# Z03 Auto Initialize
### **Definition**
This function automatically detects the ultrasonic velocity of the fluid under test, assisting the flow meter in completing the environmental parameter setup. It is intended to be used after the flow meter’s [**mechanical installation**](https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/installation-and-setup/mechanical-installation), [**electrical installation**](https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/installation-and-setup/electronic-installation), and [**parameter settings**](https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/installation-and-setup/parameter-setup).
The function begins execution only after pressing **Start**. Once executed, it automatically updates **A21 (Auto Start-Up Initialization)**.
{% hint style="info" %}
The Z-series parameter cannot be accessed via Modbus read/write commands in the current version.
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### Notes
1. This procedure must be performed with the **pipeline fully filled with liquid**. Executing Z03 when the pipe is not full may cause flow measurement errors and unstable readings. If this occurs, repeat Z03 under full-pipe conditions.
2. Z03 automatic on-site initialization must always be performed when the pipe is full. The liquid may be either stationary or flowing; this does not affect the result.
3. Each time the flow meter is reinstalled or the pipe size or material is changed, this function should be executed again.
4. The A21 function performs the same operation as Z03; users may choose to execute either one.
5. (Z-series parameters are designed for quick setup, primarily to consolidate multiple essential parameters into a single series for faster 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
{% hint style="danger" %}
**Do not hold buttons for extended periods to avoid damage.**
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{% hint style="info" %}
Button functions may change depending on the operation context to improve usability or prevent accidental presses.
{% endhint %}
```
Z03 Auto Initialization 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 Z03 Auto Initialization, press Orange Button (Enter).
• Press Right Gray Button (Set) to start Auto Initialization.
• Press Blue Button (ESC) to return to the main screen (green backlight).
```
**Orange Button (rightmost):** Rightmost button: Enter settings, edit, or confirm selection
{% hint style="danger" %}
**Do not hold buttons for extended periods to avoid damage.**
{% endhint %}
{% hint style="info" %}
Button functions may change depending on the operation context to improve usability or prevent accidental presses.
{% endhint %}
