Creating mass flow parity in a variant multi-channel sampling system
AssigneePicarro, Inc.
InventorsJeffrey Michael Headrick, Wei Jian Chin, Chris W. Rella
Life of this patent
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Abstract
An equal mixture of gas flows from multiple inputs is provided to gas analysis instrumentation, despite the unequal gas flow properties of the inputs often seen in practice. E.g., due to unequal input sample line lengths. We provide gas flow symmetry into a gas manifold that provides the output(s) to the gas analysis instrument(s). Such symmetry has two parts—equal gas flow properties from a set of reference points (one reference point for each input) to the manifold, and equal pressures at the reference points. Such equal pressures can be provided for unequal input gas flow properties by having a bypass valve for each input controlled so as to equalize the pressures.
Claims19
Apparatus for providing a gas sample to analysis instrumentation, the apparatus comprising:
- an automatically controlled gas flow system configured to combine all or a portion of gas flows from two or more system inputs into a combined gas flow provided to the gas analysis instrumentation;
- wherein the automatically controlled gas flow system has one mode of or more operating modes that include a first operating wherein the combined gas flow includes an equal mixture gas flows from a selected two or more of the system inputs;
- wherein the equal mixture of gas flows is provided by equalizing pressures of gas flows from the selected two or more that of have the system inputs that are provided to gas flow paths the same gas flow properties;
- wherein the pressures of gas flows are equalized using two bypass valves, wherein each system input is connected to a respective bypass valve.
Dependencies are inferred from the claim text.