2-12. OPERATING PROCEDURES - continued.
Using graduated cylinder, transfer exactly 160 ml. of the fuel (from step 1)
to the separator funnel.
Using a piston pipet, add exactly 2 ml. of water from the aluminum dish to
the separator funnel. Cap funnel and shake vigorously for 3 minutes.
Place separator funnel in support stand.
Refractometer should be treated as an optical instrument.
Open cover of prism face (see Figure 2-16, Detail B). Ensure prism face is
Apply several drops of water from aluminum dish to prism face. 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 2-16, Detail C1). Refractometer is now correctly zeroed.
Clean refractometer cover plate and prism face with lint free cloth.
Carefully rotate separometer funnel drain cock so that a trickle of fluid can
be collected in clean dry aluminum dish. Two to three drops is sufficient.
Open cover plate of prism face and transfer fluid from aluminum dish to
prism face. Close cover and observe position of shadow line. Figure 2-16,
Detail C-2 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.
Properly dispose of liquids. Wash apparatus with soap and water and dry
Report out of specification results at once.
Sampling and Gage Kit Operation (Cabinet No. 5). (Refer to Figure 2-17). This kit is
completely portable and self-contained. It consists of the carrying case, which is divided into
section to hold the major items of equipment, an API gravity computer, a cupcase thermometer,
a hydrometer cylinder, gasoline indicating paste, water indicating paste, innage tape and bob,
a weighted beaker sampler, and thermal hydrometers. Set up the kit for operation as follows:
Clean innage tape with cheesecloth. Ensure equipment is clean, dry, and
free of dirt.
Check mercury columns in hydrometer and cupcase thermometer. If
mercury column is separated or glass cracked, replace the instrument.