The IN-FLOWCTA mass flow meters by Bronkhorst High-Tech, are modular instruments of rugged design according IP65. They can be combined with integrated or close-coupled control valves to form compact digital Mass Flow Controllers, whereby flow ranges are measured and controlled within the range of 10-200 mln/min up to 50-5000 ln/min. These flow meters work on the basis of direct through-flow measurement, following the constant temperature anemometer principle. The instruments contain no moving parts and have no obstructions to the flow path, which makes them ideal for low pressure drop applications and virtually insensitive to moisture or particulates.