Dwyer Instruments Model UFM compact ultrasonic flow meter

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The Model UFM is a clamp-on ultrasonic flow meter which implements the transit-time difference to measure flow rates in pipes non-invasively.

It has a compact and lightweight design featuring an easily installed, all-in-one clamp-on unit. The unit can measure velocity and flow in pipes with outside diameters ranging from 24.89 to 117.35 mm. The screen offers easy-to-read text with a convenient backlight for visual comfort. The model comes with a volume pulse and 4 to 20 mA flow rate output.

Two sensors located in the guide rail are placed on the exterior of the pipe, and each transmits an ultrasonic pulse through the pipe and fluid to the other. The velocity of the liquid flowing through the pipes causes the pulse to accelerate or decelerate. The difference in the transit times of the two pulses is used to calculate the flow rate, and the use of transit time allows the flow meter to be unaffected by pressure or temperature changes.

Applications include flow measurement for heat metering; chilled water metering and monitoring; potable water metering and monitoring; and process water metering and monitoring.