Gas quality has always been an important issue, but within the last year it has become a critical issue for many pipeline companies. With the current energy crunch causing problems throughout the world, and gas prices at historical high levels, anyone who can sink a well and start pumping natural gas is doing so. Unfortunately, gas quality has taken a back seat to the urgency of fulfilling key quality issues. One of the key quality factors is moisture content. This paper will review the different sensor technologies in use today and also address key issues and proper procedures in assembling a sampling system to provide a clean, representative gas sample to the sensing device