# Z05 Scale Factor
### Definition
This function calibrates the flow meter’s accuracy. If the displayed flow differs systematically from a reference value, the user can set a scale factor to automatically correct the output.
**Usage:**
* The measured flow is multiplied by a fixed factor KKK.
* Range: **+0.001 to +1000**, default **+1.0**.
* Execution automatically updates **K03 (Scale Factor)**.
**Example:**
Final Flow=Measured Flow×K\text{Final Flow} = \text{Measured Flow} \times KFinal Flow=Measured Flow×K
If actual flow = 101.5 L but meter shows 100 L, set K=1.015K = 1.015K=1.015.
{% hint style="info" %}
Z-series parameters currently **do not support Modbus read/write**.
{% endhint %}
### Notes
1. Z05 cannot accept negative values.
2. To measure reverse flow, enable **A17 (Reverse Flow)**.
3. **K03** serves the same function as Z05; users may choose either.
4. (Z-series parameters are for quick setup, consolidating multiple essential settings to simplify installation.)
### Operation Procedure
Button Functions (Click to Expand)
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:
* **Blue Button -** Leftmost button: Return, exit, or save settings.
Gray Arrow Buttons:
* **Left Gray Button:** Page up, increase value, or select item
* **Right Gray Button:** Page down, decrease value, or select item
* **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 %}
```
Z05 Scale Factor Setting Steps
• From the main screen(green backlight),
press Orange Button(Setup) to enter settings (orange backlight).
• Use Gray Arrow Buttons to select Z. Easy Setup , press Orange Button(Enter).
• Use Gray Arrow Buttons to select Z05 Scale Factor, 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).
```
