Electronics International FL-2 - Manual (Page 24)

4. As you lower the sensor float slightly slightly slightly slightly slightly from the top of the tank, the resistance should start to
increase. If it does not, the sensor resistance is probably bottomed out. The FL-2 will read lower
than actual fuel levels until the sensor wiper drops onto the resistive element.
With the sensor float held to the top of the tank, adjust the sensor float arm so the wiper is on the
resistive element and not on the termination (end stop). You will need an ohmmeter to determine
this. As you slightly move the float arm, the resistance should change.
B. For resistive fuel sensors that increase resistance when fuel is added perform the following tests:
1. With the float at the bottom of the tank (as it would be if the tank
was empty), measure the resistance of the fuel sensor . The resis-
tance should measure 1/4 or less of the total sensor resistance. If
the readings are higher, you may need to adjust the sensor float
arm. Prior to doing this, read tests 3 and 4 below.
2. With the float at the top of the tank (as it would be if the tank was
full), measure the resistance of the fuel sensor. The resistance
should be between 270 ohms and 90 ohms. If the readings are
below 90 ohms or greater than 270 ohms, you may be using the
wrong type of sensor. Use a sensor that increases resistance when
fuel is added and has a maximum resistance of between 90 and 270
ohms.
3. As you raise the sensor float slightly slightly slightly slightly slightly off the bottom of the tank, the resistance should start to
increase. If it does not, the sensor resistance is probably bottomed out. The FL-2 will read lower
than actual fuel levels until the sensor wiper drops onto the resistive element.
With the sensor float held to the bottom of the tank, adjust the sensor float arm so the wiper is on
the resistive element and not on the termination (end stop). You will need an ohmmeter to
determine this. As you slightly move the float arm, the resistance should change.
4. As you lower the sensor float slightly slightly slightly slightly slightly from the top of the tank, the resistance should start to
decrease. If it does not, the sensor resistance is probably topped out. The FL-2 will read lower
than actual fuel levels until the sensor wiper drops onto the resistive element.
With the sensor float held to the top of the tank, adjust the sensor float arm so the wiper is on the
resistive element and not on the termination (end stop). You will need an ohmmeter to determine
this. As you slightly move the float arm, the resistance should change.
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