# C05 Dosing Reset Time

### Definition

Set the totalizer to reset automatically at a specified interval. Range: 1–3600 seconds. Default: 300.

<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

To use the **C05** function, also configure **C03**, **C04**, **E02**, and **H09** accordingly.

### 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>

```
C05 Dosing Reset Setting Steps
• From the main screen(green backlight), 
  press Orange Button(Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select C. Total, press Orange Button(Enter).
• Use Gray Arrow Buttons to select C05 Dosing Reset 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%2FKk1m33xYlSm0HaTWrMsL%2FFU-LT-C05-en.png?alt=media&#x26;token=1b9717ce-7b54-4140-a618-102db8b7c2e8" alt="" width="375"><figcaption></figcaption></figure>

#### Main Screen 4 – Dosing

The dosing status can be monitored on the main screen. The first line of the LCD shows the **C05 Reset Time**, which counts down from the user-set **C05** value. When it reaches zero, the totalizer automatically restarts the accumulation.

<figure><img src="https://3404778090-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fi4ECt41Kyy9211OWazj4%2Fuploads%2F1zUWpFiwjh9y71EA9ai8%2FFU-LT-Homepage-en-Dosing.jpg?alt=media&#x26;token=80a0e63e-8ee7-412a-8ee7-17b6561188bf" alt="" width="563"><figcaption></figcaption></figure>

### C05 Options, RS485 Values, Read/Write Commands, and Formats

| Parameter Input Range | Corresponding Values | RS-485 Value |
| --------------------- | -------------------- | ------------ |
| Default               | 300                  | -            |
| Minimum               | 1                    | -            |
| Maximum               | 3600                 | -            |

> 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.