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US 6,205,841 B1Granted
Gas chromatograph
AssigneeShimadzu Corporation
InventorShigeaki Shibamoto
Life of this patent
Estimating the term…
Abstract
Mass flow controllers are respectively placed in the middle of a hydrogen gas tube and air tube connected to a FPD. The flow controllers are controlled to supply hydrogen and oxygen from the nozzle to achieve the optimum mixture rate of hydrogen and oxygen for combustion of each target component in a sample. Since the mixture rate of hydrogen gas and air is optimum for each target component, the quantity of light emitted by the combustion increases and detection of each target component improves.
Claims11
A gas chromatograph comprising:
- a flame photometric detector having;
- a hydrogen flame formed by combusting a mixture of hydrogen and oxygen,
- a sample tube for introducing a sample to said flame,
- at least two different wavelength filters transmitting only the light with target wavelengths corresponding to respective target components of said sample,
- at least two optical detectors detecting said light transmitted through said filters, respectively,
- a chromatographic column, connected to said sample tube, each of said target components included in said sample being separated during passage through said column;
- a hydrogen gas tube supplying said flame photometric detector with said hydrogen;
- an oxygen gas tube supplying said flame photometric detector with said oxygen;
- a first mass flow controller controlling a flow rate of said hydrogen;
- a second mass flow controller controlling a flow rate of said oxygen;
- and
- control means for controlling at least one of said first mass flow controller and said second mass flow controller to achieve different optimum mixture rates of said hydrogen and said oxygen for combustion of each of said components in said sample.
9 more elements
Dependencies are inferred from the claim text.