Part Number 1460005
Revision C
III. OPERATION
Installation and Startup
Warning: The user shall be made aware that if the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
The first step in the installation process is to establish a mounting location for the SEC 5000
IR
Evolution.
Select a location that is typical of the atmosphere to be monitored or close to the anticipated source of a
dangerous gas.
It is very important that the SEC 5000
IR
Evolution be properly located to enable it to provide maximum
protection. The most effective number and placement of sensors vary depending on the conditions of the
application. When determining where to locate sensors the following factors should be considered.
What are the characteristics of the gas that is to be detected? Is it lighter or heavier than air? If it is
lighter than air the sensor should be placed above the potential gas leak. Place the sensor close to the
floor for gases that are heavier than air or for vapors resulting from flammable liquid spills. Note that air
currents can cause a gas that is heavier than air to rise. In addition, if the temperature of the gas is
hotter than ambient air or mixed with gases that are lighter than air, it could also rise.
How rapidly will the gas diffuse into the ambient air? Select a location for the sensor that is close to the
anticipated source of a gas leak.
Wind or ventilation characteristics of the immediate area must also be considered. Movement of air may
cause gas to accumulate more heavily in one area than in another. The detector should be placed in the
areas where the most concentrated accumulation of gas is anticipated. For outdoor applications with
strong wind conditions, it may require the sensors to be mounted closer together and on the down wind
side, to the anticipated area of a gas leak. Also take into consideration for indoor applications, the fact
that many ventilation systems do not operate continuously.
The sensor should be accessible for maintenance.
Excessive heat or vibration can cause premature failure of any electronic device and should be avoided
if possible.
Follow all national and local installation codes and practices
.
The SEC 5000
IR
Evolution
has a ¾” NPT threaded connector for mounting the detector to a certified
explosion proof junction box. The thread engagement shall be at least 5 full threads. Corrosion inhibiting
grease may be used if it is non-setting and as long as earthing/grounding between the certified metallic
junction box and detector is maintained.
The bonding connection on the cap of the detector must provide an effective connection for
earthing/grounding. This is done by using a conductor of at least 4 mm
2
. It is acceptable to use suitable
wiring lugs for installation if necessary.
SEC can provide a junction box with terminals for this purpose.
A conduit seal must be installed within 18” of
the detector for use of approved units..
A user-supplied junction box can be used providing it has the appropriate sized NPT conduit entries. The
junction box and terminal blocks must be suitable for use in the application and location in which it is being
installed. After the device has been installed, a calibration is required. Refer to the Calibration section of
this manual.
!
Содержание SEC 3000
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