> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fp-as310-english-v5/parameters/a-measurement-setup/a01-pipe-type.md).

# A01 Pipe Type

### Definition

Sets which **T-connector (tee fitting)** the flow meter is installed on, so the unit applies the matching calibration data. The default is 1 inch.

The FP-AS310 main unit is the same for every pipe size, and each unit is calibrated at the factory together with its T-connector. If A01 does not match the T-connector on your pipe, the flow reading will be inaccurate.

<details>

<summary><strong>Check Your T-connector</strong> <em>(Click to Expand)</em></summary>

**1. Match the serial number**

Compare the serial number on the T-connector with the serial number of the main unit.

<figure><img src="https://content.gitbook.com/content/9OzHCbunq3LhLMF6nKp1/blobs/V3SQr4n2LAV8jJ66vs3j/FP-AS-t-connector-code.jpg" alt=""><figcaption></figcaption></figure>

* **If the serial numbers match** <mark style="color:$danger;">(marked in red box)</mark>**:** The A01 setting should generally correspond to the pipe size marked on the T-connector.
* **If the serial numbers do not match:** A01 **must still be adjusted** to match the size of the T-connector actually used, to ensure that the correct calibration curve is applied.

**2. Identify the material and size**

Choose the option that matches both the material and the size of your T-connector.

* **Plastic T-connector** (UPVC, PPH or PVDF): select the option named by size only, such as **2 inch**.
* **Metal T-connector** (stainless steel, 316L): select the option that ends in **SS**, and match both the size and the thread. For example, **3/4 PT F SS** is a 3/4 inch, female thread, stainless steel T-connector. In the name, **PT** means pipe thread, **M** means male thread, and **F** means female thread.

</details>

### Notes

* All FP-AS310 units are factory-calibrated as matched T-connector and main unit pairs. Using a mismatched combination may result in inaccurate flow measurement. The user assumes responsibility for measurement accuracy in this case.
* Whenever the T-connector is replaced or changed, update A01 to match the new T-connector.
* After A01 matches your T-connector, use [A02 Scale Factor](/qr/fp-as310-english-v5/parameters/a-measurement-setup/a02-scale-factor.md) to correct any small remaining deviation.

### 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="https://2754849036-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrlMqIBsRPDmLFSx4eE5q%2Fuploads%2FnraUxyr39xSIGFdDiwll%2Fimage?alt=media&amp;token=6b640f75-6a8f-4f67-b7f5-33cb91abebe5" alt="" data-size="line"> **Blue Button:** Leftmost button: Return, exit, or save settings.
* Gray Direction Buttons:
  * <img src="https://2754849036-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrlMqIBsRPDmLFSx4eE5q%2Fuploads%2FR4VqdS3hqxaK4QIvPhAG%2Fimage?alt=media&amp;token=635060a1-0ea4-411d-9121-8f99294201b9" alt="" data-size="line"> **Left Gray:** Previous Page, increase value, or select item
  * <img src="https://2754849036-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrlMqIBsRPDmLFSx4eE5q%2Fuploads%2FmS7ef3b3D0h68CG9BotQ%2Fimage?alt=media&amp;token=c3e56634-50ff-4f1a-863d-b4fe8ee64c3e" alt="" data-size="line"> **Right Gray:** Next Page, decrease value, or select item
* <img src="https://2754849036-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrlMqIBsRPDmLFSx4eE5q%2Fuploads%2FUVFgzkcG7mBRjA1WED7R%2Fbutton-orange.png?alt=media&amp;token=5b1bfda9-78d1-43de-8a99-15ac97c0104b" 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>

```
A01 Pipe Type Setting Steps
• From the main screen (green backlight), 
  press Orange Button (Setup) to enter settings (orange backlight).
• Select A. Measure by pressing Orange Button (Enter).
• Use Gray Arrow Buttons to select A01 Pipe Type, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the options. 
• Press Orange Button (Set) to confirm.
• Press Blue Button (ESC) to return to the main screen (green backlight).
```

<figure><img src="https://2754849036-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrlMqIBsRPDmLFSx4eE5q%2Fuploads%2FGh8zybnuZhSMvcCrZN8z%2FFP-AS310-A01-en.png?alt=media&#x26;token=410cc61f-7c7d-4cfc-90c5-6ecaab2b98eb" alt="" width="288"><figcaption></figcaption></figure>

### A01 Options, RS485 Values, Read/Write Commands, and Formats

| Options          | Description                                                                           | RS-485 Value |
| ---------------- | ------------------------------------------------------------------------------------- | ------------ |
| 1 inch (Default) | Plastic T-connector, DN 25 (Model FP-P025)                                            | 0            |
| 3/4 inch         | Plastic T-connector, DN 20 (Model FP-P020)                                            | 1            |
| 2 inch           | Plastic T-connector, DN 50 (Model FP-P050)                                            | 2            |
| Scale Mode       | <mark style="color:$warning;">\[VERIFY]</mark>                                        | 3            |
| 2-1/2 inch       | Plastic T-connector, DN 65 (Model FP-P065)                                            | 4            |
| 1-1/4 inch       | Plastic T-connector, DN 32 (Model FP-P032)                                            | 5            |
| 1-1/2 inch       | Plastic T-connector, DN 40 (Model FP-P040)                                            | 6            |
| 1 inch v2        | <mark style="color:$warning;">\[VERIFY]</mark>                                        | 7            |
| 1/2 inch         | Plastic T-connector, DN 15 (Model FP-P015)                                            | 8            |
| 1 PT M SS        | Metal (stainless steel) T-connector, 1 inch, male thread (DN 25, Model FP-P025)       | 9            |
| 3/4 PT F SS      | Metal (stainless steel) T-connector, 3/4 inch, female thread (DN 20, Model FP-P020)   | 10           |
| 1-1/2 PT F SS    | Metal (stainless steel) T-connector, 1-1/2 inch, female thread (DN 40, Model FP-P040) | 11           |
| 2 PT F SS        | Metal (stainless steel) T-connector, 2 inch, female thread (DN 50, Model FP-P050)     | 12           |


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