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Ultrasonic level sensors

Since the ultrasonic transducer is used both for transmitting and receiving the acoustic energy, it is subject to a period of mechanical vibration known as “Ringing”. This vibration must attenuate before the echoed signal can be processed. The net result is a distance from the face of the transducer that is blind and cannot detect an object. It is known as the “Blanking zone”, typically 150 mm to 1 m, depending on the range of the transducer.

It can be used for both water and oil with accurate detection even when the liquid contains solid particulates. Madison’s industry expertise is not only in the manufacture of high-quality ultrasonic level sensors, but also in the recommendation of the proper ultrasonic level sensor type. Madison’s trained experts will consider fluid composition, chemical compatibility, container size and shape, agitation and by-products , and level range to provide the correct solution.

These sensors can be designed to keep the diaphragm free of contamination or build-up, thus ensuring proper operation and accurate hydrostatic pressure level measurements. The time of flight corresponds to the distance from the sensor detecting the return pulse. A special application of float-type sensors is the determination of interface level in oil-water separation systems.

Ultrasonics level sensors work excellently on storage tanks for corrosive materials such as hydrochloric acid , sulphuric acid , and caustic soda . Maxbotix inc. Designs and manufactures ultrasonic sensors for use in level, proximity, and distance sensing. The level sensors are required to have an unhindered path to the surface you want to detect. A sensor emits ultrasonic pulses, the surface of the media reflects the signal and the sensor detects it again. The time-of-flight of the reflected ultrasonic signal is directly proportional to the distance traveled. Open channels are a primary means of transporting, filtering, and metering water.

The lvu700 series reflective ultrasonic transmitter provides level measurement up to 39.3′ with a 4-20 ma output and is configured via its push button display or software. Click the link below to see information on our fl50 ultrasonic level sensor for water tank, or feel free to contact us for more information. A common application of economical infrared-based optical interface point level sensors is detecting the sludge/water interface in settling ponds. By using pulse modulation techniques and a high power infrared diode, one can eliminate interference from ambient light, operate the led at a higher gain, and lessen the effects of build-up on the probe. The microprocessor in a state dependent frequency monitor can actuate valves and/or large pumps with very low power consumption. Multiple switch controls can be built in to small package while providing complex, application specific functionality using the microprocessor.

Non-contact detection is less affected by build-up and handling is easy. Detection may not be possible in environments at high temperature or high pressures, or with dust or obstacles. It all depends what your application will be and what your needs are. Keep these tips in mind as you select, install and use ultrasonic sensors. While they can be tuned to match your application like a glove, doing it wrong can have the opposite effect.

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