sensor is an optical low fuel sensor. This sensor was carefully chosen to
monitor aircraft fuel level. It works great in the harsh environment of
the fuel tank area and has a proven track record. The output is high when the
sensor is in the air, low when in liquid. Please check with us to see a list of
products that utilize this sensor. The sensor comes with an appropriate
nut and washer. The sensor threads are 12mm x 1.0. The leads are
about 5" long.
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. Lots of people ask if it works in a
"T" fitting instead of mounting it in the fuel tank area, YES! You just
need to allow enough space so the tip of the sensor is away from the wall of the
fitting. It also needs to be mounted horizontally so that a drop of fuel
does not accumulate on the tip of the sensor, otherwise it will still sense it
is full of fuel.
Here is an
AE Sensor ONLY spec. sheet that you may print.
This sensor cannot be operated
with a higher voltage than 12Vdc! Most automotive and aircraft bus
voltages are higher than this. It is for this reason that you MUST connect
it to a lower voltage. Not to worry, it is pretty easy to remedy this.
You can use a 12V regulator like the LM7812 or LM78L12. You can get these
most anywhere. You can even use a zener diode in series with the power
lead going to the red wire. The voltage value of the zener must guarantee
that the voltage will not go above 12V. I have used a 3V to 4.7V zener for
my applications. See typical wiring diagrams.
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