
BF70-1 liquid ultrasonic flow meter works mainly on the transit-time (time-difference) method: ultrasonic transducers upstream and downstream transmit alternately, and the flow velocity is derived from the difference in transit times. Available as in-line, clamp-on (no pipe cutting) and insertion. No moving parts, no pressure loss; the clamp-on form is ideal for retrofit and large pipes.

BF70-2 gas ultrasonic flow meter is designed specifically for gas — natural gas, compressed air and flue gas. Multi-path design improves accuracy; gas sound velocity varies with temperature and pressure, which the algorithm compensates for. Widely used for custody transfer in gas metering.