Det-Tronics ATX10 Transmitter - Manual (Page 15)

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DETECTION COvERAGE
The FlexSonic Acoustic Detector is an omni-directional
acoustic analyzer that can recognize the unique
frequency content of events such as gas leaks. The
high-frequency sound energy generated by pressurized
gas escaping is dependent upon several factors such
as gas pressure, geometry of the leak opening, gas
viscosity, as well as environmental conditions such as
temperature and humidity.
It is recommended that the detector be mounted
above the potential leak sources in the coverage area
to minimize attenuation of acoustic signal from the
detector housing itself. Also, care should be taken to
eliminate acoustic blind spots caused by equipment,
scaffolding, etc. that lie between the detector and
potential leak sources.
Background noise can also diminish the effective
coverage area, however, the patented Learn function
allows the FlexSonic Acoustic Detector to ignore many
sources of high frequency sound energy without
negatively impacting detection range (e.g. moving
the detector, or raising the alarm threshold level). For
best performance, it is recommended that the acoustic
environment where the detector is to be placed be
captured with either the onboard learn function or
data logging capabilities of the FlexSonic Acoustic
Detector. The acoustic profile generated can be used
to very accurately display the exact content/sources of
background noise, and optimize the alarm threshold
setting. Refer to the Data Management and Profile
Mode sections of this manual for additional information
on alarm settings.
Detection range will vary depending upon the leak
rate, environment, and installation factors described.
Reference detection ranges for the FlexSonic Acoustic
Detector are provided below (detector mounted 2
meters above ground pointing vertically downwards,
and low ambient background noise > 20 kHz):
leak Source:
Leak Rate:
0.004 Kg/Sec
Gas Type: Compressed Air
Gas Pressure: 6 Bar (87 psi)
Leak Orifice: 2 mm round
Orientation: Straight up
Detection coverage is specified as a radius with the leak
source at or below detector level, and unobstructed by
infrastructure.
Basic Mode, 50 dB setting =
12 meter radius (40 feet)
Profile Mode (4 dB above background) =
20 meter radius (66 feet)
For information regarding installation of the FlexSonic
Acoustic Detector in a specific application, please
contact the Det-Tronics factory.
= PROFILE MODE
= BASIC MODE
3m
6m
9m
12m
15m
18m
21m
A2611
Coverage Range of FlexSonic Acoustic Detector (low level leak)