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Do not use the Tone test in a complete vacuum.
Ultrasound will not travel in a vacuum. Sound waves need molecules to vibrate and conduct the signal.
There are no moveable molecules in a complete vacuum.
If a partial vacuum is to be drawn where there are still some air molecules to vibrate, then the Tone Test
may be implemented successfully.
In a laboratory, a form of the Tone Test is utilized in seal leaks of an electron beam microscope. The test
chamber has been fitted with a specially designed
transducer to emit the desired tone and a partial vacuum is created. A user then scans all seams for
sonic penetration. The Tone Test has also been effectively utilized to test tanks before they are put on
line, piping, refrigerator gaskets, caulking around doors and windows for air infiltration testing, heat ex-
changers for leaking tubes, as a Q.C. test for automobile wind noise and water leaks, on aircraft to test
for problems associated with cabin pressure leaks and glove boxes for seal integrity defects.
Optional Pipe Threaded
Tone Generator
UE-WTG2SP
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