During laboratory analysis, the product surveillance technician (pst) observed the software module to be defective, especially when cold.The pst connected the electronic patient gas system (epgs) to a system 1 simulator, attached oxygen (o2) and air at 50 pounds per square inch (psi) and waited the warm-up period.Calibration was initiated and passed.The measurement of the direct current (dc) output voltage from the o2 sensor at 5 liters per minute (l/min) and 100% o2 was 1.71 volts, within specifications of.55-2.758 volts.The epgs was placed into a cold soak at 10 degrees celsius (c) for three hours.When removed from the cold soak, the epgs was unable to be calibrated.Temporarily replacing the software module allowed the epgs to pass calibration.The product will be sent to service to be brought to manufacturer¿s specifications before being returned to the customer.If additional information becomes available on this complaint that would alter the facts and/or conclusion, a supplemental report will be filed accordingly.
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