Flow meters must be calibrated how often?

• A. Yearly
• B. Daily
• C. Monthly
• D. Weekly

Answer: (A)

Calibration keeps flow readings trustworthy because readings drift over time from wear, fouling, and changing process conditions. Because of that drift, a full recalibration is typically done on a yearly basis to maintain accuracy for process control and reporting. Daily checks are useful to verify the meter is functioning, but they don’t replace a proper calibration. Monthly or weekly calibrations are generally more frequent than needed for most meters unless the instrument or regulatory requirements specify otherwise. Always follow the meter’s calibration procedure and your facility’s QA/QC plan.