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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