give me a dumbed down explanation of what each of these components do
Tank Unit
The Tank Sensor changes capacitance as the fuel level changes. Each
tank contains a series of tank sensor units. Each tank unit extends
from the top of the tank to near the bottom of the tank. Together the
combination of tank units provides a profile of fuel level in the tank.
Compensator
The Compensator changes capacitance as the dielectric constant of
the fuel changes. The dielectric constant is directly related to fuel
density.
Physically the Compensator is a short tank unit with a larger
diameter. This allows it to be mounted in the lowest part of the tank
The FQIS Processor uses the density value from both the
Densitometer and the Compensator. These values are compared for
accuracy. Fuel weight is computed from fuel volume, determined
from the tank units, and the density measured by the Densitometer
and Compensator.
Densitometer
The Densitometer provides a measure of density of the fuel in a
tank. This unit is tuned to a specific mechanical vibration based on a
nominal fuel density. As density varies from this nominal value, the
tuning of the Densitometer changes proportionally.
The Densitometer is mounted in the lowest part of the tank, where it
is always covered with fuel.