TM 5-6640-212-14
b. Operation. Refer to ASTM Method D217 (TM
d. Reading Test Results.
10-1166) for detailed test procedures.
CAUTION
2-43. Water Detector Kit, Automotive/Aviation Fuel
A pad must never be dried in air
(Aqua-Glo Series II).
because it will pick up moisture from
a. Description. The portable, self-contained water
the air. A desiccator must be used if
detector kit (NSN 6640-00-244-9478) (fig. 1-2 and B-9) is
the pads are to be dried. Fuel clamp
used to detect the presence of undissolved water in
means; a detector pad that has been
automotive and aviation fuel in accordance with ASTM
pressed between paper towels as
Method D3240. It is battery powered and detects the
described in step (2) below.
presence of water within 1.5 parts per million (ppm). The
fluorescence of a sample-soaked pad is automatically
(1)
Open the detector pad holder and
compared by a double photoelectric cell circuit with a
remove the detector pad with tweezers. The point of the
permanent fluorescing standard. An ultraviolet light
tweezers can be inserted under the pad through the
source is adjusted until a responding microameter reads
notch in the rin of the recess.
zero, which means that the sample and standard pads
(2)
Press the detector pad between dry
are glowing with equal intensity. The ultraviolet light
paper towels to remove excess fluid. Press firmly (about
source level crosses a scale and produces the test result
5 lb.) three or four times with heel of the hand, moving
readings.
the pad with tweezers to a dry spot each time.
b. Flushing the Detector Pad Holder.
(3)
Place the fuel-damp test pad under the
(1)
Connect the detector pad holder
flap on the bottom of the unit with yellow side facing
assembly to the quick-disconnect coupler at the test
inward.
point.
(4)
Mount the meter assembly on the side of
(2)
Flush at least 1 gallon (3.785 liters) of
the unit by sliding it into the tracks provided. Turn on the
sample through the assembly. Open and close the valve
Aqua-Glo lamp by following the directions on the battery
several times while flushing is taking place.
cover.
(3)
Close the toggle valve and remove the
NOTE
entire assembly by disconnecting it at the quick
Never leave the light on except while
disconnect coupler.
a reading is being taken; the battery
c. Exposing the Sample Pad.
will provide only 1 hour of light, and it
(1)
Open the detector pad holder and
takes 14 to 16 hours to recharge the
remove a 25 mm detector pad from its sealed envelope
battery.
using tweezers.
(2)
Press the pad into the recess of the
(5)
Adjust the lever on the back of the unit
outlet half of the sample holder housing with yellow side
until the meter reads zero when the switch button on the
exposed.
meter is depressed.
(3)
Reassemble the detector pad holder by
(6)
Interpreting test results. The scale reads
screwing both halves together firmly by hand.
in parts per million where the lever crosses it if the test
(4)
Reconnect the assembly at the quick-
sample is 500 ml. The scale multiplying factor is 5 if a
disconnect coupler. Open the toggle valve and allow 500
100-ml test as sample is used. The scale is calibrated for
ml of test fluid to. pass through the detector pad.
a fuel-damp test pad. Divide the scale reading by 1.2 if
NOTE
the test pad is read when it is not fuel-damp and if the
A 500 ml test is necessary for
water content is in the range of 1 to 8 ppm. A factor of
accurate results in the range of 1 to
1.3 should be used if the water content is more than 8
10 ppm of water. A 100 ml test is
ppm when the pad is dry.
suitable for determination of water
(7)
Storing exposed pads. Exposed pads
content up to 13 to 60 ppm.
can be stored for long periods if kept in desiccant-dried
(5)
Close the toggle valve and remove the
containers. They change appreciably in open containers
entire assembly by actuating the quick-disconnect
or envelopes.
coupler.
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