When an electromagnetic flow meter triggers an empty pipe alarm, the following measures can be taken to resolve the issue:

1. Inspect Pipeline System and Flow Meter Installation: Check if pipeline valves are fully open and examine for any signs of pipeline breakage or blockages. Ensure the flow meter is installed correctly, verifying vertical orientation and central positioning within the pipeline, and make necessary adjustments.

2. Check Fluid Properties: If the fluid conductivity is poor, consider using alternative types of flow meters or treat the fluid to improve its conductivity.

3. Replace or Repair Flow Meter: If the flow meter is damaged, it should be replaced or repaired. Contact professional technicians for assistance.

4. Adjust Empty Pipe Alarm Threshold: The empty pipe alarm threshold is typically set at 500%, a relative value directly related to full pipe conditions and the conductivity of the medium. Before setting the empty pipe alarm threshold, measure the conductivity and resistivity of the medium under full pipe conditions. Consider the time the fluid remains stagnant and adjust the alarm response time accordingly. Therefore, the empty pipe alarm threshold should be adjustable based on site-specific requirements.

5. Clean Electrodes: If the DC voltage measured between DS1 and DS2 exceeds 1V, it indicates contamination of the sensor electrodes, necessitating cleaning.

In conclusion, when an electromagnetic flow meter triggers an empty pipe alarm, carefully inspect the pipeline system, flow meter installation, and fluid properties, and take appropriate actions to resolve the issue. If unable to resolve the problem effectively, it is advisable to contact manufacturer technical support. Leave specialized matters to professionals who can help resolve such issues effectively.