The customer reports that the carbon dioxide readings on the multi gas unit works intermittently.No patient harm was reported.The unit was cleaned and evaluated.The reported problem could not be duplicated through testing, trouble shooting, and extended operation of the device.Review of the device history indicates no previous cannot duplicate status.The unit was tested per the operator's manual and the results were recorded on the maintenance check sheet.The unit operates to manufacturer's specification.Nihon kohden continues to investigate the reported event.Nihon kohden will submit a supplemental report in accordance with 21 cfr section 803.56 if additional information becomes available.
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