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Calibration Issues:Calibration Issues:
Calibration Issues:Calibration Issues:
Calibration Issues:
The FL-2 must be calibrated to the left and right fuel tanks separately. You may calibrate the FL-2 in gallon,
pounds, liters or any other unit you choose. Whatever units you calibrate the FL-2 in, is the units it will display
in. For this procedure we will use gallons.
The FL-2 can be calibrated for 4 gallon tanks or as large as 999 gallon tanks. The left and right tanks do not
have to be the same size or shape.
The FL-2 can be calibrated with as few as two points (full and empty) or as many as 9 points. The calibra-
tion points provide the FL-2 with a fuel sensor output for a specific fuel level. The output of a fuel sensor will be
resistance for a resistive fuel probe or a frequency for the Electronics International capacitive probe. In either
case, the output of the fuel probe is converted to an arbitrary count we call “Sensor Counts”.
As the fuel level in the fuel tanks increase, the Sensor Counts displayed on the FL-2 will increase (provided
you have programmed the FL-2 with the proper operating mode). Some common problems with fuel tanks are
listed below:
1. As you add fuel to an empty tank, it will take a certain amount of fuel before the resistive float starts to
move off the bottom of the tank or off the bottom end stop. For a capacitive system, it takes a certain
amount of fuel to reach the center electrode. Fuel levels below this point cannot be measured.
2. As you add fuel and the fuel level nears the top of the tank, the float on a resistive sensor will hit the top
of the tank or the top end stop. For a capacitive system, the fuel level will exceed the center electrode.
The fuel above this point cannot be measured. Therefore the FL-2 may not read a full tank.
These problems can cause accuracy issues for any system. To improve the accuracy of the FL-2, we recom-
mend you set 5 calibration points, empty, ¼, ½ , ¾, and full. By doing this, any issues at the full or empty fuel
levels will not effect the accuracy between the ¼ and ¾ fuel levels.
Another common problem with fuel gauges is they may not display a full tank after calibration. If the FL-2
has this problem, slightly reduce the
Sensor Counts for the full fuel level calibration point. To calculate how
much to reduce the counts, divide the change in the Sensor Counts between two cal points (near 1/2 tank) by the
change in the fuel level between the same two cal points. The FL-2 allows you to change the fuel level or the
Sensor Counts for any calibration point without having to add or remove fuel from the tank. You can also
recalibrate any calibration point at any time.
On power-up the FL-2 checks the left tank’s calibration data and then the right tank’s calibration data. If
there is any errors in the left tank's calibration, the FL-2 will report the error and stop operation. Therefore, if you
need to recalibrate both tanks, start with the left tank and resolve all reported errors before calibrating the right
tank.
(25 pages)
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