If a gauge is not accurate within 3 percent of the full scale, what action should be taken?

If a gauge is not accurate within 3 percent of the full scale, what action should be taken?

• A. Ignore the reading
• B. Recalibrated or replaced
• C. Return to service without adjustment
• D. Test again after next cycle

Answer: (B)

Gauges must stay within their stated accuracy so readings reflect the true pressure or level. If a gauge is not accurate within 3 percent of full scale, the reading can no longer be trusted for safe operation or correct maintenance decisions. The remedy is to recalibrate the instrument so its output matches a known standard, or replace it if it cannot be brought back within tolerance or is damaged. Verification should be done with a reliable reference (such as a calibrated pressure source or deadweight tester). If recalibration brings the gauge within tolerance, document the adjustment and continue routine monitoring. If it cannot be brought within 3 percent, the gauge should be removed from service and replaced to ensure accurate monitoring going forward. Ignoring the issue or re-testing later does not address the drift and could mislead system operation or testing results.

Gauges must stay within their stated accuracy so readings reflect the true pressure or level. If a gauge is not accurate within 3 percent of full scale, the reading can no longer be trusted for safe operation or correct maintenance decisions. The remedy is to recalibrate the instrument so its output matches a known standard, or replace it if it cannot be brought back within tolerance or is damaged.

Verification should be done with a reliable reference (such as a calibrated pressure source or deadweight tester). If recalibration brings the gauge within tolerance, document the adjustment and continue routine monitoring. If it cannot be brought within 3 percent, the gauge should be removed from service and replaced to ensure accurate monitoring going forward. Ignoring the issue or re-testing later does not address the drift and could mislead system operation or testing results.