www.foodengineeringmag.com/articles/85926-flow-meter
Flow meter
August 1, 2007

Designed to replace mechanical flow meters in applications where liquids can damage or impede meter operation, the Dynasonics series TFXL flow meter clamps onto the outside of a pipe and doesn’t contact liquid. The unit uses a clamp-on sensor, eliminating the need for in-line flanges, pipe fittings, strainers and filters. The meter contains no moving parts and can accommodate pipes 2 in. and smaller.
Dynasonics; 800-535-3569; www.dynasonics.com