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4.2.1 Mounting Position
It is recommended that Searchzone Sonik is placed close to the area to be protected to maximise the detection performance. For best
performance, use the following location principles when determining final positioning of the detector:
• Avoid situations were a leak plume is presented directly to the face of the detector. For best results, aim the detector at the potential
leak but at an angle of approximately 30 degrees off axis of the resultant plume.
• When monitoring a pipe containing the pressurized gas, mount the detector so that it 'looks' along the pipe.
• Avoid mounting the detector directly next to or over sources of ultrasonic noise e.g. compressor, gearbox, turbine, generator, etc.
• Do not install the detector next to pressurized air lines and fittings.
• Positioning the detector away from sources of unwanted ultrasonic noise will significantly reduce the risk of nuisance alarms.
4.2.2 Mounting Angle
It is recommended that Searchzone Sonik is mounted pointing downwards by at least 30 degrees when used outdoors to allow the
sunshade to protect the sensor from the adverse environmental conditions.
4.3 Accidental Impact
Situations where there is a significant probability of equipment, personnel or moving objects accidentally impacting Searchzone Sonik
detector should be avoided. If such locations cannot be avoided, measures including increase mechanical protection and warning
notices should be considered.
4.4 Change in Site Infrastructure
When there are changes in site infrastructure or configuration, which may introduce new sources of ultrasound, the customer should
review the existing configuration of Searchzone Sonik detectors and decide if it needs to be adapted to suit those changes.
4.5 Transient Background Noise
Transient background noise from processes that release gas or steam under pressure (e.g., planned release of gas intended by the
operator) can cause unwanted triggering of an ultrasonic gas leak detector. These can be avoided by setting an alarm delay which is
longer than duration of that process operation.
4.6 Location Survey
Points of consideration:
1) Assess the Risk Case
a. What is the risk?
b. What is the anticipated gas leak sound pressure level ?
c. What is the protection method?
d. What is the detection method in case of a leak?
e. How best to mitigate the risk?
2) Assess the environmental conditions before installation
3) Assess the potential sources of background noise in the area
If necessary measure these at the proposed ultrasonic gas leak detector install position
4) Assess the area to be covered by an ultrasonic gas leak detector with respect to:
a. Type of working environment
b. Local sources of ultrasounds
5) Choose an appropriate distance of the detector from the monitored area. Avoid installing the detector at or close to maximum range
to allow higher detection thresholds to be set, reducing the risk of false false alarms. See coverage diagrams specified in Overview
and Introduction section of this manual.
PN 2331M1220 Issue 1
Searchzone Sonik − Technical Manual
4 Siting considerations
11/2018
16
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