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I <br /> It then passes through the oxidizer to be thoroughly combusted at the pre - <br /> set levels described before . All Oxidizer chambers are sized for a one second <br /> retention time . <br /> All vapors are monitored for LEL % prior to entering the oxidizer . and are <br /> maintained at a pre -set level by a controller in the panel which receives a <br /> signal from a sensor transmitter in the process line . The controller modulates <br /> the dilution valve to allow an accurate flow of vapor. The system also <br /> contains a manual valve to add further dilution on some sites that have very <br /> high concentrations . We also monitor Oxygen level and record it, if the level <br /> drops too low the system will close the isolation valve and open the purge <br /> valve until the level returns to a safe condition . This is done much in the <br /> same manner as the LEL level with the sensor/transmitter sending a signal to <br /> the controller which also sends a signal to the chart recorder. <br />