23
SETUP
Note:
To enter Set point screen, pump control mode must be set as Auto.
Hysteresis / Proportional Band
Hysteresis (On/Off Control only)
On/Off control action turns the dosing On or Off based on a previously assigned set point. The pump
status (running or not running) changes depending on pH changes. To prevent oscillation, a pH band,
called hysteresis, is created between the on and off operations.
The pump starts dosing when the measurement crosses the set point value. The pump stops dosing
when the measurement crosses the set point value ± hysteresis band.
In order to set the hysteresis value, automatic control must be enabled, with On/Off control type On.
Proportion band (Proportional Control only)
The proportional band is a control variable and is defined as the amount of change in input, required
to cause the control output to go through 100% of operating range.
In order to set the proportional band value, automatic control must be enabled, with Proportional
control type on. The pump is continuously on at the set point value with added band.
Option:
user selectable
Press the arrow keys to set the value.
“HYSTERESIS” or “PROPORTIONAL BAND” message is scrolled on the bottom of the LCD screen.
Note:
To enter Hysteresis / Band screen, pump control mode must be set as Auto.
Startup Delay (Automatic Control Only)
Option:
user selectable (0 to 600s)
Startup delay represents the delay to start dosing at power-on.
Press the arrow keys to change the time values.
“STARTUP DELAY SEC” message is scrolled on the bottom of the LCD screen.
Note:
To enter Startup Delay screen, pump control mode must be set as Auto.