Alarm and System Status Overview
Alarm - A: Critical Fault (Failed)
The system classifies this alarm according to the “Failed” severity level as defined in the NAMUR NE107 standard.
This alarm is triggered under the following fault conditions:
Paddlewheel malfunction
Magnetic field interference
Internal chip or sensor error
When Alarm - A is active, the LCD backlight flashes red to indicate a critical system failure.
Alarm bit
Error Content
Alarm Code
Alarm trigger
7
NA
6
NA
5
NA
4
NA
3
NA
2
NA
1
NA
0
Paddle wheel abnormality
D01
Alarm - B: Out of Specification
This alarm indicates that the flow meter is operating outside of its designed specification range. The severity level is recommended to follow the “Out of Specification” category as defined in the NAMUR NE107 standard.
This alarm is typically used to signal:
Flow exceeding user-defined thresholds
Other notable operating conditions that require attention
The thresholds and logic can be configured in the D-series parameters.
When Alarm - B is active, the LCD backlight turns solid red, indicating a non-critical but attention-required condition.
Alarm bit
Error Content
Alarm Code
Alarm trigger
7
Totalised Flow Exceeds or Falls Below Target Threshold
D08,D09,D10
When the cumulative condition (D09 parameter) is set to be greater than the cumulative target (D10 parameter) → Alarm is triggered, When the cumulative condition (D09 parameter) is set to be less than the cumulative target (D10 parameter) → Alarm is triggered, D08 is the cumulative alarm, D09 is the cumulative condition, and D10 is the cumulative target
6
Data Exceeds Upper Limit of Analogue Output Current Range
D11
5
Data Exceeds Low Limit of Analogue Output Current Range
D11
4
NA
3
NA
2
pulse over lap
D13
1
Instantaneous Flow Rate Exceeds Upper Limit
D04
0
Instantaneous Flow Rate Exceeds Low Limit
D04
Alarm - C: Maintenance Required
This alarm indicates that the flow meter requires maintenance. The recommended severity level follows the “Maintenance Required” classification as defined in the NAMUR NE107 standard.
When Alarm - C is active, the LCD backlight remains solid red, alerting the user to perform preventive or corrective maintenance.
Alarm bit
Error Content
Alarm Code
Alarm trigger
7
NA
6
NA
5
NA
4
NA
3
NA
2
NA
1
Iout(0/4-20mA) impedance is too large or there is no connection
0
NA
Alarm - D: Function Check
This alarm indicates that the device is currently undergoing configuration, simulation, or other manual intervention and is not actively monitoring in real time.
The recommended severity level follows the “Function Check” category as defined in the NAMUR NE107 standard.
When this condition is active, bit 1 of the alarm register is set to 1, indicating the system is not in monitoring mode due to user interaction.
During this state, the LCD backlight will remain solid amber (orange) to indicate the flow meter is in a non-operational configuration mode.
Alarm bit
Error Content
Alarm Code
Alarm trigger
7
NA
6
NA
5
NA
4
NA
3
NA
2
NA
1
NA
0
The host is not on the monitoring screen
System Status
The system status is represented as an 0~7 bit status code, with each bit indicating a specific operating condition or state of the device.
Alarm bit
Error Content
Alarm Code
Alarm trigger
7
NA
6
NA
5
NA
4
NA
3
NA
2
NA
1
NA
0
NPN On State
NPN status: Close = 1, Open = 0 Not including Paddle Pulse status
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