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OPERATIONAL GUIDE
Control Mode
The Control Mode is the normal operational mode during which the controller:
• Measures the HI1036-18XX probes signal, converts it to a measurement unit (pH temperature corrected), and displays the
measurements on the display along with temperature.
• Provides proportional feed with an adjustable band for acid and chlorine additions.
• Controls the alarm relays and analog outputs (BL121, BL123), as per setup configuration.
• Sends data to Hanna Cloud (BL122, BL123).
• Displays active events on the LCD.
• Activates the LEDs for quick visual feedback.
• Ensures the pH-ORP control interlock (the ORP control is running only when the pH set point is reached).
• Automatically logs pH / ORP /temperature measurements, last calibration data, setup configuration, event data.
• Allows access to logged data in view mode / export operation / PLOT.
In control mode, the dosing pumps are regulated by using the proportional feed. Proportional feed regulates pump On / Off
time within the band. The pump remains On continuously at the set point with band added. As the set point is approached,
the pump on less.
In control mode, the Overtime safety timer will run during the On pump period and is reset when the set point is reached.
pH control ORP control
Dosing Type ACID/BASE
Set Point 6.00 – 8.00 pH 200– 900 mV
Proportional band 0.1– 2.0 pH 10– 200 mV
The plot shows how the dosing time is affected by this difference.
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