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Operating InstructionsOperating Instructions
Operating InstructionsOperating Instructions
Operating Instructions
FL-2RA & FL-2CAFL-2RA & FL-2CA
FL-2RA & FL-2CAFL-2RA & FL-2CA
FL-2RA & FL-2CA
Instrument:Instrument:
Instrument:Instrument:
Instrument:
The FL-2 is a fuel level instrument featuring dual 90 degree analog displays and a digital display. These two
displays provide the primary indication of the fuel level for the left and right wing tanks and offer many advan-
tages over conventional analog gauges, as described below. The instrument may be calibrated to display in
gallons, pounds or liters. If the FL-2 is calibrated for gallons, the instrument may be programmed to display in
one or 1/2 gallon increments. For fuel levels above 99 gallons the FL-2 will display in one gallon increments
only. Since the FL-2 does not incorporate any moving parts (needles, bearings, springs, etc.) there is little to go
wrong or wear out.
The FL-2 has a programmed filter that effects how the instrument responds to changes in fuel level. The
filter may be set to 8, 16, 32, 64 or 128 seconds response. In the installation section of this manual is a discussion
of the advantages and disadvantages of the different filter settings.
The FL-2 connects to two fuel level sensors mounted in the left and right wing tanks. The FL-2RA-12 and
FL-2RA-24 was designed to be used with resistive fuel level sensors that decrease or increases in resistance as
fuel is added to the tank. The -12 is for a 12 volt system and the -24 is for a 24 volt system. The FL-2CA was
designed to be used with E.I.'s capacitive fuel level sensors and it will operate on a 12 or 24 volt system.
Once the FL-2 is installed in the aircraft it must be calibrated to the aircraft fuel tanks and sensors by filling
the tanks to predetermined fuel levels. You may use as few as two calibration points or as many as 9 points. This
mapping of the tanks removes any non-linearity in the tanks and sensors.
Analog Display:Analog Display:
Analog Display:Analog Display:
Analog Display:
The dual 90 degree analog displays provide a quick reference of the left and right fuel levels. More precise
information is provided in the digital display. An advantage of the analog display is its ability to emit a green,
yellow or red light. With a quick glance you can determine if your fuel level is in the green, yellow, or red
operating range. In addition the FL-2 provides the following warnings:
1.
1/4 Tank Warning -1/4 Tank Warning -
1/4 Tank Warning -1/4 Tank Warning -
1/4 Tank Warning - If the left or right tank level reaches 1/4 of a tank, the appropriate yellow LED will
blink. This is intended to alert you that the fuel level is getting low.
3.
Low Fuel -Low Fuel -
Low Fuel -Low Fuel -
Low Fuel - If the left or right tank reaches 1/8 of a tank or 2 gallons (whichever is greater), the appropri-
ate red LED will blink. This is intended to alert you that the fuel level is getting very low.
4.
"OPEN" - "OPEN" -
"OPEN" - "OPEN" -
"OPEN" - If the wire to the left or right fuel tank sensor becomes open, the analog display for the tank
with the problem will show an empty and the digital display will show "OPEN." This warning is intended
to alert you when the FL-2 has lost the signal from one or both of the fuel sensors.
(25 pages)
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