Det-Tronics UD20 FlexVu Explosion-Proof Universal Display Unit - Manual (Page 5)

3.1 95-8620 3
importAnt sAfety notes
CaUtIon
The wiring procedures in this manual are intended
to ensure proper functioning of the device 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 device contains no user serviceable
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
Display 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
device is used in a manner not conforming to its
intended use.
CaUtIon
Observe precautions for handling electrostatic
sensitive devices.
CaUtIon
Unused entries must be closed with suitably
certified blanking elements upon installation.
instAllAtion
NOTE
The UD20 housing must be electrically connected
to earth ground. A dedicated earth ground
terminal is provided on the UD20.
Install gas detectors in the appropriate locations
following the guidelines below. The UD20 should be
located where it can be easily viewed by personnel. The
GT3000 can be attached directly to the UD20 housing,
or it can be mounted remotely using a Det-Tronics STB
termination box (see “Sensor Separation” for additional
information). Detectors must always be installed per
local installation practices.
Always define the following application details:
IDENTIfICATION Of vApOR(S) TO bE DETECTED
It is necessary to always identify the vapor(s) of interest
at the job site. In addition, the fire hazard properties
of the vapor, such as vapor density, flashpoint, and
vapor pressure should be identified and used to assist
in selecting the optimum detector mounting location
within the area.
IDENTIfICATION Of DETECTOR mOUNTINg
lOCATIONS
Identification of the most likely leak sources and
leak accumulation areas is typically the first step in
identifying the best detector mounting locations. In
addition, identification of air current / wind patterns
within the protected area is useful in predicting gas leak
dispersion behavior. This information should be used
to identify optimum sensor installation points.
If the vapor of interest is lighter than air, place the sensor
above the potential gas leak. Place the sensor close to
the floor for gases that are heavier than air. Note that air
currents may cause a gas that is slightly heavier than
air to rise under some conditions. Heated gases may
also exhibit the same phenomenon.
The most effective number and placement of detectors
varies depending on the conditions at the job site. The
individual designing the installation must often rely on
experience and common sense to determine the detector
quantity and best locations to adequately protect the
area. Note that it is typically advantageous to locate
detectors where they are accessible for maintenance.
Locations near excessive heat or vibration sources
should be avoided if possible.
Final suitability of possible gas detector locations
should be verified by a job site survey.