This function recalibrates the flow meter zero point (0 flow) by resetting the output to zero.
For ultra-low flow measurements, zero calibration helps correct zero-offset errors and improves accuracy.
The function starts after pressing Start and automatically updates A22 (Auto Zero Offset) upon completion.
Recommendation
It is strongly recommended to execute Z04 when measuring flow rates below 10% of full scale, as small zero offsets can cause significant errors at low flow.
Example
Zero offset: 0.2 L/min
Actual flow 100 L/min → error ≈ 0.2%
Actual flow 0.5 L/min → error ≈ 40%
Parameter Z is not supported for Modbus read/write operations in the current version.
Notes
Perform Z04 when the pipeline is fully filled with liquid and the liquid is completely stationary. Performing Z04 when the pipe is not full may cause flow measurement errors and unstable readings; if this occurs, repeat Z04 under full-pipe conditions.
Repeat this procedure after every reinstallation or when changing pipe size or material.
The Z04 function is equivalent to A22; users can choose either.
(Z-series parameters are designed for quick setup, consolidating multiple essential settings to streamline installation.)
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.
Z04 Automatic Zero Offset Setting Steps
• From the main screen (green backlight),
press Orange Button (Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select Z. Easy Setup , press Orange Button (Enter).
• Use Gray Arrow Buttons to start Automatic Zero Offset
• Device shows “Start auto Z04” when automatic zero-flow begins.
• After ~30 seconds, it displays “Set zero offset to ____”.
• Then it returns to Z04 Auto Zero Offset, indicating completion.
Blue Button - Leftmost button: Return, exit, or save settings.
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
