Setpoint
delta
pH
time
Proportional dosing
Relay on
Relay off
pH Control:On/Off
Dosing Type:Acid
Period :003 sec
Setpoint :07.00 pH
Delta :0.1
Hysteresis:1.00 pH
ANALOG OUTPUT
The type of analog output could be set as described in “Analog output” chapter. The analog output
span for pH could be set in “pH Menu” - “Analog Output pH”.
“Min. Rec” will set the recorder low limit and “Max. Rec” will set the recorder high limit. The Max.
Rec. value must be greater than Min. Rec. value.
The output will be proportional with pH value if the read value is between those limits.
The analog output limits could be quickly consulted in one of the pH measuring panel.
pH DOSING
The PCA320 and PCA340 can use ON/OFF or proportional dosing algorithm to stabilize the pH .
The analyzer has a relay for acid or alkali dosing and also the 4-20 mA output could be configured
as a dosing output.
To select the type of pH dosing edit the “pH Menu” - “Dosing Control pH” - “pH Control” line. The
available options are Proportional and ON/OFF.
The acid or alkali dosing is set in the “pH Menu” - “Dosing Control pH” - “Dosing Type”. When “Acid”
is selected, the analyzer will dose when the pH value is higher than the setpoint and when “Alk” is
selected, the analyzer will dose when the pH value is lower than the setpoint.
Proportional dosing
The proportional dosing algorithm turns on the dosing relay proportionally with the difference between
the setpoint and measured value.
pH SETTINGS (PCA320, PCA330, PCA340)
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