General Monitors FL3112, Руководство пользователя

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Model FL3112
2
1.2 Principle of Operation
IR Flame Detector
The Model FL3112 is a discriminating Digital Frequency Infra-Red Detector which makes
use of infrared detectors of different IR wavelengths and characteristics. This combination
provides a flame detection system which is highly immune to false alarms.
Incorporated in the IR circuitry is a flicker discrimination circuit. This permits the detector to
ignore steady state IR sources such as hot objects. The inherent flickering of a flame
provides the necessary modulation to activate the IR circuit.
The Model FL3112 Flame Detector processes these IR signals with a microcomputer and,
depending on the version, produces the following outputs:
•
0 to 20 milliampere signal.
•
Immediate WARN relay contacts.
•
Time delayed ALARM relay contacts.
•
FAULT relay contacts.
•
RS-485 MODBUS RTU serial communications ports.
(See Sections 2 & 3 for more information on detector outputs)