MIL-DTL-19328F
3.3.3 Capacity sensing element. The capacity sensing element shall consist of an electrical capacitance
having characteristics that provide for a linear relationship between electrical capacitance and volume sensed. The
element shall be designed for use with indicator system components to indicate the amount of liquid oxygen in the
liquid oxygen container and shall be an integral part of the container, but may be either removable or permanently
installed. The element shall not be electrically grounded to the container. The interference limits shall be in
accordance with MIL-STD-461 and MIL-STD-462.
3.3.3.1 Electrical connectors. The high impedance sensing element lead shall be terminated in a connector
conforming to MIL-C-25516, B polarity. The low impedance lead shall be terminated in a connector conforming
to MIL-C-25516, E polarity. The connectors shall provide waterproof connections. The connectors shall be
provided with dust caps and tethered to the converter. Storage clips shall be provided for these caps near the
electrical connectors.
3.3.4 Combination fill-buildup-vent valve. The combination fill-buildup-vent valve, as a component only,
shall meet the performance requirements of MIL-V-25961.
3.3.5 Relief valve. The relief valve, as a component only, shall meet the performance requirements of MIL-
V-9050, Type II.
3.3.6 Pressure control valve. The pressure control valve to be used shall be a pressure closing valve.
3.3.7 Test port. A test port with a cap and tether shall be incorporated in the tubing and located in such a
manner that the entire converter assembly can be pressurized through the test port.
3.3.8 Overpressure safety device. A frangible safety disc or other secondary overpressure device shall be
incorporated in the plumbing of the converter at a location to insure rapid dumping of the head pressure from the
converter in the event the pressure relief valve fails to open. The overpressure safety device shall be designed to
remain in the open position if actuated.
3.4 Cleaning.
3.4.1 Preassembly of converter. Prior to the assembly of the converter, the internal and external surfaces of
the components shall be degreased in accordance with MIL-STD-1359 or qualifying activity approval of the
contractor's procedure.
3.4.2 After welding and brazing. After all welding and brazing operations have been completed, all weld
areas shall be cleaned, and weld spatter shall be removed by suitable mechanical or abrasive cleaning techniques.
All flux residue shall be thoroughly removed in order to preclude corrosive effects which may occur undetected
beneath the paint and result in early failure of the converter in service. The cleaning solutions and the processes
that are used shall be compatible with the converter and its expected service life.
3.4.3 Purging. The completed converter, prior to preparation for delivery, shall be purged with hot, dry
oxygen, conforming to MIL-O-27210, Type I or nitrogen conforming to BB-N-411, Type I, Class 1, Grade B, until
all traces of the contaminants are removed. The temperature of the purging gas shall not exceed 250 F (121 C) at
the converter inlet. The purge pressure shall be 50 + 5 psig (345 + 34 kPa). After purging, charge the container
with gaseous oxygen at 25 + 5 psig (172 + 34 kPa) and close all openings with approved closures.
3.4.4 Odors. The interior of the converter shall be substantially free from odor. The converter shall be free of
toxic gases or by-products.
3.5 Identification of product. The converter shall be marked for identification in accordance with MIL-STD-
130.
3.5.1 Vacuum performance plate. A metal plate shall be attached to the converter to provide spaces and
columns to show results and dates of evaporation loss tests. The plate shall provide sufficient space for
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