Instruction Manual
Page: 2
Model 3100 Series Flame Detector (11/04)
2. OPERATION
2.1 General
When the Model 3100 Flame Detector is powered
up, the microprocessor checks the configuration
switch settings and configures the detector. The mi-
croprocessor then runs a full series of self tests.
After the self test process is complete and all tests
are passed, the detector is ready to detect a fire.
All modes of operation are indicated by two LEDs
located on the front of the detector. Normal Mode
is indicated by a brief flash of the LEDs every 8
seconds. With the device in Normal Mode it is
constantly monitoring the environment and ready
to detect a fire.
When a fire is detected the flame detector will acti-
vate the Fire Relay and turn on both LEDs. If the
device is configured for “Latching” Mode the de-
vice will remain in Alarm Mode until power is re-
moved. In “Fire Following” Mode the Fire Relay
will reset when the Fire Probability Algorithm de-
termines there is no longer a fire.
The self test system is continuously monitoring the
internal systems. When a fault is detected the Fault
Relay is de-energized. In Fault Mode the LEDs
will flash a code indicating the type of fault. A fault
indication may mean the device is unable to detect
a fire or that a device has become unreliable. (i.e. a
“Voltage Low” fault) For most faults the detector
will return to Normal Mode when the fault condi-
tion is corrected.
The Model 3100 Series comes in several versions.
The basic version 3100-01 does not have the Verify
or the Auxiliary Relay systems. The enhanced Mod-
els 3100-02, -03, -04 and -05 have the Verify and
Auxiliary Relay systems. These versions represent
the different configurations (Normally Open or
Closed contacts) of the Verify and Auxiliary Relays.
The Auxiliary Relay provides a separate relay out-
put for the Lens Test Fault. The Verify system is
activated when a fire is declared. A Verified Fire is
declared when the conditions of the Verify Fire Al-
gorithm are met. All other functions are the same
as the basic Model 3100-01.
The 3100-06 does not have relay outputs. It uses a
4-20 mA current circuit. The detector's status de-
termines the amount of current flow through the
circuit.
Figure 2-1: Model 3100 Series Field of View
