Blue I HydroGuard HG-302 Manual De Uso página 162

If water chemical levels are far below the set point, HydroGuard will control the dosing systems to operate at
full capacity (100%). As the controller senses chemical levels rising and getting closer to the set point, it will
control the dosing systems to slow down to a lower capacity (60%). As chemical levels get even closer to the
set point, the dosing system will slow down even more (30%), and so on, until the chemical level gets to the
set point.
With proportional only control, it is difficult to reach the set-point in larger or more heavily used pools
because the dosing rate slows too early. Conversely, in small pools or spas the set-point may be exceeded
because the dosing did not slow early enough. The P-factor allows the controller to be customized to the
specific pool. The % of the time on is explained by the following equation with chlorine as an example:
%time
In this example, the Cl set-point and measured values are:
If the P-factor is changed, the percentage of the pump cycle that will be on (% time on) changes as follows:
The range for P-factor for Cl and pH are presented in the table below.
Cl p Factor
pH p Factor
(setpoint – measured)
=
on
setpoint
Cl Set
Point
2.0
% Time
P
factor
0.1
0.5
1
5
10
50
0.1
100
0.1
76
P
factor
Cl
Measured
1.8
ON
1%
5%
10%
50%
100%
Very proportional and slow dosing
Very proportional and slow dosing
On/Off control
On/Off control