# A04 Pipe Spec

### Definition

Set the pipe outer diameter. Default values vary depending on the selected pipe unit.

<table><thead><tr><th width="105.4267578125"></th><th width="104.4892578125">DN8</th><th width="109.6748046875">DN10</th><th width="114.669921875">DN15</th><th width="109.3388671875">DN20</th><th>DN25</th></tr></thead><tbody><tr><td><p>Default</p><p>mm</p></td><td>12</td><td>18</td><td>22</td><td>26</td><td>32</td></tr><tr><td>inch</td><td>0.4724</td><td>0.7086</td><td>0.8861</td><td>1.0236</td><td>1.2598</td></tr><tr><td><p>Minimum</p><p>mm</p></td><td>9</td><td>15</td><td>15</td><td>18</td><td>24</td></tr><tr><td>inch</td><td>0.3543</td><td>0.5905</td><td>0.5905</td><td>0.7086</td><td>0.9448</td></tr><tr><td><p>Maximum</p><p>mm</p></td><td>15</td><td>22</td><td>30</td><td>35</td><td>43</td></tr><tr><td>inch</td><td>0.5905</td><td>0.8661</td><td>1.1811</td><td>1.3779</td><td>1.6929</td></tr></tbody></table>

{% hint style="info" %}

1. Millimeters (mm) are used as the base unit, while inches are provided as converted values (conversion reference: 1 inch = 25.4 mm).
2. If a value exceeds four decimal places, it will be truncated to four decimal places without rounding.
   {% endhint %}

### Notes

1. Pipe size units are determined by **B06 (Pipe Size Unit)**.
2. <mark style="color:red;">Each time the pipe size is changed, please re-execute</mark> <mark style="color:red;"></mark><mark style="color:red;">**Z03 Auto Initialize**</mark> <mark style="color:red;"></mark><mark style="color:red;">and</mark> <mark style="color:red;"></mark><mark style="color:red;">**Z04 Auto Zero Offset**</mark> <mark style="color:red;"></mark><mark style="color:red;">to improve measurement accuracy and ensure stable product performance.</mark>
3. On certain firmware versions, a pipe material confirmation page will appear after setting **A04 Pipe Wall Thickness**. Please select the matching pipe material or choose **Custom**. If a predefined pipe material is selected, **A08 (Pipe Material)** will be synchronized automatically.

### Operation Procedure

<details>

<summary><strong>Button Functions (Click to Expand)</strong></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="https://content.gitbook.com/content/i4ECt41Kyy9211OWazj4/blobs/BZuNjMgY75LH0onY5NtL/image" alt="" data-size="line"> **Blue Button -** Leftmost button: Return, exit, or save settings.

Gray Arrow Buttons:

* <img src="https://content.gitbook.com/content/i4ECt41Kyy9211OWazj4/blobs/Br88VpmnPLAPdutxVdZb/image" alt="" data-size="line"> **Left Gray Button:** Page up, increase value, or select item
* <img src="https://content.gitbook.com/content/i4ECt41Kyy9211OWazj4/blobs/3Dzp8nuxmHsaZ7LqBscw/image" alt="" data-size="line"> **Right Gray Button:** Page down, decrease value, or select item
* <img src="https://content.gitbook.com/content/i4ECt41Kyy9211OWazj4/blobs/sq6fX6r39JE0Au2hahAR/image" 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>

```
A04 Pipe Outer Diameter Setting Steps
• From the main screen(green backlight), 
  press Orange Button(Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select A. Measurement, press Orange Button(Enter).
• Use Gray Arrow Buttons to select A04 Pipe Outer Diameter, press Orange Button(Enter).
• Use Gray Arrow Buttons to choose the digit to adjust(highlighted in dark gray).
• Press Orange Button(Edit) to enter adjustment mode.
• Adjust digits: Left Gray Button to increase, Right Gray Button to decrease.
• Press Orange Button(Set) to confirm each digit; repeat for other digits as needed.
• After all digits are set, press Blue Button(Save).
• Confirm by pressing Orange Button(Save) (or Blue Button(NOT) to cancel).
• On certain versions, a “Pipe Material Confirmation” screen will be displayed.
• Use the gray arrow keys to select the matching pipe material or Custom, 
  then press the orange Set key to confirm.
• Press Blue Button(ESC) to return to the main screen(green backlight).
```

<figure><img src="https://3404778090-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fi4ECt41Kyy9211OWazj4%2Fuploads%2Fb8Mq7S4BlhD81zDcsn6I%2FFU-LT-A04-en.png?alt=media&#x26;token=efd29516-388d-40a8-acb9-37f5874d389f" alt="" width="375"><figcaption></figcaption></figure>

### A04 Options, RS485 Values, Read/Write Commands, and Formats

| Input Range of This Parameter | Corresponding Values     | RS-485 Value |
| ----------------------------- | ------------------------ | ------------ |
| Custom                        | Refer to the table above | -            |
| Minimum                       |                          | -            |
| Maximum                       |                          | -            |

> Refer to the [Read/Write Memory List](https://docs.lorric.com/qr/fu-lt-english-v1/communication/modbus-rtu-protocol/read-write-memory-ram) for the Modbus command format. This parameter uses the float 32 data format.