# D16 Dosing Alarm

### Definition

Set the flow meter’s alarm mode when the totalizer reaches the preset target (C04). Default: Do Not Disturb.

<details>

<summary><strong>Dosing Function (Click to Expand)</strong></summary>

#### 1. Flow Meter Dosing Function Description

The dosing function controls a valve based on the flow meter’s totalizer. When the accumulated volume reaches the preset target, the valve closes automatically. After the set buffer time, the totalizer resets to zero, preparing for the next dosing cycle.

This function enables dosing control directly through the flow meter without an external PLC, making it suitable for chemical dosing, liquid replenishment, and batching applications.

#### **2. Parameter Configuration Table**

| Parameter Code | Function          | Description                                                   | Recommended Setting                             |
| -------------- | ----------------- | ------------------------------------------------------------- | ----------------------------------------------- |
| E02            | OCT Definition    | Sets the control output mode                                  | Must be set to **Dosing mode**                  |
| C03            | Dosing Mode       | Enables the dosing function                                   | Set to **On**                                   |
| C04            | Dosing Target     | Sets the target volume per dosing cycle                       | Enter as required (unit: L)                     |
| C05            | Dosing Reset Time | Sets the buffer time after the target is reached before reset | Set based on system response time (unit: s)     |
| H09            | Startup Screen    | Sets the main display screen                                  | Set to **Dosing mode screen**                   |
| D16            | Dosing Alarm      | Alarm indication when dosing is completed                     | Enable as required or set to **Do Not Disturb** |

#### 3. Dosing Operation

After the valve opens, fluid flow begins and the flow meter accumulates volume in real time. When the accumulated volume reaches the dosing target set in **C04**, the system closes the valve according to the **OCT output logic defined in E02**, completing the dosing cycle. A “Dosing Complete” alarm is then triggered based on the **D16** setting.

The system then enters the reset delay defined in **C05**. Once the delay time elapses, the totalizer is automatically reset to zero and the system is ready for the next dosing cycle.

<figure><img src="https://3404778090-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fi4ECt41Kyy9211OWazj4%2Fuploads%2F2V2oSIU7GFQjQQG3n0Mx%2FDosing.png?alt=media&#x26;token=5a25aa73-62e6-4743-91c2-0fb43fb72e58" alt="" width="563"><figcaption></figcaption></figure>

{% hint style="info" %}
Due to response time delays in valve actuation and control signals, the actual dosing result may differ slightly from the set value. This deviation becomes more noticeable with smaller dosing volumes, higher flow rates, or longer distances between the valve, flow meter, and container.

For higher dosing accuracy, select an appropriate pipe size and piping layout. It is recommended to perform on-site testing and adjust the calibration (scaling) factor as needed before actual operation.
{% endhint %}

</details>

### Notes

{% hint style="info" %}

#### **DND (Do Not Disturb) Mode**

* System detects abnormalities, but **red backlight remains off**.
* Example: **Alarm-A “4 Off Pipe”** triggers no backlight.
* Abnormalities still appear on the **Abnormalities page**.
* **RS485** connection still sends alarm signals.
* **OCT output** continues to signal alarms if configured.
  {% endhint %}

### 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>

```
D16 Dosing Alarm Setting Steps
• From the main screen (green backlight), 
press Orange Button (Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select D. Alarm & Info, press Orange Button (Enter).
• Use Gray Arrow Buttons to select D16 Dosing Alarm, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the options. 
• Press Orange Button (Set) to confirm.
• Press Blue Button (ESC) to return t
```

<figure><img src="https://3404778090-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fi4ECt41Kyy9211OWazj4%2Fuploads%2FfkeJcloH2fJgfpFKJChA%2FFU-LT-D16-en.png?alt=media&#x26;token=9d067287-a654-4c0e-9e35-cf8b81a9cf12" alt="" width="375"><figcaption></figcaption></figure>

### D16 Options, RS485 Values, Read/Write Commands, and Formats

| Options                  | Description | RS-485 Value |
| ------------------------ | ----------- | ------------ |
| Off                      | -           | 0            |
| On                       | -           | 1            |
| Do Not Disturb (Default) |             | 2            |

> 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 Int16 data format.