(b)(4).This complaint is related to mdr #1828100-2015-00808.The srt reported the voltage from the o2 sensor with 100% oxygen was 1.879 volts direct current (vdc), which is within specification.With the blender setpoint at 80% the central control monitor (ccm) reported 82.5%, the external o2 analyzer showed the actual o2 as 76.5%, which is outside the +/- 3% acceptance specification.The srt installed a new o2 sensor and ran applicable phase 2 tests.The unit operated to manufacturer specifications and was returned to clinical use.During the laboratory evaluation, a lab-use only (luo) epgs was within specifications for o2% with the returned o2 sensor installed.The product surveillance technician (pst) installed the returned o2 sensor into a luo epgs and connected the epgs to a system-1 simulator and ccm.He connected the epgs to oxygen and air, entered a perfusion screen on the ccm.After the 15 minute warm-up period, calibration of the o2 sensor was initiated and passed.The measurement of the direct current (d/c) output voltage from the o2 sensor at 5 liters per minute (l/min) and 100% o2 was 1.81 volts which is within the specification of 0.55-2.758 volts.The pst set the test epgs at 5 l/min and 80% o2.The ccm displayed 79.4% and an external o2 meter displayed 79.8%.Also tested the o2 sensor at 21%, 50% and 100%.Nothing was observed that would cause failure.
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