The FR1100 series of ultrasonic gas flow meters were developed specifically for retrofitting insertion type flow meters such as thermal mass flow meters, optical, Pitot tubes, etc. in applications with low gas velocity. Existing flowmeters are insensitive to gases flowing under 0.1 m/s or 0.3ft/s. Gas vented from storage tanks shall be measured below this limit.
The FR11OO series flow meters are able to measure gas flows as slow as 0.01 m/s with rangeability of 6000:1 which is not achievable by any other technology today. With insensitivity to gas composition and dirt the FR11OO flow meters are indispensable
up—to-date flow metering tools.