Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Flame ionization detector
Reexamination Certificate
1997-12-05
2001-05-29
Warden, Jill (Department: 1743)
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Flame ionization detector
C422S080000, C422S098000, C436S154000
Reexamination Certificate
active
06238622
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to instruments used to evaluate selected components of a chemical sample. More specifically, the present invention relates to a flame ionization detector.
Flame ionization detectors are typically used to analyze hydrocarbon components in a sample taken from a source such as exhaust from an industrial smoke stack, an automobile engine during its testing or adjustment, and high purity gasses during their production and testing.
A flame ionization detector burner typically includes a housing with a flame cavity with intake passageways and an exhaust passageway. Inside the flame cavity there is a burner that receives fuel, air, and a sample to create a flame to ionize the samples. An ionization collector plate collects the ions and produces a signal. representative of the concentration of sample ions. Flame ionization detectors burners are often located in hazardous locations where flammable vapors are present in which the flame ionization detector is required to meet hazardous location approvals. Flame ionization detector burners are also often incorporated into other instruments such as hydrocarbon analyzers or gas chromatographs.
Flame ionization detector burners are composed of a variety of components that often require seals and can be complex and expensive to manufacture and service. Flame ionization detectors have constraints that limit flame stability resulting in reduced accuracy.
Additionally, flame ionization detector burners have thermal constraints that limit the proximity of their installation near heat sensitive components such as instrumentation.
For the foregoing reasons there is a need for a flame ionization detector that is simpler to manufacture, has improved flame stability, and has reduced thermal constraints.
SUMMARY OF THE INVENTION
A flame ionization detector burner, includes a housing having a generally cylindrical flame cavity therein extending along a generally longitudinal axis of the housing and a housing exterior with intake passageways communicating between the housing exterior and the flame cavity for passing fuel, air and sample flows into the flame cavity and an exhaust passage communicating between the housing exterior and the flame cavity for passing exhaust gasses out of the flame cavity. A burner carried in the housing cavity receives the fuel, air, and sample flow and generates a flame to ionize the sample. An ion collector plate spaced away from the burner carried in the flame cavity collects sample ions and provides an electrical output representative of the sample ions to the housing exterior via an electrical feedthrough between the flame cavity and the housing exterior. The housing further comprises at least two cylindrical sidewalls removably joined together along the general longitudinal axis of the housing.
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Brochure, “Model 7750—Process Gas Chromatograph,” Rosemount Analytical, Feb. 1997.
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Rosemount Analytical Inc.
Warden Jill
Westman Champlin & Kelly P.A.
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