Z04 Auto Zero Offset

Definition

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

1. This step must be performed when the pipe is completely full and the liquid is fully stationary. Running Z04 under non-full or moving-liquid conditions may cause flow detection errors and unstable readings. If this occurs, repeat Z04 under full-pipe conditions.

2. Re-execute this function whenever the device is reinstalled, or when the pipe size or material changes and the flow reading is below 10% of the maximum range.

3. A22 has the same function as Z04; users may run either one.

   (Z-series parameters are for quick setup during installation, combining multiple required settings for faster configuration.)

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.

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 select  Z04. Auto Zero Offset , press Orange Button (Enter).
• Press Right Gray Button to start Auto 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.