Patent ID: 8220311
Filing Date: 2012-07-17
Classification: G01N

Abstract:
1. A device for measuring concentration of a paramagnetic gas, the device comprising: a measuring cell having a closed cavity therein; a measurable gas conduit extending into the cavity for supplying a measurable gas to the measuring cell; a reference gas conduit extending into the cavity for supplying a reference gas to the measuring cell; a first microphone differentially coupled to the measurable gas conduit and the reference gas conduit; a second microphone located at a predetermined distance from the reference gas conduit; and an electromagnet positioned in the cavity, the electromagnet having a core with spaced opposing magnetic poles forming an air gap therebetween, the electromagnet being energizable for establishing a magnetic field in the air gap, at least one of the magnetic poles having passages extending therethrough and opening into the air gap, the passages being connected to the gas conduits for supplying measurable and reference gases to the air gap.