Introduction: Why Flowmeters Fail in Real Projects
Electromagnetic flowmeters are widely used for conductive liquids due to their high accuracy and reliability.
However, in real industrial environments, many failures are not caused by the instrument itself — but by installation, maintenance, or environmental factors.
In this article, we share 4 real cases from the field to help you quickly identify and avoid common issues.
⚠️ Case 1: Flow Reading Gradually Drops to Zero
Application: Saturated brine (electrolysis process)
Problem:
After several months of operation, the flow reading gradually decreased until it reached zero.
Root Cause:
Inspection revealed that the electrodes were coated with a layer of rust-like deposits, reducing conductivity and signal detection.
Solution:
After cleaning the electrode surface, the flowmeter returned to normal operation.
👉 Insight:
Electrode contamination is one of the most common causes of measurement failure in conductive liquids.
⚠️ Case 2: Maximum Output with Alarm
Problem:
The flowmeter displayed maximum output continuously, accompanied by an alarm.
Diagnosis:
Error code indicated a process alarm related to wiring or grounding.
Root Cause:
The grounding wire was disconnected, causing signal instability.
Solution:
After restoring proper grounding, the alarm disappeared and measurement returned to normal.
👉 Insight:
Proper grounding is critical for electromagnetic flowmeter stability.
⚠️ Case 3: Sudden Failure After Heavy Rain
Problem:
After heavy rainfall, the flowmeter displayed maximum reading with alarm.
Diagnosis:
Parameter settings were correct, but inspection of the junction box revealed water ingress.
Root Cause:
Damaged cable insulation allowed moisture to enter, affecting signal transmission.
Solution:
- Dried the internal components
- Repaired damaged cable insulation
The flowmeter returned to normal operation.
👉 Insight:
Ingress protection (IP rating) must be ensured, especially in outdoor installations.
⚠️ Case 4: Inconsistent Readings Between Two Flowmeters
Problem:
Two identical flowmeters installed on the same pipeline showed different readings, with one fluctuating.
Diagnosis:
Inspection during shutdown revealed a damaged gasket, with part of it protruding into the pipe.
Root Cause:
The damaged gasket caused flow disturbance, affecting measurement accuracy.
Solution:
After replacing the gasket, both flowmeters showed consistent and stable readings.
👉 Insight:
Even small installation defects can significantly impact flow measurement.
🧠 Key Takeaways: 4 Main Causes of Flowmeter Failure
From these real cases, most electromagnetic flowmeter issues can be traced to:
- Electrode contamination
- Poor grounding
- Water ingress / insufficient protection
- Improper installation (gaskets, positioning, etc.)
👉 In most cases, the problem is not the flowmeter itself — but how it is applied.
🚀 Practical Advice for Engineers
To ensure stable and accurate measurement:
- Regularly inspect and clean electrodes
- Ensure proper grounding at all times
- Protect cables and junction boxes from moisture
- Verify installation quality (especially sealing and alignment)
📩 Need Support for Your Project?
If you’re experiencing similar issues or selecting a flowmeter for your application:
👉 Feel free to contact us for technical support and selection guidance.
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