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Model 3100 Series
Flame Detector
Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 (408) 262-6611 800-727-4377 FAX: (408) 262-9042
The Sierra Monitor Model 3100 Series Flame Detector
utilizes Ultraviolet, Infrared and Visible spectrum to pro-
vide continuous and reliable flame detection. Flame de-
tectors incorporating just IR or just UV can experience
false alarms. Even some IR/UV detectors can experience
false alarms. But the Model 3100 incorporates a unique
three spectra design. This provides the Model 3100 with
enhanced false alarm rejection. An additional benefit of
this design is the ability of the Model 3100 to detect flame
from hydrocarbon and non-hydrocarbon sources, mak-
ing it the ideal product for typical chemical/petrochemical
plants where the flame source could be from a variety of
gases.
The microprocessor in the Model 3100 is programmed
with state-of-the-art fire algorithms and continuously ana-
lyzes the data from the sensor array for individual inten-
sity values, change of intensity values, relationship of in-
tensity values, and frequency signature correlations. Each
algorithm is designed to recognize a different type of flame
signature from the detectors while rejecting common false
sources. When the conditions of any one of the several
fire algorithms are met the Model 3100 declares a fire.
When the alarm decision is made in the microprocessor,
the detector stores the pre-fire spectral data in nonvolatile
memory and outputs an alarm signal in the form of a relay
transition. The enhanced relay models also include a sec-
ond alarm relay available for alarm verification purposes.
The verification level is field selectable.
The Model 3100 is the only flame detector that provides
RS-232 access to pre-fire spectral data and diagnostic
information. Self diagnostic features of the
micro-processor continuously perform system tests,
watching for any faults which would impair its ability to
accurately detect a flame and declare an alarm. The sys-
tems being checked include input power, sensor circuits,
relay circuits and several other internal systems. The
Model 3100 also performs a through-the-lens test of the
sensor and lens systems. All faults are recorded in
non-volatile memory and may be retrieved at any time by
the operator.
The Sierra Monitor Flame Detector features 120 degree
solid cone field of view, the widest in the industry. The
Model 3100 series is in a copper-free cast aluminum
NEMA 4X rated explosion proof enclosure.
Detector Response To Various Fuels
Fuel Distance Fire Size Response Time
Heptane 80 Feet 1 Square Foot Less than 3 sec.
Silane 50 Feet 18 inch jet Less than 3 sec.
Hydrogen 15 Feet 18 inch jet Less than 5 sec.
Kerosene 75 Feet 1 Square Foot Less than 5 sec.
Field of View