Figure 5-3. Typical setup for purging and charging periscope XM47.
b. Final Test.
(8) Slowly rotate valve of the pressure
regulator clockwise until low pressure gage indicates 5
(1) Rotate valve of pressure regulator fully
psi. Allow the nitrogen to flush the assembly for 5
counterclockwise to stop the flow of nitrogen. Close the
minutes.
valve of the nitrogen cylinder and remove the hose from
(9) Install gasket (9, fig. 5-2) and machine
the valve of the charged assembly.
thread plug (8) securely in housing assembly.
(2) Connect hose assembly (5) to dial
(10) Apply a water and soap solution around
indicating pressure gage (6).
optical elements, the valve, the plug and check for leaks.
(11) .Reduce the pressure to 1 psi by slowly
rotating valve of the pressure regulator counterclockwise.
Charge for two minutes.
5-5
