Inlet sampling method and device

摘要

An inlet apparatus is disclosed. The apparatus may include a first conduit for sampling, and a second and third conduit for directing flow throughout the inlet apparatus. Flow may be induced in two opposite directions through the second conduit, which affect the flow of gas through the first conduit for sampling. The various conduits of the apparatus may be connected to a device for inducing flow in different directions. The duration of the flow in a particular direction affects the amount of sample gas that enters a detection device.

主权项

1. A method of sampling, comprising:
introducing fluid from an ambient environment into an inlet assembly comprising first, second and third conduits, and
a flow direction device comprising one or more flow regulators; and transitioning between a first step and a second step by adjusting the one or more flow regulators from a first configuration to a second configuration, wherein:
the first step comprises:
operating the one or more flow regulators in the first configuration to direct the fluid from the ambient environment along a first flow path defined at least in part by the first, second, and third conduits, the flow path being concurrent through at least a portion of each of the three conduits; andthe second step comprises:
operating the one or more flow regulators in the second configuration to direct fluid along a a second flow path defined at least in part by the first, second, and third conduits, the flow through at least a portion of each of the conduits being counter current to the flow through at least a portion of one or both of the other conduits.