Proportional dosing allows rapid dosing toward the set point. Proportional Dosing's default is OFF.
A maximum dose time must be entered as well as a minimum dose time. The maximum time should be set so that a dose of this size would raise the EC from its raw water value to 80% of the se tpoint value in a single dose.
The minimum dose time should be set to achieve a rise in EC of 0.1mS/cm (CF=1, ppm=50). The controller will then select the most appropriate dose size within this range depending on the measured EC.
This means that when starting with a tank of pure water, the controller will make one very large dose followed by smaller and smaller doses as the setpoint is approached.