Eliminating sources of potential contamination is of paramount importance. The PFA Flowmeter's molded unibody chamber is free of crevices, seals, and moving parts that could contribute to system contamination. Further, PFA has excellent chemical resistance to a variety of aggressive reagents and ultrapure water.

The PFA Flowmeter combines the vortex shedding principle with an advanced ultrasonic detection system. As fluid passes through the flow chamber, Karman vortices are created, with frequency proportional to flow velocity. Ultrasonic waves are transmitted through the sidewall, perpendicular to the flow, to detect these vortices. The sensitive ultrasonic signals are selectively measured by the detector, unaffected by environmental noise such as low frequency vibration from the system or pipes.

The PFA Flowmeter is available in three sizes (1/2", 3/4" and 1" O.D.), covering a range from 2 to 150 L/min (0.5 to 40 GPM) with accuracy of ±1% F.S. When used with a Thornton 200FLOW with linearization capabilities, further accuracy can be achieved.

The Flowmeter's compact size 2.1 x 2.1 x 2.7" (54 x 54 x 68.5 mm) allows placement into even the most space-limited system. In addition, it can be mounted in any orientation to accommodate system design requirements. The IP65 (NEMA 4X) case is constructed of PPS polymer and assembled with PEEK screws, for excellent resistance in corrosive environments.

Indicators and output signals provide flexibility and redundancy. The outputs include 4-20 mA and pulse for flow-rate, as well as high and low alarms. The Flowmeter's case features a 4-digit local display to show the current flowrate measurement and red warning lights to visually indicate high and low flowrate alarms.

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