Patent ID: 6609433
Filing Date: 2003-08-26
Classification: G01N,Y10T

Abstract:
An apparatus for mixing gases comprising:i. a first manifold forming an inlet port, a common port and a mixer port all in common communication with each other; ii. a second manifold in communication with said common port and forming a sample port and a discharge port all in common communication with each other; iii. a first gas flow control means adapted to couple to a first pressurized gas supply and operable to control a flow of gas through the inlet port of said first manifold in response to a control signal; iv. a second gas flow control means operable to control a flow rate of gas between said first and second manifolds in response to a control signal; v. a third gas flow control means operable to control a flow rate of gas through the discharge port of said second manifold in response to a control signal; vi control means to produce a control signal for each said first, second and third gas flow control means; vii a catalytic combustion detector (CCD) in communication with said mixer port operable to produce output signalling representative of the content of a selected gas of a gas mixture passing therethrough; and viii threshold means operatively coupled to said control means whereby said control means produces control signals for said first and second gas flow control means to obtain an output signalling of said CCD below a maximum output signalling level, whereby any gases supplied to the inlet port and sample port are mixed and expelled through said mixer port in proportions set by said control means.