# A12 Liquid Soundspeed

### Definition

Set the liquid Soundspeed. Default: 1482.

{% 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</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>

```
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="/files/7rfnIxWN7FCdncKQoThp" 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](/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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