Det-Tronics OPECL Infrared Hydrocarbon Gas Detector - Manual (Page 11)

9 95-8556 10.1
impoRtant SafEty notES
CaUtIon
The wiring procedures in this manual are intended
to ensure proper functioning of the system under
normal conditions. However, because of the
many variations in wiring codes and regulations,
total compliance to these ordinances cannot be
guaranteed. Be certain that all wiring complies
with the neC as well as all local ordinances. If
in doubt, consult the authority having jurisdiction
before wiring the system. Installation must be
done by a properly trained person.
CaUtIon
This product has been tested and approved
for use in hazardous areas. However, it must
be properly installed and used only under the
conditions specified within this manual and
the specific approval certificates. Any device
modification, improper installation, or use in a faulty
or incomplete configuration will render warranty
and product certifications invalid.
CaUtIon
The system contains no user serviceable internal
components. Service or repair should never be
attempted by the user. Device repair should be
performed only by the manufacturer or trained
service personnel.
LIabILItIes
The manufacturer’s warranty for this product is
void, and all liability for proper function of the
system is irrevocably transferred to the owner or
operator in the event that the device is serviced or
repaired by personnel not employed or authorized
by Detector electronics Corporation, or if the
system is used in a manner not conforming to its
intended use.
CaUtIon
observe precautions for handling electrostatic
sensitive devices.
noTe
The open Path eclipse is intended for detection
of hydrocarbon vapors only. The device will not
detect hydrogen gas.
noTe
The terminal compartment for oPeCL without
relays is designed for either an increased safety
“e” termination or a flameproof “d” termination of
the supply cable. If a flameproof connection is
chosen, then an ATeX certified cable entry device
must be used. The oPeCL with relays requires ex
d cable entry devices only.
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 OPECL. 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 OPECL 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,
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.