# A12 Liquid Soundspeed

### Definition

Set the liquid Soundspeed. Default: custom.

{% hint style="info" %}
The sound speed of a fluid varies with temperature. Please refer to the [**Liquid Temperature vs. Sound Speed Reference Table**](https://www.lorric.com/en/Articles/Industrial-database/all/sound-speeds-data-liquid).
{% endhint %}

### Definition

1. When the user sets **A10 (Fluid Type)**, **A12 (Fluid Sound Speed)** will be updated accordingly based on the A10 selection.
2. The unit of **A12** is determined by **B04 (Flow and Sound Speed Unit)**.

### 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>

```
A12 Liquid Soundspeed 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 A12 Liquid Soundspeed, 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).
• 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%2F87bB7m5JIgz33q1pJcF8%2FFU-LT-A12-en.png?alt=media&#x26;token=81910516-48a4-4585-9dd4-68bc445a4d1a" alt="" width="375"><figcaption></figcaption></figure>

### A12 Options, RS485 Values, Read/Write Commands, and Formats

| Input Range of This Parameter | Corresponding Values | RS-485 Value |
| ----------------------------- | -------------------- | ------------ |
| Default                       | 1482                 | -            |
| Minimum                       | 100                  | -            |
| Maximum                       | 3000                 | -            |

> 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.