Table 12.2 gives the liquid levels, resistance values with the potentiometer
in parallel with the 6.66 kΩ resistor, and the output voltage for the
circuit in Fig. 12.9b. The new values are also plotted in Fig. 12.9a as the compensated
curve. The best-fit straight line (dashed) gives an error of less than
±5 percent showing the improved linearity with simple conditioning. The output
voltage from the float sensor can also be compensated by the control processor
before being fed to other elements in the system.
An alternative to the float attached to an arm is