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3. Operational Modes 3.1. Reference Gas Calibration Sequence Reference gas calibration sequence is shown in Figure 3. Start No Signal = 0? Yes Purge reference gas hose Expose sensor to reference gas Calibrate sensor Yes Within tolerance? Calibration performed No Calibration rejected Set REJECT output Purge system To Standby Figure 3 Reference gas calibration sequence flow chart. 6 INFICON - Maintenance Manual AP29 ECO