Chapter 8: Appendix B: Setting Proportional Control; Proportional Control Overview - Blue I HydroGuard HG-302 Manual De Uso

Chapter 8:
8.1

Proportional Control Overview

The many variables that control pool chemical balance make each pool unique. These variables include:
•
Pool size
•
Capacity of dosing and filtration systems
•
Type of chemical used
•
Controller reaction time
The above variables affect two primary control characteristics:
•
Delay time between chemical dosing and when the controller senses these chemicals.
•
How strong a response a dose of chemicals produces in the controller.
Older pool water chemical controllers worked in basic on/off modes. The controller supplied chemicals at a
constant rate until it sensed that it reached the chemical balance set point. This type of operation caused
major fluctuations in water chemical levels, which wasted chemicals and caused chemical levels to cross the
desired high and low thresholds.
Figure 28: Chemical levels with ON/Off Mode Controllers
HydroGuard controls dosing proportionally. This method sets dosing rates in relation to how far current
chemical levels are from the set point. The dosing rates gradually decrease as chemical levels get closer to
the set point.
Appendix B: Setting Proportional Control
Figure 29: Proportional Control of Chemical Dosing
Set Point
Chemical Level Fluctuations
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