D05 FlowLIM Alarm

Definition

Set the flow meter’s alarm mode for flow exceeding the instantaneous flow range. Default: Off. The alarm code belongs to Alarm – B.

(D05 , D06 , D07 , and D08 work together to enable the flow range over-limit alarm function.)

Flow Range Limit Alarm Example (Click to Expand)

D06 Upper Limit: 30 LPM
D07 Lower Limit: 10 LPM
D08 Hysteresis: 3% (default)

Calculations:
Range: 30 − 10 = 20 LPM
Hysteresis: 20 × 3% = 0.6 LPM

Alarm Behavior:
When flow exceeds the upper limit (30 LPM), the alarm is triggered.
The alarm will clear only when the flow drops below 29.4 LPM (30 − 0.6).
When flow falls below the lower limit (10 LPM), the alarm is triggered.
The alarm will clear only when the flow rises above 10.6 LPM (10 + 0.6).

Notes

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.

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.

Flow Range Over-Limit Alarm Operation (Click to Expand)

When the flow range alarm is enabled and the flow reaches the alarm condition, Alarm B is triggered. Alarm bits (Bit0, Bit1) display 1 to indicate the alarm has been activated.

The system responds according to the alarm mode set in D05:

• On: The receiving device receives the alarm signal, and the flow meter screen displays a red backlight warning.

• Do Not Disturb (DND): The receiving device still receives the alarm signal, but the screen does not display the red backlight.

1

Set D05 to enable the flow range over-limit alarm

D05 FlowLIM 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 D05 FlowLIM 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 to the main screen (green backlight).

2

Set D06 to define the flow upper limit

D06 Up LIM 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 D06 Up LIM, 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).

3

Set D07 to define the flow lower limit

D07 Low LIM 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 D07 Low LIM, 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).

4

Set D08 to define the flow hysteresis

D08 Hysteresis 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 D08 Hysteresis, press Orange Button (Enter).
• Use the Gray Arrow Buttons to adjust the flow hysteresis percentage:
• Press the Left Gray Buttons to increase the value
• Press the Right Gray Buttons to decrease the value
• Press Orange Button (Set) to confirm.
• Press Blue Button (ESC) to return to the main screen (green backlight).

5

Flow Range Over-Limit Alarm Operation

When the flow range alarm is enabled and the flow reaches the alarm condition, Alarm B is triggered. Alarm bits (Bit0, Bit1) display 1 to indicate the alarm has been activated.

The system responds according to the alarm mode set in D05:

• On: The receiving device receives the alarm signal, and the flow meter screen displays a red backlight warning.

• Do Not Disturb (DND): The receiving device still receives the alarm signal, but the screen does not display the red backlight.

D05 Options, RS485 Values, Read/Write Commands, and Formats

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

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