# A05 Pipe Perimeter

### Definition

Set the pipe circumference. Default values vary depending on the selected pipe unit.

<table><thead><tr><th width="112.4384765625"></th><th width="112.4287109375">DN8</th><th width="118.8154296875">DN10</th><th width="119.3720703125">DN15</th><th width="114.6416015625">DN20</th><th>DN25</th></tr></thead><tbody><tr><td><p>Default</p><p>mm</p></td><td>37.6991</td><td>56.5486</td><td>69.1150</td><td>81.6814</td><td>100.5309</td></tr><tr><td>inch</td><td>1.4842</td><td>2.2263</td><td>2.7210</td><td>3.2158</td><td>3.9579</td></tr><tr><td><p>Minimum</p><p>mm</p></td><td>28.2743</td><td>47.1238</td><td>47.1238</td><td>56.5486</td><td>75.3982</td></tr><tr><td>inch</td><td>1.1131</td><td>1.8552</td><td>1.8552</td><td>2.2263</td><td>2.9684</td></tr><tr><td><p>Maximum</p><p>mm</p></td><td>47.1238</td><td>69.1150</td><td>94.2377</td><td>109.0557</td><td>135.0884</td></tr><tr><td>inch</td><td>1.8552</td><td>2.7210</td><td>3.7105</td><td>4.3289</td><td>5.3184</td></tr></tbody></table>

### 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 **A05 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>

```
A05 Pipe Perimeter 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 A05 Pipe Perimeter , 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%2Fwa8XHMVoVzjBYQdmGwhD%2FFU-LT-A05-en.png?alt=media&#x26;token=fcc8ba7e-9a8c-4670-829a-2ef82db54a2e" alt="" width="375"><figcaption></figcaption></figure>

## A05 Options, RS485 Values, Read/Write Commands, and Formats

| Input Range of This Parameter | Corresponding Values     | RS-485 Value |
| ----------------------------- | ------------------------ | ------------ |
| Default                       | 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.