Thermal mass flow controllers are traditionally calibrated for a specific gas – typically a surrogate such as Nitrogen (N2) – a desired flow range, and a set of operating conditions. Over time, the use of conversion factors based on a ratio of specific heats between the surrogate and the desired gas came into use as a way for users to configure a single mass flow controller for multiple gases. This method for configuring multiple gases is at the heart of the Brooks Biotech Option’s Performance package. Read more
