A04 Pipe Outer Diameter

Definition

Set the pipe outer diameter. Default values vary depending on the selected pipe unit.

Pipe OD	DN15	DN20	DN25	DN32
Default mm	22	26	32	38
inch	0.866	1.024	1.260	1.496
Minimum mm	15	18	24	30
inch	0.591	0.709	0.945	1.181
Maximum mm	30	35	43	53
inch	1.181	1.378	1.693	2.087

Pipe OD	DN40	DN50	DN65	DN75
Default mm	48	60	76	89
inch	1.890	2.362	2.992	3.504
Minimum mm	36	46	58	70
inch	1.417	1.811	2.283	2.756
Maximum mm	65	78	92	120
inch	2.559	3.071	3.622	4.724

1. Millimeters (mm) are used as the base unit, while inches are provided as converted values (conversion reference: 1 inch = 25.4 mm).

2. If a value exceeds four decimal places, it will be truncated to four decimal places without rounding.

Notes

1. Pipe size units are determined by B06 (Pipe Size Unit).

2. Each time the pipe size is changed, please re-execute Z03 Auto Initialize and Z04 Auto Zero Offset to improve measurement accuracy and ensure stable product performance.

3. On certain firmware versions, a pipe material confirmation page will appear after setting A04 Pipe Wall Thickness. Please select the matching pipe material or choose Custom. If a predefined pipe material is selected, A08 (Pipe Material) will be synchronized automatically.

Operation Procedure

Button Functions (Click to Expand)

When the main screen is displayed in green backlight, the four buttons function as follows:

• Blue Button (leftmost): Return, exit, or save settings.

• Gray Direction Buttons:

  • Left Gray: Previous Page, decrease value, or select item

  • Right Gray: Next Page, increase value, or select item

• Orange Button (rightmost): Rightmost button: Enter settings, edit, or confirm selection

Do not hold buttons for extended periods to avoid damage.

Button functions may change depending on the operation context to improve usability or prevent accidental presses.

A04 Pipe Outer Diameter 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 A04 Pipe Outer Diameter, 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).
• On certain versions, a “Pipe Material Confirmation” screen will be displayed.
• Use the gray arrow keys to select the matching pipe material or Custom, 
  then press the orange Set key to confirm.
• Press Blue Button(ESC) to return to the main screen(green backlight).

A04 Options, RS485 Values, Read/Write Commands, and Formats

Input Range of This Parameter	Corresponding Values	RS-485 Value
Custom	Refer to the table above	-
Minimum		-
Maximum		-

Refer to the Read/Write Memory List for the Modbus command format. This parameter uses the float 32 data format