LOW FUEL LEVEL SENSOR
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 1/4 NPT. 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.
The sensor needs to be mounted horizontally or vertically (pointing up only)
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.
Using a "small amount" of "Fuel Lube" on the threads ONLY, it is to be
screwed into a 1/4 NPT female fitting. "Fuel Lube" should guarantee no
leaks. Sensor will malfunction if "Fuel Lube" is contacting the sensor
DO NOT over torque!! (13.26 in.-lbs. (1.5Nm)) Max. It is
NOT important that the sensor hex nut bottom out on the female fitting.
After installing the sensor, we recommend using a small amount of "Pro-Seal"
or another brand of fuel tank sealant to help secure the sensor in place.
Applying a small bead around the outside of the sensor should guarantee it won't
back out, and may also inhibit future leaks from forming. This suggestion is
just a bit of extra insurance.
Here is an
AE Sensor ONLY spec. sheet that you may print.
Sensor Spec Sheet
See how to install the sensor.
PLEASE READ THIS before ORDERING!
NOTE: MOST automotive and aircraft BUS voltages are NOT guaranteed
to remain below 15.4Vdc.
This sensor cannot be operated
with a higher voltage than 15.4Vdc! It is for this reason that you MUST connect
the power to the sensor to a lower guaranteed 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. This power source is regulated and will most likely not go
You can even use a
Zener diode in series with the power
lead going to the red wire of the sensor to lower the voltage from a higher
regulated voltage source. The regulated source and the series Zener voltage value
must also regulate the sensor voltage so as to guarantee it will not go above 15.4V.
Also, DO NOT OVER TORQUE when
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Ohio Residents please add in 7.50%
Low Fuel Sensor ONLY, (LFSensor)
(Sensor operates from +4.5V to +15.4V.)
(Aircraft bus voltage is typically higher than +12V
and should NOT be used to power the sensor directly. See above warnings.)
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