A03 Pipe Geo Unit

Definition

This function sets the unit for the flow meter’s tube size. The default unit is mm.

Notes

1. After executing this function, the setting for B06 (Tube Size Unit) will be automatically updated.

2. Each time the pipeline size is changed, perform Z03 Auto Initialize and Z04 Auto Zero Offset to ensure accurate flow readings and maintain stable product quality.

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: Previous Page, decrease value, or select item

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

• Orange Button: 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.

A03 Pipe Geo Unit 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 A03 Pipe Geo Unit, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the options. 
• Press Orange Button (Set) to confirm.
• Press Blue Button (ESC) to return to the main screen (green backlight).

A03 Options, RS485 Values, Read/Write Commands, and Formats

Options	Description	RS-485 Value
mm (Custom)	mm	0
inch	inch	1

Refer to the Read/Write Memory List for the Modbus command format. This parameter uses the Int16 data format.

Pipe Size Reference Table (Outer Diameter / Inner Diameter / Wall Thickness / Circumference)

The allowable input ranges for parameters A04 to A07 vary depending on the unit setting of A03 and the device model. If values for A04 to A07 are entered first and the unit setting of A03 is changed afterward, the system will automatically perform unit conversion.

For example, if A04 (pipe outer diameter) is entered as 1.0 in inch mode and A03 is later switched to mm, the displayed value of A04 will be automatically converted to 25.4.

1. Since the inner diameter is calculated from the outer diameter and wall thickness (ID = OD − 2 × thickness), all four parameters are interdependent. If an entered value causes any parameter to exceed its allowable range, the system will not permit the value to be saved.

2. All system values are calculated using float32 precision. As a result, displayed or calculated values may include non-integer numbers.

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

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

A03 (mm): A04–A07 Input Ranges

FU-LT008 (mm)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	12	9	15
A05 Pipe Perimeter	37.6991	28.2743	47.1238
A06 Pipe thickness	1.1	0.5	4
A07 Pipe ID(Inner Diameter)	9.8	1	14

FU-LT010 (mm)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	18	15	22
A05 Pipe Perimeter	56.5486	47.1238	69.1150
A06 Pipe thickness	2.3	0.7	4
A07 Pipe ID(Inner Diameter)	13.4	7	20.6

FU-LT015 (mm)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	22	15	30
A05 Pipe Perimeter	69.1150	47.1238	94.2377
A06 Pipe thickness	2.7	0.5	5
A07 Pipe ID(Inner Diameter)	16.6	5	29

FU-LT020 (mm)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	26	18	35
A05 Pipe Perimeter	81.6814	56.5486	109.0557
A06 Pipe thickness	2.7	0.8	5.5
A07 Pipe ID(Inner Diameter)	20.6	7	33.4

FU-LT025 (mm)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	32	24	43
A05 Pipe Perimeter	100.5309	75.3982	135.0884
A06 Pipe thickness	3.2	1	6
A07 Pipe ID(Inner Diameter)	25.6	12	41

A03 (inch): A04–A07 Input Ranges

FU-LT008 (inch)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	0.4724	0.3543	0.5905
A05 Pipe Perimeter	1.4842	1.1131	1.8552
A06 Pipe thickness	0.0433	0.0196	0.1574
A07 Pipe ID(Inner Diameter)	0.3858	0.0393	0.5511

FU-LT010 (inch)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	0.7086	0.5905	0.8661
A05 Pipe Perimeter	2.2263	1.8552	2.7210
A06 Pipe thickness	0.0905	0.0275	0.1574
A07 Pipe ID(Inner Diameter)	0.5275	0.2755	0.8110

FU-LT015 (inch)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	0.8661	0.5905	1.1811
A05 Pipe Perimeter	2.7210	1.8552	3.7105
A06 Pipe thickness	0.1062	0.0196	0.1968
A07 Pipe ID(Inner Diameter)	0.6535	0.1968	1.1417

FU-LT020 (inch)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	1.0236	0.7086	1.3779
A05 Pipe Perimeter	3.2158	2.2263	4.3289
A06 Pipe thickness	0.1062	0.0314	0.2165
A07 Pipe ID(Inner Diameter)	0.8110	0.2755	1.3149

FU-LT025 (inch)

Parameter	Default	Minimum	Maximum
A04 Pipe OD(Outer Diameter)	1.2598	0.9448	1.6929
A05 Pipe Perimeter	3.9579	2.9684	5.3184
A06 Pipe thickness	0.1259	0.0393	0.2362
A07 Pipe ID(Inner Diameter)	1.0078	0.4724	1.6141