Det-Tronics C7050 A, C, G, P UV Flame Detector - Manual (Page 4)

Solid Materials
— Munitions production such as illuminating flare materi-
al, TNT, and other propellants
— Powder coating booths
Other Processes
— Paint Spray booths
— Chemical and Petrochemical production
Information on these and a wide variety of applications is
available from Detector Electronics.
FEATURES
• Instantaneous response to ultraviolet radiation.
• Detectors operate under adverse weather conditions
such as wind, rain, snow, high humidity, and extremes
of temperature or pressure.
• Automatic Optical Integrity.
• Adjustable sensitivity and time delay.
• All automatic test functions performed with the system
on line.
• Manual oi test capability (in addition to Automatic oi
capability).
• Automatic fault identification.
• Individual zone identification with eight voting options.
• Microprocessor control.
• Latching ZONE LEDs identify the zone responding to
fire.
• Output circuits can be made latching or non-latching
through field adjustment.
• Individual detector output (count rate) can be mea-
sured and observed on the digital display.
• Digital display of background UV signals in Test mode.
• Digital display signal output available at field wiring
terminals for interfacing with computers or other equip-
ment.
• Detector is Factory Mutual (FM) approved, Canadian
Standards Association (CSA) cer tified, and
BASEEFA/CENELEC certified.
GENERAL APPLICATION INFORMATION
In applying any type of sensing device as a fire detector,
it is important to know of any conditions that may prevent
the device from responding to a fire, and also to know
what other sources besides fire will cause the device to
respond. A UV detector is useful in fire protection appli-
cations because it will provide very fast response to the
presence of ultraviolet radiation emitted by a flame. In
addition, it is not affected by environmental conditions
such as wind, rain, or extremes of temperature and pres-
sure. The Det-Tronics UV system is also insensitive to
the ultraviolet component of solar radiation.
Considering the above, it can be seen that there are fire
detection applications where only ultraviolet sensors are
suitable. However, success in using an ultraviolet detec-
tor is dependent not only on knowing its advantages, but
also its limitations. It is important to note that electric arc
welding is a source of intense ultraviolet radiation, and
care must be taken to ensure that arc welding is not per-
formed in protected areas without securing the system.
In addition, UV detectors should not be positioned so
that their cone of vision can scan the horizon. Rather,
they should be directed down over the designated haz-
ardous area to reduce the likelihood of picking up UV
radiation from distant sources.
An important fact regarding radiation detectors of any
type is that the radiation must reach the detectors in
order for them to respond. Care must be taken to keep
obstructions out of the line of view. For an ultraviolet
detector, this means that ultraviolet absorbing gases or
vapors as well as physical obstructions must not be
allowed to come between the detector and the protected
hazard. Smoke will absorb ultraviolet radiation, and if
accumulations of dense smoke can be expected to pre-
cede the presence of flame, then UV detectors that are
used in enclosed areas should be mounted on the wall
approximately 3 feet (1 meter) from the ceiling where the
accumulation of smoke is reduced. Glass and plexi-
glass windows also significantly attenuate UV radiation
and must not be located between the detector and a
potential flame source. If the window cannot be eliminat-
ed or the detector location changed, contact Detector
Electronics for recommendations regarding window
materials that will not attenuate UV radiation.
It must be noted that malfunctions can occur in any type
of equipment, and although Det-Tronics systems are
subjected to rigorous tests before shipment, no way has
yet been found to guarantee that every device will
always operate perfectly. The highest reliability with
regard to response to a fire is achieved when a haz-
ardous area is supervised by more than one detector,
and when each detector can independently register an
alarm.
SYSTEM DESCRIPTION
The R7404/C7050 UV detection system consists of an
R7404 Controller and up to 16 C7050 Detectors.
DETECTOR
The C7050 Detector responds to UV radiation over the
range of 1850 to 2450 angstroms. It is insensitive to
direct or reflected sunlight and to normal artificial lighting.
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