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An ultrasonic flowmeter is also known as the non-intrusive Doppler flow meters, and is a volumetric flow meter that requires particulates or bubbles in the flow. Ultrasonic flowmeters are the perfect flowmeter for waste water applications or any polluted liquid that is conductive or water based. In general, ultrasonic flowmeters won¡¯t work in distilled water or drinking water, and aerations require sanitary fluid applications like the peak flowmeter. Ultrasonic flowmeters are as well perfect for applications where little pressure drop, chemical compatibility, and low maintenance is necessary.
What is the Idea Behind Ultrasonic Flowmeters?
The essential idea of purpose allows the frequency to shift, which is known as the Doppler Effect, of an ultrasonic signal, and when it is reflected by floating atoms of gas also known as gas bubbles that are in motion. This metering procedure maximizes the physical experience of a sound wave that changes frequency only when it is reflected by the moving particles in a flowing liquid. Ultrasonic sound waves are transmitted into a pipe with the flowing liquids, and are the reflected by the ultrasonic wave with a slightly diverse frequency that is completely proportional to the rate of flow of the liquid. The technology of today¡¯s word requires that the liquid contain at least 100 parts per million (PPM) of 100 micron or larger suspended particles or bubbles
How do the Designs Vary?
The clamp-on ultrasonic flowmeters come in a single or a dual-sensor version. In the single-sensor version, it transmits and can receive crystals that are ported into the same sensor body, which is clamped on to a single point of the pipe¡¯s surface, and a coupling compound is used to ultrasonically connect the sensor to the pipe. In the dual sensor version, the transmit crystal is in one sensor body, while the receiving crystal is in a different sensor body.
Clamp-on Doppler flowmeters are subject to intrusion from the pipe wall itself, also from any air space between the sensor and the wall, and if the pipe walls are made of stainless steel, it could conduct the transmit signal far enough so that the returning echo will be shifted enough to interfere with the reading. There is also a built-in acoustic discontinuity in copper, concrete-lined, plastic-lined, and fiberglass-reinforced pipes, which are significant enough to either completely, scatter the transmitted signal or attenuate the return signal. This dramatically decreases flowmeter accuracy and most of the time clamp-on meters will not work at all if the pipe is lined. |
