# A07 Pipe Inner Diameter

#### Definition

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

|   DN | Unit | Default | Minimum | Maximum |
| ---: | ---- | ------: | ------: | ------: |
|   DN | Unit | Default | Minimum | Maximum |
|  DN8 | mm   |     9.8 |       1 |      14 |
|  DN8 | inch |  0.3858 |  0.0393 |  0.5511 |
| DN10 | mm   |    13.4 |       7 |    20.6 |
| DN10 | inch |  0.5275 |  0.0275 |  0.8110 |
| DN15 | mm   |    16.6 |       5 |      29 |
| DN15 | inch |  0.6535 |  0.1968 |  1.1417 |
| DN20 | mm   |    20.6 |       7 |    33.4 |
| DN20 | inch |  0.8110 |  0.2755 |  1.3149 |
| DN25 | mm   |    25.6 |      12 |      41 |
| DN25 | inch |  1.0079 |  0.4724 |  1.6141 |

### 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 **A07 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</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>

```
A07 Pipe Inner 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 A07 Pipe Inner 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="/files/jtayFfcbj6vAYsVj4pxp" alt="" width="375"><figcaption></figcaption></figure>

## A07 Options, RS485 Values, Read/Write Commands, and Formats

| Refer to the table above | Refer to the table above | Refer to the table above |
| ------------------------ | ------------------------ | ------------------------ |
| Default                  | Refer to the table above | -                        |
| Minimum                  |                          | -                        |
| Maximum                  |                          | -                        |

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


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