Patent ID: 7752886

Claim:
A gas analyzer, comprising: an electromagnet that has spaced opposing magnetic poles forming an air gap with a magnetic field therebetween; a power source for supplying cyclically variable electrical current/voltage to said electromagnet; a sample gas conduit and a reference gas conduit opening into said air gap, said sample gas conduit carrying a sample gas comprising a gas mixture to be analyzed, and said reference gas conduit carrying a reference gas having a known concentration of a predetermined gas component; an exit conduit communicating with said air gap for removing an intermixed sample comprising said sample gas and said reference gas from said air gap with the magnetic field; a pressure detecting microphone connected to said sample gas conduit and to said reference gas conduit, said pressure detecting microphone adapted for sensing gas pressures at a first predetermined acoustic measuring frequency and a second predetermined acoustic measuring frequency; and electronics connected to said pressure detecting microphone to receive a first acoustic pressure signal component and a second acoustic pressure signal components, said electronics forming intermediate output signals comprising at least: a first intermediate output signal describing content of a paramagnetic gas component in the sample gas, and a second intermediate output signal including content data of a second gas component in the sample gas, wherein said electronics comprise an amplifier with an input connected to receive said first acoustic pressure signal component and said second acoustic pressure signal component, wherein said amplifier generates the first intermediate output signal and the second intermediate output signal, wherein said electronics comprise a calculation unit with means to provide a first difference to describe the content of a gas component in said sample gas, and wherein the first difference is calculated by subtracting the second intermediate output signal and the first intermediate output signal at their acoustic measuring frequencies.