Patent ID: 6148659
Filing Date: 2000-11-21
Classification: G01N

Abstract:
A gas concentration monitor for measuring concentration of a portion of a gas mixture comprised of:a. an input line which receives a gas sample that contains a plurality of different gases, said gas sample including the portion of measurement interest;b. a gas flow bridge configuration having gas conveying conduit legs connected to the input line the bridge comprised of:i. a first leg connected to the input line having an entry orifice and an exit orifice through which a portion of the gas sample may flow;ii. a second leg connected to the input line having an entry orifice and an exit orifice through which a second portion of the gas sample may flow;c. a pump connected to the first leg and to the second leg for moving the sample through the bridge;d. a gas removal device connected to one leg of the bridge between the entry orifice and the exit orifice of that leg, the gas removal device being able to remove at least one of the plurality of different gases from the gas sample; ande. a differential pressure gauge connected between the first leg and the second leg at locations between the entry orifice and the exit orifice of each leg.