C04 Dosing Target

Definition

Sets the totalizer to automatically reset when it reaches a specified value (unit: L). Range: 0.1–999,999,999. Default: 1000.

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. C04 accepts positive values only.

2. To use the C04 function, also configure C03, C05, E02, and H09 accordingly.

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.

C04 Dosing Target 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 C04 Dosing Target, press Orange Button(Enter).
• Use Gray Arrow Buttons to choose the digit to adjust(highlighted in dark gray).
• Press Orange Button(Edit) to enter adjustment mode.
• Adjust digits: Left Gray Button to increase, Right Gray Button to decrease.
• Press Orange Button(Set) to confirm each digit; repeat for other digits as needed.
• After all digits are set, press Blue Button(Save).
• Confirm by pressing Orange Button(Save) (or Blue Button(NOT) to cancel).
• Press Blue Button(ESC) to return to the main screen(green backlight).

Main Screen 4 – Dosing

The dosing status can be monitored on the main screen. The first line of the LCD shows the C05 Reset Time, and the second line shows the C04 Dosing Target.

• If C03 is set to Forward, the totalizer increases from zero. When it reaches the C04 target, it automatically resets to zero and starts a new cycle.

• If C03 is set to Reverse, the totalizer counts down from the C04 target. When it reaches zero, it automatically resets to the C04 target and begins a new countdown cycle.

C04 Options, RS485 Values, Read/Write Commands, and Formats

Parameter Input Range	Corresponding Values	RS-485 Value
Default	1000	-
Minimum	0.1	-
Maximum	999,999,999	-

Refer to the Read/Write Memory List for the Modbus command format. This parameter uses the float 32 data format.