Probes for natural gas sample collection and analysis must extend far enough into the pipeline to avoid contaminants at the pipe wall, but must not be so long that there is a risk of flow induced resonant vibration and failure. PRCI has sponsored a project to determine the minimum probe depth for obtaining a representative single-phase gas sample in flows with small amounts of contaminants. Phase 2 of the project evaluated the effect of probe tip design and insertion length on the fidelity of gas samples from flows carrying small amounts of liquid hydrocarbons.