TM 5-6640-212-14
tubes. Integral needle valves can be utilized at either inlet
NOTE
or outlet end. The Teflon stop provides easy replacement
The vast majority of readings that are
of floats. Stainless steel and sapphire floats are provided
taken on aviation fuels do not
for the three lower ranges. For the two upper ranges,
indicate the presence of any free
stainless steel black Pyrex floats are supplied. These
water. If the technician wishes to
can be used individually or combined. The triflat tubes
reassure himself that the detectorpad
are circular in cross section at the bottom and triangular
is effective and the instrument is
at the top. In between, the tube has a cross section
functioning, he can moisten his
which progressively changes from a circle to an
finger, touch it to the pad and view
equilateral triangle whose sides are tangent to the circle.
the pad in the instrument.
The balls which act as floats slide snugly in the tube at all
(8)
Scale conversion chart. The water
positions from top to bottom.
detector unit can be used to take undissolved or free
b. Operation.
water context readings regardless of the quality of fuel
(1) Set up the unit and transmit fluid to the unit.
that has passed through the detector pad. Figure 2-34
(2) As more fluid passes through the tube, balls will
gives the conversion from scale readings to water
rise and increase annular area between ball and tube.
content for different sample volumes from 100 to 500 ml.
(3) Balls will come to equilibrium at a point where
The figure can be used to obtain scale multiplying factors
the weight of the ball is equal to the force required to flow
for any sample volume, even if that volume is not an
the liquid through the annular area.
exact 100 ml increment. The unit can also be used to
(4) Obtain a generalized correlation of the flow of
read water content when detector pads are of a different
any liquid against the readings on the meter by plotting a
size than the ones that are supplied with the unit. The
flow coefficient against a viscous influence number for
standard detector pad is 25 mm in diameter, but other
different positions on the tube corresponding to its
pads are made that have a diameter of 37 and 47 mm.
readings. The only information required to obtain a
Be sure to use only 25 mm pads.
calibration for a given fluid is the density and viscosity of
CAUTION
the fluid under the conditions of flow. When both floats
The Aqua-Glo calibration may not be
are in the flowmeter, read either one, referring to its
accurate if additives are present. For
proper column in the calibration chart.
example, certain additives used in
2-45. Fuel Sampling Kit.
heating oils will prevent water that is
a. Description. The fuel sampling kit, contained in
not dissolved in the fuel from
a carrying case, is stored in drawer D5 (figs. 1-2 and B-
reacting with he sodium fluorescein.
10). It is designed to comply with the requirements
(9)
Condition: 25 mm test pads. Example: A
specified in ASTM Method D2275 (TM 10-1166). The
scale reading of 6 is recorded on a fuel damp, 25 mm
unit is used for field sampling of liquids from pressurized
test pad. The sample volume was 100 ml. Read up from
systems by means of millipore fuel monitors. The
the scale reading of 6 to 100 ml curve. Then read on the
contaminant retained on the test filter held in the monitor
left-hand scale 30 ppm water content. Refer to TM 5-
is retained for subsequent analysis. The sampling kit
6630-216-12 and to FM 10-70 for complete instructions
contains a stainless steel holder (sampler assembly) for
covering the water Detector Kit, Automotive Aviation
the monitors, and the tubing, connectors, and
Fuel.
accessories required to perform the sampling operation
2-44. Flowmeter Kit.
and prepare the monitor for subsequent analysis. The
a. Description. The Manostat flowmeter kit,
monitors are disposable plastic filter holders made of fuel
housed in a carrying case, is stored in drawer D3 (figs. 1-
resistant Tenite and preloaded with 37-millimeter filters.
2 and B-10). The unit is designed to accurately measure
b. Operation. Follow detailed instructions imprinted
flow rate and permit calculation of the calibration curve
on the plastic card mounted inside the kit case. Refer to
without conducting experimental calibration. Calibration
ASTM Method D2276 (TM 10-1166) for detailed test
charts are supplied for air and water. Correction charts
procedures.
are included for rate observation of gases and liquids
other than air or water. The flowmeter kit consists of four
flowmeters and housing with removable stand for
countertop use or for panel or support mounting. No
tools
are
required
for
changing
2-65
