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Allow the probe to cool before handling (about 5 minues). 10. End a test by first removing the probe from the flue-gas stream, and then allowing the pump to run until the O2 reading reaches approximately 20.9%. Turning OFF the Analyzer 11. Turn OFF the analyzer by pressing the I/O button. There is a 5-second delay before the analyzer actually turns OFF, during which time the unit can be turned back ON by pressing the ENTER button. A Fyrite Tech 60 will not turn OFF if a high level of CO is s