(3)
"Alternating Flashing" - when pilot presses, "Push to
Test"
button
Lights can be dimmed by using
present aircraft dimmer bus.
Annunciation of low fuel level is
accurate
Audio output when low fuel level is
detected
System automatically tests itself at
power up
System is available for +12Vdc or
+24Vdc electrical systems
Immune to noise that occurs on
aircraft DC power bus
Single button functions as "System
Test and/or Alarm Acknowledge"
SAFER! The fuel is not
in contact
with your electrical system like
other systems!
Fuel sensing is damped so it does
not activate on fuel sloshing.
BENEFITS Why would you need a low fuel annunciator? Extra
Insurance. This is a totally redundant system. Many of the present fuel quantity indicators are inaccurate, especially when they get
down to measuring the low fuel levels. Some fuel level indicators do not have any
annunciation of low fuel level. Some mechanical fuel indicators occasionally stick
or fail. This system gets your attention before you have to
switch tanks. When the annunciator light flashes, you will know your
precise fuel quantity and also the time to engine shut-down for that tank.
PRODUCT FEATURES
Two annunciator panel lights
Two optical fuel sensors
One push button
Sensor drive &
annunciator electronics enclosure
Wiring - sensors to annunciator electronics enclosure
Lettering decals for many different fuel levels (black lettering)
HOW DOES IT WORK?
The optical fuel sensor is a non-contact sensor mounted in a single hole in the
fuel tank. It operates by bouncing a beam of light into the sensors lens.
If it is reflected back into the sensor, there is no liquid present. If it
is not reflected back, it is dissipated into the liquid media. The sensor
output is pulled down, or activated.
The electronics constantly monitors the sensor outputs of both tanks. When
a low fuel level is detected, the appropriate light starts to blink, getting the pilot's
attention immediately. After the pilot sees the alarm, he can press the acknowledge
button. This action turns the light on solid
(continuous) denoting a low fuel quantity. This function of the
annunciator eliminates the distracting flashing action of the lights for the
pilot, yet he can still see that he has a low fuel indication.
The AE Fuel Guardian also has an audio output. This can be wired into the
aircraft intercom or audio system if desired. The audio beep is only
present when the annunciator lights are flashing.
The AE Fuel Guardian annunciator lights can also be wired into the aircraft
dimmer bus if desired for night flight.
USE of OTHER FUEL LEVEL SENSORS
Can you use other fuel level sensors?
YES, if they are compatible with our sensor output. The output should be
an "open collector" or a TTL (0 to +5V) type output. The output must be
high in air, low in fuel. Please read below for 0 to 3.3V outputs.
Can you use a Pillar Point Fuel Sensor?
Well, maybe. The Pillar Point sensor has an output that is an open
collector output (BLU wire), but it is not compatible because it has the
opposite output response. The only output that is compatible, is the 0 to
+3.3V output (WHT wire). We have tested it and it does work. This
output is compatible with the AEFG.
It is really up to the builder or installer. There are several different
methods and installation strategies.
Some have set the sensors in each tank to sense at different fuel levels.
One pilot used the "IFR legal limit" of 45 minutes on one tank, and 30
minutes on the other tank at the aircraft 75% power cruise speed.
I used a 1.5 gallon level on both tanks. This was just to get my attention to change tanks before my
engine quit if I forgot. I flew a Cessna 150 for years and never had to
change tanks.
How do I install the sensors at the correct level?
