Electronics International FL-1 - Manual (Page 5)

3
Operating Instructions Operating Instructions Operating Instructions Operating Instructions Operating Instructions
FL-1RA & FL-1CA FL-1RA & FL-1CA FL-1RA & FL-1CA FL-1RA & FL-1CA FL-1RA & FL-1CA
Instrument: Instrument: Instrument: Instrument: Instrument:
The FL-1 is a fuel level instrument featuring a 210 degree analog display and a digital display. These
two displays provide the primary indication of the fuel level for the tanks and offer many advantages over
conventional analog gauges, as described below. The FL-1 must be calibrated in gallons and it can display
in pounds or liters. When displaying in pounds the FL-1 uses a "6 x Gal" conversion factor and when
displaying liters it uses a "3.75 x Gal" conversion factor. When displaying gallons the FL-1 may be pro-
grammed to display in one or 1/2 gallon increments. For fuel levels above 99 gallons the FL-1 will display
in one gallon increments only. Since the FL-1 does not incorporate any moving parts (needles, bearings,
springs, etc.) there is little to go wrong or wear out.
The FL-1 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-1 connects to a fuel level sensors mounted in the fuel tank. The FL-1RA-12 and FL-1RA-24
was designed to be used with a resistive fuel level sensor 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-1CA was
designed to be used with E.I.'s capacitive fuel level sensor and it will operate on a 12 or 24 volt system.
Once the FL-1 is installed in the aircraft it must be calibrated to the aircraft fuel tank and sensor 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 tank removes any non-linearity in the tank and sensor.
Analog Display: Analog Display: Analog Display: Analog Display: Analog Display:
The 210 degree analog displays provide a quick reference of the fuel level. 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-1 provides the following warnings:
1. 1/17 Tank Warning - 1/17 Tank Warning - 1/17 Tank Warning - 1/17 Tank Warning - 1/17 Tank Warning - If the tank level reaches 1/17 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 tank level reaches 1/17 or 2 gallons (whichever is greater), the 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 fuel tank sensor becomes open, the analog display will show an empty
and the digital display will show "OPEN." This warning is intended to alert you when the FL-1 has
lost the signal from the fuel sensor.