TM 10-6640-215-13
2-8.
OPERATING PROCEDURES -continued.
(2) Set up the separatory funnel with its support base, rod and ring (see Figure 2-21, Detail A).
(3) Fill an aluminum dish one half full of water.
(4) Using a graduated cylinder, transfer exactly 160 ml. of the fuel (from step a.) to the separatory funnel.
(5) Using a piston pipet, add exactly 2 ml. of water from the aluminum dish to the separatory funnel. Cap funnel
and shake vigorously for 3 minutes. Place separatory funnel in support stand.
(6) Open cover of refractometer window (see Figure 2-21, Detail B). Ensure window is clean.
(7) Apply several drops of water from aluminum dish to refractometer window. Close cover and through
eyepiece observe location of shadow line in viewer. Using plastic adjusting rod contained in the
refractometers base, adjust setscrew located in the base so that shadow line intersects zero line of the scale
(see Figure 2-21, Detail C1). Refractometer is now correctly zeroed.
(8) Clean refractometer cover and window.
(9) Carefully rotate separatory funnel drain cock so that a trickle of fluid can be collected in clean dry aluminum
dish. Two to three drops is sufficient.
(10)
Open cover of refractometer window and transfer fluid from aluminum dish to refractometer window. Close
cover and observe position of shadow line. Figure 2-21, Detail C2 shows a typical test result for JP-4 fuel
treated with anti-icing additive at 0-.1% v. test run may show differently as fuel may have different % v. of
additive, but readings will be accurate and reflect fuel condition.
(11) Properly dispose of liquids. Wash apparatus with soap and water and dry thoroughly.
(12)
Report out of specification results at once.
NOTE
Refractometer should be treated as an optical instrument.
g.
Ice-Maker Operation. The ice maker unit is a plug-in unit powered by a hermetically sealed condensing unit.
(1) Ice Maker Set Up and Operation.
(a) Apply power to the ice maker by placing circuit breaker A1CB8, located in MAIN POWER PANEL in the
ON position.
2-56
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