The GFC Series gas filter correlation analyzers measure low ranges of gases (CO2, CO2 and N2O) detecting models available​ by comparing infrared energy absorbed by a sample to that absorbed by a reference according to Beer-Lambert Law. All GFC Series instruments offer an advanced color display, capacitive touch screen, intuitive user interface, flexible I/O and built-in data acquisition capability. All instrument set up, control and access to stored data and diagnostic information is available through the front panel or via RS-232.