Apparatus for continuously measuring the hydrocarbon concentration in a gas flow
First Claim
1. In an apparatus for continuously measuring the hydrocarbon concentration in a gas flow, including at least one flame ionization detector having a combustion chamber housing a burner flame and in the area of the burner flame electrodes to which direct voltage is applied and between which a current flows upon burning of the sample gas which current is a function of the portion of hydrocarbons in the gas flow, the improvement comprising:
- capillary means with an inlet and an outlet in communication with the flame ionization detector for adjusting the amount of sample gas to be supplied to the flame ionization detector;
first suction means connected to the combustion chamber for applying an underpressure within the combustion chamber of the flame ionization detector to allow sample gas to be drawn through said capillary means and into the combustion chamber; and
second suction means communicating with the inlet of said capillary means and arranged parallel to said first suction means for diverting an excess amount of withdrawn sample gas and releasing it directly to the atmosphere.
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Accused Products
Abstract
An apparatus for continuously measuring the hydrocarbon concentration in a gas flow includes at least one flame ionization detector with a combustion chamber housing electrodes between which a current flows due to ionization in the area of a burner flame. The combustion chamber of the flame ionization detector is connected to a suction pump in form of a venturi tube for applying an underpressure in the combustion chamber so as to allow especially sample gas but also burner gas and oxidizer to be drawn into the combustion chamber.
12 Citations
7 Claims
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1. In an apparatus for continuously measuring the hydrocarbon concentration in a gas flow, including at least one flame ionization detector having a combustion chamber housing a burner flame and in the area of the burner flame electrodes to which direct voltage is applied and between which a current flows upon burning of the sample gas which current is a function of the portion of hydrocarbons in the gas flow, the improvement comprising:
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capillary means with an inlet and an outlet in communication with the flame ionization detector for adjusting the amount of sample gas to be supplied to the flame ionization detector; first suction means connected to the combustion chamber for applying an underpressure within the combustion chamber of the flame ionization detector to allow sample gas to be drawn through said capillary means and into the combustion chamber; and second suction means communicating with the inlet of said capillary means and arranged parallel to said first suction means for diverting an excess amount of withdrawn sample gas and releasing it directly to the atmosphere. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification