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' It then passes through the oxidizer to be thoroughly combusted at the pre- <br /> set levels described before All Oxid:zer 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 voil close the isolation valve and open the purge <br />' valve until the level returns to a safe conortson This is done much in the <br /> same manner as the LEL level with the sensor/transmitter sending a s,gnal to <br /> the controller which also sends a signal to the chart recorder <br /> I <br /> I <br />