The Model ST100L is an inline, spool-piece gas mass flowmeter suitable for chlorine gas service, and it is available with an optional built-in Vortab Flow Conditioner. This inline model is designed specifically for line sizes of 1, 1.5 or 2 in. (DN25, DN40 or DN50), and the optional built-in flow conditioner overcomes any lack of available straight-run pipe in the installation. The flow conditioner eliminates both swirl and profile disturbances throughout the full flow range, including transitional region, to produce a repeatable flow profile for accurate, highly repeatable flow measurement.