11
Configuration
of the EC reading, even with highly variable flow rates.
PEC=0 PI control.
PIQ control disabled.
PEC= 0.01 - 2%
Dosing will be proportional to the water flow at the % rate entered and with adjustment to
setpoint through a PI algorithm.
- PIQ (PpH):
The PIQ control mode to adjust pH is a PI algorithm conditioned on the flow rate of water to be treated.
Initial dosing proportional to the water rate is set using the PpH parameter, and is subsequently corrected
by means of a PI approximation curve. This system, which can only be activated with independent pumps
(type mA outlets for acid/alkaline dosing), ensures pH stability even with highly variable flow rates and
provides greater agility in reaching and maintaining the
setpoint.
PpH=0 PI control. PIQ control disabled.
PpH= 1 - 200 Acid dosing will be proportional to the water flow rate with setpoint adjustment by means
of a PI algorithm. The proportion is indicated by the PpH parameter and is referenced to 100,000 units of
water flow.
Example: For a flow rate of 200,000 l/h of water and a PpH = 1, proportional dosing of acid will be: (1 /
100,000) x 200,000 l/h = 2 l/h
The proportion needed to achieve a specific pH will depend not only on its nature and concentration, but
also on the nature of the water to be treated and the rest of the dosed products that can influence this
parameter. The range PpH recommended to rapidly reach a pH and maintain it stable are detailed below.
The following tables for different acids are an approximation to the PpH value for these acids, depending
on the pH correction required (1 or 2 points of pH).
- Kp:
Proportional constant for PI adjustment. This parameter enables adjustment of the amount of device
response based on the difference between the reading and the setpoint (Error). The default value
is normally correct for the majority of in-line controls. A value that is too high will produce reading
oscillations around the setpoint value. A value that is too low will produce a slow approach to the setpoint.
A
1 point 2 points
60%
4-10
10-20
40%
8-15
15-30
10%
30-60
60-120
5%
60-110
120-200
A
1 point 2 points
80%
3-8
8-15
50%
6-15
15-25
10%
30-60
60-120
5%
60-110 120-200
A
1 point 2 points
90%
1-13
2-5
50%
2-5
4-10
10%
10-25
20-50
5%
20-50
40-100
Table for nitric acid
Note: Column "A" corresponds to the acid concentration
Table for phosphoric acid
Table for sulphuric acid
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