Test for undissolved water level: open the test area cover located on
the bottom side of the water detector. Place the free-water pad (orange-
side down) in the test area window (see Figure 2.36.) Close the cover and
turn the water detector upright.
Figure 2.36 Placement of Free-Water Pad in Test Area Window
Turn the power setting knob to the appropriate power source (i.e.,
AC, external or internal battery). See Figure 2.21.
Depress the switch button on the instrument pack and adjust the
light-modulator lever until the meter reads 0.
Read the undissolved water level where the lever crosses the scale
NOTE: Free water, ppm = (meter reading, ppm) (500)/(sample volume, mL)
Record the reading to the nearest whole number as ppm by volume
of undissolved water in fuel.
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