Maintenance methods for gas mass flow meters

I. Daily Maintenance

Cleaning & Inspection‌

Regularly remove dust from sensor surfaces using compressed air or approved cleaning agents (avoid corrosive solvents)‌.

Check seals monthly with soap solution for leaks; replace aging O-rings promptly‌.

Parameter Monitoring‌

Verify display readings for abnormalities (e.g., ±5% deviation triggers calibration)‌.

Record flow/temperature trends to detect early performance degradation‌.

II. Periodic Calibration

Zero Adjustment‌

Perform quarterly zero checks (monthly for trade metering) under no-flow conditions‌.

Ensure pipes are fully filled with media during calibration‌.

Laboratory Calibration‌

Return to factory every 1-2 years for full-scale calibration using standard weights (e.g., Micro Motion HPC)‌.

Document calibration certificates and compare historical data‌.

III. Environmental & Installation Optimization

Vibration Control‌: Install rubber isolators or independent supports (>1m from vibration sources)‌.

Temperature Management‌: Use insulation/heat tracing for fluids with large temperature swings (-40~70℃ range)‌.

Stress Relief‌: Loosen flange bolts during installation to allow natural alignment before re-tightening‌.

IV. Troubleshooting

No Signal‌: Check power connections, shielding, and EMI sources.

Measurement Errors‌: Validate media properties (density, impurities) and sensor coil resistance‌.

Key Notes‌:

Follow manufacturer manuals strictly; involve professionals for explosion-proof scenarios‌.

Maintain digital logs of maintenance history and calibration records‌.