# A21 Auto Initialize

### Definition

Auto-detect fluid ultrasonic velocity to complete environmental parameter setup after mechanical installation, electrical installaton and parameter configuration.

The function starts only after pressing **Start**. Upon execution, it will automatically update the **Z03 (Auto Initialization)** settings.

{% hint style="info" %}
Currently, **A21** does not support Modbus read/write command operation.
{% endhint %}

### Notes

1. This step <mark style="color:red;">**must be performed when the pipeline is fully filled with liquid**</mark>. If **A21** is executed when the pipeline is not full, it may cause flow measurement errors and fluctuating readings. If this occurs, repeat **A21** under fully filled conditions.
2. The **Auto Initialization** of **A21** must be performed with the pipeline full. Whether the fluid is **flowing or stationary** does not affect the result.
3. <mark style="color:red;">**Each time the system is reinstalled or the pipeline size/material is changed, this function should be executed again.**</mark>
4. The **A21** function is equivalent to **Z03**, and the user may choose to execute either one.\
   \&#xNAN;*(Z-series parameters are designed for quick setup, mainly during installation, consolidating multiple necessary parameters into a single series for faster completion.)*

### Operation Procedure

<details>

<summary><strong>Button Functions</strong> <em>(Click to Expand)</em></summary>

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:

* <img src="/files/bdd75120acea6361d128fd3deec06f1a8277e667" alt="" data-size="line"> **Blue Button -** Leftmost button: Return, exit, or save settings.

Gray Arrow Buttons:

* <img src="/files/2e37e572251371c6020ab6d9e11c1fcdd5ef0369" alt="" data-size="line"> **Left Gray Button:** Previous Page, decrease value, or select item
* <img src="/files/50a67ff5744401e217d5b9e838da3f7909be732f" alt="" data-size="line"> **Right Gray Button:** Next Page, increase value, or select item
* <img src="/files/6c0b22a2048cf9b2afd86fac7a65e414feb967d4" alt="" data-size="line"> **Orange Button:** 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 %}

</details>

```
A21 Auto Initialize Setting Steps
• From the main screen (green backlight), 
press Orange Button (Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select A. Measure , press Orange Button (Enter).
• Use Gray Arrow Buttons to select A21 Auto Initialize, press Orange Button (Enter).
• Use Right Gray Arrow Buttons to Start. 
• Press Blue Button (ESC) to return to the main screen (green backlight).
```

<figure><img src="/files/GmQ6H3qxaC0zihZJ6UJb" alt="" width="375"><figcaption></figcaption></figure>


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