The XY-TEK clamp-on flow sensors can be clipped on flexible plastic and silicone tubing to measure liquid flow rate non-invasively. The sensors operate using the principle of ultrasonic transit-time difference technology, which is considered to be the most accurate method among some other approaches for non-invasive flow measurement solutions.

In the sensor, two piezoelectric (PZT) crystals transmit/receive ultrasonic waves alternatively in the downstream and upstream directions. The ultrasonic waves propagate through the liquid at an angle relative to the axis of the tubing, and the transit time in the upstream direction is always larger than that in the downstream direction when there is flow. The time difference in both directions is proportional to the mean flow velocity, and together with the tubing cross-section area information, the volume flow rate can be derived.

XY-TEK's ultrasonic clamp-on flow sensors are compact in size, and can measure flow and output results without external circuitry. The sensors are not in direct contact with the liquid in the tubing and will not contaminate the liquid. They are especially suitable for applications where strict hygiene is required, such as bio-pharma processes, medical devices and lab equipment.

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