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95-8714
6.3
INSTALLATION
IDENTIFICATION OF VAPOR(S) TO BE
DETECTED
It is necessary to identify the flammable
vapor(s) of interest at the job site in order to
determine the proper calibration gas setting for
the LS2000. In addition, the physical and fire
hazard properties of the vapor, such as vapor
density and flashpoint, should be identified and
used to assist in selecting the optimum detector
mounting locations within the area. The detector
must be installed by qualified personnel only,
following local electrical equipment installation
practices.
SYSTEM LOCATION CONSIDERATIONS
The LS2000 system is designed for installation
in hazardous industrial areas. Each module is
normally installed using a solid vertical steel
post or flat surface mounting adapter to support
the weight of the module. The modules must be
strategically located so that the hydrocarbon
vapor(s) to be detected will intersect the light
beam generated by the transmitter module.
Dispersion characteristics and behavior of
the vapor cloud resulting from a gas leak can
be difficult to estimate due to the significant
number of variables that exist at different
applications. Identification of expected gas
leakage source(s), leak scenario identification,
determination of prevailing wind direction, and
onsite leak simulation are the steps generally
recommended to provide the most accurate
means of identifying optimum system installation
locations.
In all cases, the beam path and surrounding
area should be kept free of obstructions that
could block the infrared beam or hinder the free
movement of air within the area. A clear beam
path of 20 CM diameter or greater is required.
The system is immune to the effects of exposure
to both direct and reflected sunlight.
Avoid installation in areas with obstructions
such as steam vents and plumes, smoke stacks
and chimneys, walkways and personnel areas,
splash and sprayed water, parking, loading,
cranes, vehicle-related areas such as bus stops,
road junctions, and vegetation such as trees,
shrubs, grass, etc.
Det-Tronics Field Service Engineering group
routinely provides jobsite application surveys
and analysis for customers, and their services
are highly recommended if guidance on
optimum installation locations is required.
Additional guidance on the positioning of gas
detectors for optimum coverage is contained in
BS6959 and other national codes. Consult these
codes of practice when determining where
detectors are to be located.
Consideration of the following system location
guidelines is also recommended. Routine
maintenance is recommended after abnormal
events.
Module Separation Distance
The transmitter and receiver modules must be
installed directly facing each other across the
area to be protected. Physical obstructions in
the direct line of sight between the modules are
not permitted. The overall line of sight distance
between the modules must not fall outside the
specified operating distance range (refer to
the “Specifications” section of this manual for
details).
Multiple System Installations
If multiple LS2000 systems are to be installed,
ensure that each receiver can view only the
intended transmitter. For fence line applications,
the recommended order is Tx-Rx, Rx-Tx, Tx-Rx,
etc. as shown in Figure 6.
For redundant systems, spacing between units
should be a minimum of 3 ft (1 meter) and the
receiver should be set back from the transmitter
a minimum of 12 inches (30 cm) as shown in
Figure 7.
A2692
Tx
Tx
Tx
Rx
Rx
Rx
HAZARDOUS
AREA
PREVAILING
WINDS
LIGHT INDUSTRIAL / RESIDENTIAL AREA
Figure 6—Proper Order of Modules for a
Multiple System Installation
Figure 7—LS2000 Systems in Redundant Configuration
A2696
Tx
Rx
Tx
Rx
RECEIVER SET BACK
12 INCHES (30 CM)
FROM TRANSMITTER
LS2000 SYSTEMS
SEPARATED BY MINIMUM
3 FEET (1 METER)
LATERALLY
