Search

Ultrasonic Inspection: Vacuum Systems

Ultrasonic Testing

Like any air or gas system, the CTRL UL101 is able to detect leaks in vacuum systems regardless of the type of gas. The UL101's high sensitivity, selectivity, and signal-to-noise ratio helps to distinguish leaks in the harshest environments. In many cases, leaks can be detected as low as 20 Torr (12mbar). Furthermore, the UL101 is extremely capable of reproducing ultrasonic signals so they are familiar, and a vacuum leak sounds just like an air leak.

It is necessary to start by adjusting the UL101's sensitivity at the highest setting on the potentiometer. Use the concentrator attachments or acoustic extension probes for shielding ambient ultrasound and directing the area of reception. Vacuum leaks are not very intense and produce very little ultrasound. It is often necessary to survey a vacuum system from only a few feet away. The PowerBeam 300 can be used to detect ultrasound up to 300 feet away, so it is suggested to use the PowerBeam 300 for the detection of vacuum leaks when you are more than 3 or 4 feet away.

When performing a routine survey, start from the pump and work outward along the air/gas lines. If a leak is found, adjust the sensitivity of the UL101 down and move closer to the source. The leak can be pinpointed within 1/4", tagged, and fixed at a convenient time. The UL101 can then be used to verify that repairs were done properly and leaks no longer exist in the system.

<< Prev: Types of Vacuum Systems || Next: Case Studies>>