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Test Kit for Captured Fuel
TM 5 6630 217-10
Specific Gravity Measurements (cont.)
This is an unacceptable or "NOGO" fuel. The tester is appropriately labeled
with "GO" and "NOGO" positions The specific gravity system is temperature
compensated because the specific gravity of the density indicator relative to that
d the sample will remain constant. (Because the container allows for the
density vs. temperature changes and the fluid is similar to the fluid under test.)
Adequate time must be allowed for the indicator to become the same
temperature as the fuel under test.
Viscosity Measurement
Viscosity measurement is by means of "submerged orifice falling column
comparative viscometers." Three parallel viscometer tubes are utilized. The
middle tube is open to receive the unknown fuel. The tubes on either side are
sealed and contain hydrocarbon fluids that represent the lower and upper limits
of acceptable viscosity (1.3 and 5.0 centistokes at 40 degrees Celsius).
The length of the tubes has been kept to a minimum, however they are long
enough to allow sufficient time for the liquid columns to fail and give an
adequate reading. The viscometer will be operated by first removing the
instruction card and placing the test kit on it back (card holder down) on a level
surface to allow the columns to fill with fluid and lose all bubbles. The kit is
then raised to an upright position (caps down) so that all the columns start to
fall at the same time. Acceptability is indicated by the lower limit column
(mounted on the left facing the operator) reaching the bottom first; the test
sample column (mounted In the middle) reaching the bottom second; and the
upper limit column (mounted on the right) reaching the bottom last. The three
tubes are marked as follows from left to right: "1", "2", and "3". Acceptability or
"GO" requires that the columns fall In the order 1-2-3 any other order to fail is
considered unacceptable or "NOGO".
Visual Contamination Level Measurement
Fuel contamination In the form of suspended solids and emulsified water will be
measured by means of a visual indicator. The indicator is in the fourth module
of the tester and shares this module with the specific gravity indicating
densimeter. The back side of the module is marked with a rectangular grid of
black lines on a white background.
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