Our field service engineer has investigated the reported anesthesia workstation on site.The pressure transducer printed circuit board (pcb) was replaced to resolve the issue and sent back for further investigation.The provided logs confirm the reported issues.The returned pressure transducer pcb has been tested in an anesthesia workstation.It passed the first system checkout.A case was started, after around 3 hours it started alarming for fio2 low and 2 technical errors that indicate fresh gas airway pressure sensor error.A system checkout failed directly after that.The zero pressure voltage has been measured on the returned pcb after that, it showed a major drift 11,23v.It was noticed as well with ocular inspection that there was a contamination around the sensor.No further inspection is needed as ingress of liquid substances can lead to a short circuit/malfunction of the affected part.The pressure sensor is confirmed that it is drifting with time, which caused the reported issue.A previous investigation on similar problem concluded that the liquid contamination had the same substances that is used in cleaning agents.Excessive use of cleaning detergents may lead to the reported issue.A defective pressure transducer may lead to inaccuracy in pressure measurement.Appearance of this failure will be noticed by the user by generated high priority alarms.If present, the fault will be detected during the system check out.
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