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Investigation of this complaint has been completed.The field service engineer (fse) was on site, and the anesthesia system was investigated.The investigation concluded that both expiratory and reflector gas pressure transducers pcb's were faulty and needed to be replaced.Additionally, a faulty pcb expiratory channel was identified and replaced.The replaced parts were not available and can therefore not be investigated.After the replacement, the anesthesia system was successfully tested and cleared for clinical use.The evaluation of the received device logs confirms the reported problem.The test log shows that the pressure transducer failed due to the measured zero pressure offset for the expiratory and reflector pressure transducers pcb's being out of range.The pressure transducer pcb has a factory calibrated zero pressure offset value that normally is 2 ± 0.5 v.During system checkout, the zero pressure offset is measured and if the measured offset is outside the allowed limit (±300 mv from factory calibrated value) the test will fail.A faulty pressure transducer pcb may lead to inaccuracy in pressure measurement.This will be detected during system checkout and high priority alarms will be generated if the failure occurs during treatment.Our conclusion, based on the fse investigation and evaluation of the logs, is that the reported failure was caused by the expiratory and reflector pressure transducers pcb's.
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