Vortex flow sensing technology relies on measuring the number of vortex pulses generated by a bluff body immersed in the flow stream. A piezo-electric sensor mounted outside of the fluid flow serves as a transducer to convert the vortex pules into electrical pulses which are then counted and converted into useful engineering units by the microprocessor in the meter's display module. By utilizing a design that is free of moving parts and having a transducer that is isolated from the process fluid, the vortex meter offers a number of advantages including low pressure drop, long service life, good particle tolerance, and compatibility with a wide array of fluids. Vortex technology is one of the few flow measurement techniques that is capable of measuring liquids, compressed gases, and steam. SMC's ALVT Series meters are available for line sizes ranging from ½" through 20" and are offered with in-line flanged or wafer style mounting as well as insertion-type with an optional hot-tap ball valve. The ALVT may be calibrated for liquid, gas, or steam service and is available with integrated temperature and pressure measurement for performing compensated mass-flow calculations.