The device was inspected by an engineer of the local s&s organization.It was found that the device couldn't be supplied with electrical energy - the device's power supply did not work and, the internal battery was depleted.The power supply was replaced, consequently.The workstation was subject to intensive testing afterwards and found fully compliant to specification.The course of event could not be reconstructed in detail since it was not possible to secure a log file.Based on the findings made in follow-up of the event it is plausible that the power supply failed during use and the device ran on battery until the latter was depleted.The device is designed to post an alarm if mains power gets lost for any reason and continues operation on battery supply.The residual battery capacity is being displayed; with a fully charged battery the minimum runtime is 30 minutes.Battery depletion alarms will be posted if the residual capacity underruns 20% and 10%, respectively.The alarm functions have been tested after repair exchange of the power supply.No deviations were found and thus, it is concluded that appropriate alarms have been posted during the course of event.The device is almost 13 years old; the malfunction of a single electronic component after such long time of use can be considered acceptable.Appropriate risk mitigation measures are in place - the device posts corresponding alarms to indicate the loss of mains power supply; the device continues operation on battery which leaves room enough for the users to react.Finally, manual ventilation with the built-in breathing bag remains possible even in switch-off state.Dräger concludes that use error was at least a contributing factor in the event.
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