A22 Auto Zero Offset

Definition

Recalibrates the flowmeter zero point, resetting the output to zero. Recommended for ultra-low flow measurement to correct zero-flow offset errors and improve measurement accuracy.

Starts only after pressing Start and automatically updates the Z04 (Auto Zero Flow) settings.

It is recommended to perform Z04 when measuring ultra-low flow (below 10% of the maximum range), as small zero-point offsets can cause significant errors at low flow.

Example: With a zero-point offset of 0.2 L/min:

• At an actual flow of 100 L/min, the error is approximately 0.2%.

• At an actual flow of 0.5 L/min, the error can reach nearly 40%.

Currently, A22 does not support Modbus read/write command operation.

Notes

1. Perform A22 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.

2. Repeat this procedure after every reinstallation or when changing pipe size or material.

3. The A22 function is equivalent to Z04; 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)

When the main screen is displayed in green backlight, the four buttons function as follows:

• Blue Button (leftmost): Return, exit, or save settings.

• Gray Direction Buttons:

  • Left Gray: Previous Page, decrease value, or select item

  • Right Gray: Next Page, increase value, or select item

• Orange Button (rightmost): 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.

A22 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 Zero Offset” when automatic zero-flow begins.
• After ~30 seconds, it displays “Set zero offset to ____”.
• Then it returns to Z04 Auto Zero Flow, indicating completion.