| CPC G01N 1/26 (2013.01) | 29 Claims |

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1. A sampling manifold comprising:
a) two or more input sampling ports;
b) a sealed bulk flow section connected to the two or more input sampling ports, wherein gas flowing through the two or more input sampling ports enters the sealed bulk flow section;
c) a flow focusing element inside the sealed bulk flow section, the flow focusing element comprising a plurality of flow ports, wherein the flow ports are in fluid communication with the input sampling ports;
d) a sample line in fluid communication with a flow port selected from the plurality of flow ports, and one or more exit outlets in fluid communication with one or more flow ports other than the selected flow port,
wherein the flow focusing element comprises a sample flow path between a selected input sampling port, which is in fluid communication with the selected flow port, and the sample line, and comprises one or more bulk flow paths between input sampling ports other than the selected input sampling port and the one or more exit outlets;
the flow focusing element being configured to direct gas flowing through the selected input sampling port to flow into the selected flow port and into the sample line, and to direct gas flowing through the input sampling ports other than the selected input sampling port to flow into the one or more flow ports other than the selected flow port and into the one or more exit outlets.
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