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world conditions. The sound pressure level generated by a high pressure gas leak is dependent upon the pressure, the leak diameter, and
upon the gas density. The Searchzone Sonik detector is designed to detect hazardous high pressure leaks.
As a guide, the following table indicates typical maximum detection ranges that can be achieved for various levels of background
ultrasonic noise.
Detection Threshold Level
Standard Detection Mode
Focus Detection Mode
Note
Due to variances sound level intensity generated across the measured frequency range and angular positioning of the detector.
The above values may vary up to 50%.
The values in the table above were achieved with a methane leak, mass flow rate of 0.1 kg/s at an environment of 20°C, 50 %RH and a
standard atmospheric pressure of 1013 hPA.
Note
The Background Levels feature, available in the Searchzone Sonik mobile App, can be used to validate and check that the current
detector settings are appropriate. Refer to section 9.9 Detector Settings for more information.
3.6 Range and Field of Coverage
The Searchzone Sonik detector has a dynamic range of 40dB to 140 dB giving a detection range of typically 20m on-axis radius
(background noise dependant). The field of detection coverage (FoC) is +/-90 degrees in both horizontal and vertical planes measured
on-axis to the face of the detector's sensor.
The detection algorithms (Standard or Focus) differentiate between leak signatures and typical noise source signatures in both time and
frequency domains. The polar plots in the Figures 3 and 4 below show the typical detection areas for both Standard and Focus modes.
Refer to the table in section 3.5.1 for typical ranges that can be achieved for both Standard Mode and Focus Mode.
3.6.1 Standard Mode
Use Standard Mode for larger areas which are subject to lower levels of background noise and where nuisance alarms sources are not
expected.
PN 2331M1220 Issue 1
64 dB (Low)
74 dB (Mid)
24 m
12 m
7 m
5 m
Figure 3. Angular Field of Coverage in
Standard Mode (% of Range)
Searchzone Sonik − Technical Manual
3 Overview and Introduction
84 dB (High)
7 m
3 m
11
11/2018
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