January, 2016 120-7
Model F120 UV/IR Flame Detector
User Customizable Modes
The Model F120 is a highly versatile ame detector that provides multiple modes of operation:
Triple Mode UV/IR
This mode utilizes three sensors to detect a re, one solar-blind UV sensor and two IR sensors.
The detector takes advantage of the use of these three sensors to conrm a re and reduce
false alarms and it will not be blinded by dense smoke which makes this detector superior
to other brands in the market today. It is suitable for both indoor and outdoor use and offers
increased false-alarm immunity over a UV detector.
UV Mode
This mode utilizes the solar-blind UV sensor only. It is ideal for use indoors and in areas not
susceptible to sources of false alarms. This mode provides the shortest response rate as it
will detect UV radiation instantaneously.
Dual IR Mode
This mode utilizes the two IR sensors within the detector. The two IR sensors specically
detect the IR icker of a ame and the spike in Temperature in the Hydrocarbon CO
2
band.
This combination provides a ame detector which is highly immune to false alarms.
IR Mode
This mode utilizes an IR sensor to monitor for the icker generated by a ame. It permits the
detector to ignore steady state IR sources such as hot objects.
Physical Description
The Model F120 is self-contained in a two-piece explosion-proof copper-free aluminum housing
nished in a deep red color for rapid identication as a ame detector. A protective coating
permits use in harsh environments, such as offshore platforms, without degradation. The
detector is suitable for use in “classied” areas where ignitable concentrations of ammable
gas normally exist. A sapphire window in the front of the housing permits both ultraviolet
and infrared radiation to strike the sensing elements inside. Electrical connections are made
through a 3/4 inch threaded outlet on the rear of the detector, suitable for connection to
electrical conduit or a cable gland.
Operational Description
Contained within the Model F120 Flame Detector housing are the UV, IR and heat sensing
elements and associated electronics, three (3) contact relays, and screw terminal blocks for
wiring. The detector may be installed for completely self-contained operation, utilizing the
relays to control local equipment directly. Additionally, the alarm and status conditions may
be transmitted by the detector to a central control room. The relay contacts, if not being
used for local control, may be hard-wired to the control room to transmit these conditions. Or
all conditions may be transmitted over a single wire by using the available 0-20 mA signal.
When the detector is installed and operating normally, the green LED indicator light will be
visible through the detector window. This provides a rapid visual check of detector operation
and indicates the unit is in operation. The Model F120 Flame Detector responds to a ame
with a variety of criteria and time delay settings. A multiposition selector switch sets the
detector for the most appropriate mode for the exact conditions at your particular installation.
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