DS-386 Real Time Leak Detection System

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Sensitive & fast enough to sense the human eye blink & display it!

Can detect wide range of leakage in a variety of configurations.

THE ULTRASONIC PRINCIPLE: Dedicated Systems sense ultrasound frequencies between 20 kHz and 100 kHz. Since ultrasound is a high frequency, short wave signal, it has certain properties that make it an ideal medium for on-line leak detection and product quality inspection. These minute sound waves tend to be highly directional and localized. The source of emission can be located and isolated from other non-essential sounds providing accurate test results. Sensing at the speed of sound, the onset of a monitored ultrasonic event will be detected in real-time.

CUSTOMIZED SENSING SOLUTIONS: Since 1973, our engineers have been producing unique sensor designs to meet the challenge of parts inspection. For example, multiple test point sensing may call for an array of scanning modules placed linearly along a test path, or there may be a need for a "transducer ring" that surrounds circular parts.

ENGINEERING EVALUATION CONSULTATION PROGRAM: Our Engineering Evaluation Consultation Program is formatted to assist our clients in designing the correct system for their needs. This cooperative program is a recommended option for complex projects. For a fee, we will send an engineer to your facility to review the specifics of the project and work with your staff to design the proper test procedure. This may include transducer design, sound enclosure recommendations or anything relevant to the project. Start up engineering supervision may also be arranged. (For details, please contact us via phone, fax, or e-mail.)

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Design Flexibility: Parts can be tested or monitored through one of three modes:

Pressure: During a pressure leak, as the fluid escapes it produces a turbulent flow with strong ultrasonic components. Since ultrasound is localized to the point of emission, the leak can be readily detected. Leak rates to as low as 1x10¯³ ml/sec. may be detected.

Vacuum: A gas passes from the atmosphere side to the vacuum producing a turbulent flow that generates ultrasound. Since the ultrasound is produced in the vacuum side, the detectable leak rate is slightly lower than that of a pressure leak.

Typical Liquid Leak Amplifier Application Examples:

DM: Dunk Method
The parts are immersed in LLA and the excess liquid is recycled through a filter to remove contaminants.

WM: Waterfall Method:
The parts are run under a waterfall of LLA and the excess liquid is

SM: Spray (or Mist) Method:
A liquid stream is directed to a particular area on the part so that the remaining areas stay dry.

An optional approach to the above applicator configurations is to use available personnel to manually apply LLA with a sponge or wet fabric directly to the test area before it passes by a scanner.

Liquid Lead Amplification:
For low level leaks that fall below the threshold limits of either the pressure or vacuum method, this patented test uses a liquid with a low surface tension that is applied to the test area. When a small bubble forms and immediately collapses. The "bursting" produces a strong ultrasonic signal. Leak rates as low as 1x10¯⁶ ml/sec. are capable of being detected. The advantage of this method is that aside from low level leaks, gross leaks which under pressure might push the liquid aside will be detected.

Sound Isolation Enclosures:
There will be instances where surrounding ultrasounds will interfere with test results. Since ultrasound is a high frequency, short wave signal, simple test chambers or shielding techniques can be used. Enclosure barriers can be constructed with sheet metal, aluminum, fiberglass, steel plate or even wood.