All UE Systems Tone Generators produce a patented Warble Tone. This particular warble signal is easy to locate and eliminates the potential of false leak indications due to “standing waves” in which pure tone harmonics may stimulate a vibration at a point other than the actual leak.

Some Typical Applications for the Ultratone Test

Heat Exchangers

When the heat exchanger is off line, the Ultratone Test is an ideal method for locating faulty tubes. The shell side of the heat exchanger is flooded with a uniform ultrasound. Usually the access to the shell side requires the use of UE Systems WTG-2SP Pipe Tone generator. The tone generators are placed in flange fittings or access ports to surround the tube bundle with uniform ultrasound.

The generated ultrasound will reflect off solid tubes but will vibrate areas of extreme thinning and penetrate leaks along faulty tubes. A faulty tube will have a distinctly different sound quality and intensity level than a solid, intact tube. By scanning along the tube sheet the telltale signal will be heard and the faulty tube quickly located. Poor rolls in the tube sheet can also be detected.


Often problems with cabin pressure, cockpit window noise or fuel cell leaks are difficult to locate when the aircraft is on the ground. Using the UFMTG-1991 Tone Generator to flood a section of the cabin, cockpit or fuel cell, the generated sound will deflect off solid seals but will follow the path of least resistance through a leak hole. Scanning on the opposite side with an Ultraprobe will indicate the leak signal and locate the exact leak site.

This test is fast and accurate.

There is no need for any excessive preparation of the leak site. Once a repair is performed, a fast re-check will assure the job has been performed correctly.


Water tightness integrity testing of compartments and bulkheads can be extremely time consuming using the standard bubble/ pressure method. Depending on the size of the compartment, one or multiple UFMTG-1991 Multi-directional Ultrasonic Tone Generators are placed strategically to provide a uniform ultrasound in the test area. By scanning on the opposite side, the leak signal will be detected and the exact location of the leak will be determined. The speed of the test assures reduced manhours, increased accuracy and provides for a quick re-test of the repair.

Hatches may also be inspected quickly and conveniently. The UFMTG-1991 Tone Generator may be suction cup mounted to the underside of a hatch and in some instances, the standard WTG-1 Warble Ultrasonic Tone Generator may be placed in the hatch area to provide a uniform ultrasonic signal around the hatch seal. Scanning on the topside with an Ultraprobe will indicate sonic penetration and the leak site. What’s more, it is possible to establish repeatable inspection procedures to meet the requirements of private insurance or agency codes.

Rail and Truck Hatch Testing

To prevent potential environmental spills through leaking hatches during transportation, it is often possible to inspect for leakage of the “nitrogen blanket” by simply scanning with an Ultraprobe. However, there are instances where this may not be possible, or a “blanket” is not used. The hatch area may be inspected using a WTG- 2SP affixed to a bleed or vent pipe or by placing a tone generator in the hatch, performing the test and then removing the tone generator.

In either case, the generated ultrasound will not penetrate a solid hatch seal, but will follow the path of least resistance through a leak site. Scanning the hatch with an Ultraprobe will indicate the exact location of a leak providing for a quick repair and re-test. For extremely corrosive environments, UE Systems provides a special version of the tone generator, the model WTG-2SPIS.


Wind noise and water leaks are easily tested with the UFMTG-1991. The convenient suction cup mount enables users to place the tone generator on the windshield.

Close the doors, and test for sonic penetration. Pre established intensity levels at specific test points can provide accept-reject criteria for fast, repeatable quality control inspections. Using a WTG-1 in the trunk can help locate water leaks and eliminate the need to having someone crawl into these tight areas.

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