Breathing simulator. All dynamic breathing tests should be
performed on a KRUG International breathing simulator model TS8225-PC or
equivalent. Regulators, when tested on other simulators, shall be capable of
fulfilling all flow and pressure test requirements of this specification when
tested on the specified breathing simulator. The simulator shall breathe through
an MBU-14/P oxygen mask secured to a head from with an airtight mask seal and
connected to the regulator by an oxygen hose connector conforming to MS27796.
Inlet pressure to the regulator shall be supplied through the regulator-to-seat
hose (24894/55072-3), seat kit hose (24894/55072-5), seat kit manifold assembly
(MBEU130049), and oxygen panel connector (24894/55054-7) from a reservoir held at
constant pressure.
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