MIL-DTL-19803G
Sensing element
Electrical connectors
Combination fill-buildup-vent valve
Relief valve
Secondary overpressure safety device
Pressure control valve
Mounting base
3.4.1 Components and hardware. The design of the components and associated hardware
shall be such that the assembly/disassembly of the converter can be accomplished without the
use of any special tools. All components and hardware shall be designed, protected, or
positioned to prevent chafing due to normal service, shipping, and handling environments. Tube
assemblies and warming coils shall be a minimum of 0.0625 inch (1.58 mm) from the container
outer shell.
3.4.2 Container. The container shall be designed to contain a minimum of 10 liters of
liquid oxygen measured at 1 atmosphere (101.3 kPa). The container shall be designed such that
in case of contamination the container can be easily and completely cleaned by Overhaul and
Repair servicing personnel and then returned to service status. If the container employs a
vacuumized space as insulation, it shall be provided with a functional adsorbent. The container
shall be baffled to prevent direct exit of liquid oxygen through the vent line during initial stages
of the filling operation.
3.4.3 Container outer shell. The outer shell of the container shall be provided with a
rupture point having not less than a 0.375 inch (9.525 mm) diameter escape area. Pressure
required to rupture the escape area shall be at least 20 percent less than the burst pressure of the
outer container shell. The rupture point shall be located in such a position that in case of rupture
the danger to personnel shall be at a minimum.
3.4.4 Sensing element. The 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. The sensing element shall
be an integral part of the container and shall be permanently installed. The sensing element shall
not be electrically grounded to the container. The interference limits shall be in accordance with
MIL-STD-461.
3.4.4.1 Electrical connectors. The high impedance sensing elements lead shall be
terminated in a connector conforming to MIL-DTL-25516, B polarity. The low impedance lead
shall be terminated in a connector conforming to MIL-DTL-25516, E polarity. The connectors
shall provide waterproof connection. The connectors shall be provided with dust caps connected
to the converter by a chain or linkage arrangement. Storage clips shall be provided for these caps
near the electrical connectors.
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