The customer reported that the "gas analyzer had a 'line blocked' error." the customer checked the sample line and water trap and both were in good condition.The multigas unit was losing waveform on the monitor.After reseating the water trap and sample line the waveforms came back.However, the customer states that the numeric values dropped with waveform.The device was returned to nihon kohden, evaluated, and the reported issue could not be duplicated.This unit was tested for an extended period and the 'line blocked' error was never seen.The water trap that was sent with this unit was used as well as the sample line.This unit passes air calibration and all gases read within service manual specifications.The customer was notified of the evaluation and the multi-gas unit was returned to the customer.Nihon kohden will submit a supplemental report in accordance with 21 cfr section 803.56 when additional information becomes available.
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