Ultrasonic Leak Detector

Instrument Overview

The Ultrasonic Leak Detector is an instrument used to detect the presence of ultrasound signals or to evaluate the acoustic impact. It enables several industrial applications, but it is designed mainly to satisfy the needs of the electrical industry. The needs of this industry are most demanding since the quantity of air-generated ultrasounds is very low and a very short period of time. This instrument is used mainly to identify insulation flaws or to detect the presence of pollutants on the insulators. It is very useful to prevent equipment failure or to ensure the safety of maintenance workers.

Sensors

The ULD is equipped with an ultrasound piezo-ceramic type sensor and with an amplification cone that give to the device an exceptional sensitivity. The cone enables to concentrate a larger part of the acoustic pressure on the sensor which mechanically increases the sensitivity of the instrument. It is also equipped with high-performance electronic circuits in order to amplify the electric signals without adding too much noise. The main frequency of this sensor is 40 kHz. This frequency enables a good sensitivity in the air and allows a greater sensitivity to the other frequencies. At that frequency, the ultrasound can travel a great distance with a minimum of signal reduction. This frequency enables long distance detection applications in order to respect the safety approach distances of high voltage components.

Use & Operation

The device is an instrument that transforms an ultrasound pressure into audible signals. It is a kind of frequency converter. An ultrasound acoustic vibration is converted into electric signals of the same frequency. These signals are converted into frequency by a digital converter. This function enables a human's ear to detect the presence of ultrasounds. This instrument is equipped with another cone that allows a direct output of the sound signal. An audio output enables the connection of a headset for applications in very noisy environments or for recording with a PC. The instrument is equipped with an automatic sensitivity controller. A display indicates the ultrasound level. The system automatically adjusts the necessary level of amplification to allow a good frequency conversion by the digital circuit. This amplification level will be part of the value displayed. A 6 dB variation indicates a twice greater presence and for a 20 dB, a signal 10 times stronger. It is possible with the scan button to set the current gain in order to allow a better identification in the case of very powerful sources of noise. A dot located on the right-hand side of the digital screen indicates the automatic mode when turned on and the fixed-gain mode when turned off.

Partial Discharge Application

As for partial discharges, the ionization of a flaw generates an impact in the air. These impacts of a more or less strong intensity can be identified even through a protection panel. The sound originating from this type of discharge is far different than corona effects. The sound is less repetitive than the corona effect.

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