C03 Dosing Mode

Definition

Set the totalizer counting direction—whether it counts upward or downward from the set value. Default: disabled.

Dosing Function (Click to Expand)

1. Flow Meter Dosing Function Description

The dosing function controls a valve based on the flow meter’s totalizer. When the accumulated volume reaches the preset target, the valve closes automatically. After the set buffer time, the totalizer resets to zero, preparing for the next dosing cycle.

This function enables dosing control directly through the flow meter without an external PLC, making it suitable for chemical dosing, liquid replenishment, and batching applications.

2. Parameter Configuration Table

Parameter Code	Function	Description	Recommended Setting
E02	OCT Definition	Sets the control output mode	Must be set to Dosing mode
C03	Dosing Mode	Enables the dosing function	Set to On
C04	Dosing Target	Sets the target volume per dosing cycle	Enter as required (unit: L)
C05	Dosing Reset Time	Sets the buffer time after the target is reached before reset	Set based on system response time (unit: s)
H09	Startup Screen	Sets the main display screen	Set to Dosing mode screen
D16	Dosing Alarm	Alarm indication when dosing is completed	Enable as required or set to Do Not Disturb

3. Dosing Operation

After the valve opens, fluid flow begins and the flow meter accumulates volume in real time. When the accumulated volume reaches the dosing target set in C04, the system closes the valve according to the OCT output logic defined in E02, completing the dosing cycle. A “Dosing Complete” alarm is then triggered based on the D16 setting.

The system then enters the reset delay defined in C05. Once the delay time elapses, the totalizer is automatically reset to zero and the system is ready for the next dosing cycle.

Due to response time delays in valve actuation and control signals, the actual dosing result may differ slightly from the set value. This deviation becomes more noticeable with smaller dosing volumes, higher flow rates, or longer distances between the valve, flow meter, and container.

For higher dosing accuracy, select an appropriate pipe size and piping layout. It is recommended to perform on-site testing and adjust the calibration (scaling) factor as needed before actual operation.

Notes

1. After enabling C03, also configure C04, C05, E02, and H09 accordingly.

2. If the control valve’s drive current is compatible, the flow meter’s built-in dosing function can be used directly with the valve to achieve the required dosing operation, without additional PLC programming.

Operation Procedure

Button Functions (Click to Expand)

The main unit has four buttons. The bottom line (Line 3) of the LCD displays the current function of each button. Under normal operation, the button functions are as follows:

• Blue Button - Leftmost button: Return, exit, or save settings.

Gray Arrow Buttons:

• Left Gray Button: Page up, increase value, or select item

• Right Gray Button: Page down, decrease value, or select item

• Orange Button: Rightmost button: Enter settings, edit, or confirm selection

Do not hold buttons for extended periods to avoid damage.

Button functions may change depending on the operation context to improve usability or prevent accidental presses.

C03 Dosing Mode Setting Steps
• From the main screen (green backlight), 
press Orange Button (Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select C. Total , press Orange Button (Enter).
• Use Gray Arrow Buttons to select C03 Dosing Mode, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the options. 
• Press Orange Button (Set) to confirm.
• Press Blue Button (ESC) to return to the main screen (green backlight).

Dosing Operation Mode Screen

C03 Options, RS485 Values, Read/Write Commands, and Formats

Options	Description	RS-485 Value
OFF (Default)	-	0
Count Up	-	1
Count Down	-	2

Refer to the Read/Write Memory List for the Modbus command format. This parameter uses the Int16 data format.