Set the lower limit of the normal flow range. Default: 0.
(D04 , D05 , D06 , and D07 work together to enable the flow range over-limit alarm function.)
Flow Range Limit Alarm Example (Click to Expand)
D05 Upper Limit: 30 LPM
D06 Lower Limit: 10 LPM
D07 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
If either D05 or D06 is adjusted, the other must also be set; otherwise, the display may not function correctly. If both are unset, default values are D05 = 100, D06 = 0.
DND Mode
When Do Not Disturb (DND) mode is enabled:
The flow meter detects abnormal conditions but the red backlight will not turn on.
Example: Alarm-A “Paddle wheel abnormality” will not trigger the backlight in DND mode.
Abnormal conditions are still displayed on the Status/Alarm page.
If connected via RS485, the monitoring system still receives the alarm signal.
OCT alarm outputs continue to operate 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 Direction Buttons:
Left Gray: Previous Page, decrease value, or select item
Right Gray: 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 D04:
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 D04 to enable the flow range over-limit alarm
2
Set D05 to define the flow upper limit
3
Set D06 to define the flow lower limit
4
Set D07 to define the flow hysteresis
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.
D06 Options, RS485 Values, Read/Write Commands, and Formats
D04 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 D04 FlowLIM Ala, 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).
D05 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 D05 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).
D06 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 D06 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).
D07 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 D07 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).
Blue Button: Leftmost button: Return, exit, or save settings.
Left Gray: Previous Page, decrease value, or select item
Right Gray: Next Page, increase value, or select item
Orange Button: Rightmost button: Enter settings, edit, or confirm selection
