TM 10-4930-351-14
0007 00
OPERATING PROCEDURES (Continued)
12. Test for undissolved water in aviation fuel (AQUA GLO Test).
WARNING
Micro filters are prolific generators of static electricity. It is essential that no unbonded
metal components are present during filtration since they concentrate and develop voltage
sufficient to cause static discharge within the test apparatus. This procedure requires that
all metal parts and the receiver must be electrically bonded together. The fuel test apparatus
and receiver must be grounded to a known ground. Death or personal injury may result
from improperly grounded or bonded components.
NOTE
The following procedure is applicable for dynamic line samples only. The fuel is to be taken
directly from the system under test, through the test pad without exposing the sample to the
atmosphere or to a sample container.
a.
Calibrate water detector (figure 7, 8).
NOTE
Calibrate the water detector prior to use each day, after each hour of use and when the ultra violet
light is replaced or the batteries are recharged.
(1) Verify a calibrated standard is in the water detector (figure 8, 1) window labeled TEST PAD HERE (2). Note
the "Set" rating recorded on the calibrated standard.
(2) Install the instrument pack (figure 7, 7) on the back of the water detector (figure 8, 1).
(3) Place the power selector (3) on the water detector (1) to the desired position (e.g., ON-INT.BAT).
(4) Move the light modulating lever (4) below the power selector (3) fully to one side or the other.
(5) Press and hold the light button (5) located on the back side of the instrument pack (6). Hold the light button (5)
until the indicator needle (7) on the instrument pack (6) is steady for 10 to 15 seconds.
(6) When the indicator reading has been steady for 10 to 15 seconds, slowly move the light modulating lever (4) on
the water detector (1) in the opposite direction, until the indicator needle (7) on the instrument pack (6) is at
zero. Always move the light modulating lever (4) in the same direction when zeroing the water detector (1) in
calibration or testing to eliminate errors caused by play in the lever.
(7) When the indicator needle (7) has been zeroed, observe the number directly below the light modulating lever
(4) on the water detector (1). Compare the number below the lever with the "Set" rating on the calibrated
standard. The lever position and the "Set" point should match.
(8) If the reading in step (7) above does not agree with the calibration pad rating, adjust the water detector (1) in
the following manner:
(a) Remove the plug screw on the side of the instrument pack (6) at the 45 degree bend.
(b) Insert a small screwdriver (8) and adjust the reading to correspond with the calibration set point rating.
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