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Roche OPTI R Marc h 2 000 6.54 The optical signal of the detectors is converted by the microprocessor to a numerical readout in conventional units of measure and displayed on the front of the device. Other clinical parameters commonly used for the assessment of oxygen and acid-base status are calculated from these measured values. 6.5.4.3 The Reusable Sensor Cassette The sensor cassette shown without the syringe adapter allows for direct sample asiration from a capillary or Roche Microsampler. The syringe adapter(s) are used when sampling from standard syringes. Once removed from the storage pouch the cassette must be used within one (1) our or be discarded. Ca++ Outlet Port Valve Fillport K+ Na+ Inlet Port PCO2 PO2 / tHb/ SO2 pH 6.5.5 Calibration and Quality Control 6.5.5.1 Calibration During the measurement and calibration processes, diagnostic tests are automatically performed to assure correct operation of the instrument and measurement of the cassette. These tests include automatic checks of the cassette for integrity, temperature control, fluidic control during calibration, proper equilibrium behavior of the sensors during calibration and measurement, automatic detection of bubbles and short sample during aspiration, and automatic detection of low gas, low battery, dirty optics, or worn pump conditions. Calibration of the tHb channel is required every 3 months. This calibration is performed using the Roche tHb Calibration Cassette in a manner similar to other instruments that measure tHb and/or hemoglobin derivatives optically. The tHb calibration verifies the measurement optics and electronics and corrects any potential drift. A second HbCal option is available on the OPTI R. The HbCal – LastBlood option allows the OPTI R to be correlated to another tHb measurement method. When the LastBlood is run, the OPTI R will compensate for any measurement bias, allowing any future measured samples to match the alternate device. For more information, including detailed instructions, on the HbCal options, see Section 6.3 “Quarterly Maintenance” in the OPTI R Operator’s Manual.
