Result of investigation: the suspect device has been returned for evaluation, and the technician was able to verify the reported failure as pressure values were only around 3.3-3.5 cmh2o at a flow of 8 lpm.Evaluation also revealed pinholes on the flow meter outlet line.After replacing the affected tubes and verifying tightness, pressure values are now within range.The unit then underwent calibration, performance verification, and electrical safety test with no issues.Therefore, root cause has been determined to be leak in the internal tubing.
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