Vortex flowmeter from alarm code to repair method 

     Vortex flowmeters are the "loyal guardians" in industrial processes, but when they malfunction, the complex alarm codes can be overwhelming. Don't worry! This manual sorts out common issues and quick solutions for you, enabling you to resume production swiftly.

I. Quick Reference for Common Alarm Codes

     FIU / AL-01 (No Signal / Signal Too Low)

Possible Causes: Incorrect or loose wiring; damaged piezoelectric crystal in the sensor; intense pipeline vibration interference; flow rate too low, not reaching the meter's minimum flow.

Fixing Methods: Check and tighten the cables; perform self-diagnosis of the meter in a no-flow state; reinforce pipeline support or adjust the meter's damping coefficient; verify if the working condition flow is within the measurement range.

ERR / AL-02 (Measured Value Exceeds Range)

Possible Causes: Actual flow far exceeds the meter's upper limit; two-phase flow in the process medium (e.g., gas-liquid mixture); incorrect display unit setting. 

Troubleshooting Method: Verify whether the process operation status is normal; ensure that the medium fills the pipeline and is in a single-phase flow; check the upper limit of the range and the display unit in the instrument parameters.

SYS / Hardware Error

Possible Causes: Internal module connection failure; circuit board moisture or damage.

Troubleshooting Method: Restart after power off; if it occurs repeatedly, please contact a professional for maintenance or replacement.

II. No Alarm but Abnormal Reading

    Problem: Large reading fluctuation

Root Cause: Pipeline vibration interference (such as near pumps or valves); insufficient straight pipe sections before and after the flowmeter.

Countermeasures: Adjust the vibration filtering (damping) settings of the instrument; ensure the requirement of 10D before and 5D after the straight pipe sections.

Problem: Reading is small or zero

Root Cause: Detection elements are covered with impurities (scaling, crystallization); vortex generator is entangled or blocked.

Countermeasures: Shut down the machine, inspect and clean the vortex generator and the sensor head.

Summary:

Most faults of vortex flowmeters are caused by the installation environment and medium conditions. When encountering problems, start troubleshooting from the four steps of "wiring - settings - environment - medium", and you can often quickly identify the problem. Save this quick reference manual and let it be your reliable assistant for stable production!

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