At The Forefront Of Clamp-On Technology For Over 30 Years

The application of clamp-on flow ultrasonic flow’ meters to the heavy industries, particularly Oil & Gas, is one of ABLE’s foundation stones. In fact, ABLE’s founder, Mike Shortall installed and commissioned the very first clamp-on ultrasonic flow meter to be deployed on an offshore North Sea platform in the early 1990’s.

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Frequently Asked Questions
  • How does a clamp-on ultrasonic flowmeter operate?
    Our range of clamp-on ultrasonic flowmeters operate according the Transit-Time ultrasonic principle. This means that the transit time difference between the transmitted and received signal is measured by the two associated sensors. It is a more efficient way of determining flow than most other measurement systems providing an extremely accurate measurement.The clamp-on sensors are installed on the exterior of the pipe. They receive ultrasonic pulses through the pipe wall. The fluid (or gas) flowing inside the pipe causes time differences, frequency deviations and phase separation in the ultrasonic signals. These are evaluated by the flowmeter and thus a very reliable measurement is achieved.The main principle is that sound waves that go with the current flow are faster than those that go against the current. The difference in the flowtime of these signals is directly proportional to the flowrate of the fluid or gas.With the help of electronics incorporated in the flowmeter, elements that can influence the measurement are compensated (for example flow profile, fluid type and tube material).
  • What is the accuracy of ultrasonic flowmeters?
    For volumetric flow measurements, our flowmeters can achieve an uncertainty of 1 to 3 % of the measured value depending on the specific application.Uncertainty of approximately 0.5 % can be achieved with on-site process calibration.In case of flow velocity measurements, the flowmeters achieve an uncertainty within 0.5 % of the measured value.
  • Which pipe materials are suitable for ultrasonic flow measurements?
    A clamp-on ultrasonic flowmeter is suitable for all commonly known pipe materials, whether ferrous, alloy or plastic.Ultrasound flowmeters also work on pipes with an inner lining, provided the pipe is acoustically conductive and there are no layers of air between the different pipe materials.Steel, stainless steel, asbestos cement, aluminium, copper, brass, lead, gray casting, ductile iron, nickel, tin, titanium, glass, polyethylene, PVC, CPVC, acrylic...This is just a small selection of the pipe materials suitable for ultrasonic flow measuring.

Why use clamp-on flow meters?

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