Investigation summary: the device was evaluated at nihon kohden where the reported issue was duplicated.The gas sensor, part # cd-314p, was replaced to fix the issue.The sensor is a replaceable component, where the longevity is dependent upon the following factors: instrument and parts must undergo regular maintenance inspection at least every 6 months.If stored for extended periods without being used, make sure prior to operation that the instrument is in perfect operating condition.Water trap should be replaced every 4 weeks or as indicated on the device.Ensuring the environment is optimal as described in the operator's manual.Service history for this serial number shows no recurrence.As indicated under ticket (b)(6), there is no other evidence suggesting predisposition to early failure.The likely cause is lack of on-time preventative maintenance.Due to limited information available regarding routine maintenance, the root cause could not be determined.
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