Spectrex Inc. - SharpEye
TM
Single IR Flame Detector Manual – TM 20/20R, Rev. A January2005
9
4.2 Output Signals
The detector controls the following outputs:
•
Alarm relay
•
Accessory relay
•
Fault relay
•
4-20mA current output
•
RS-485 communication
The detector can be in one of the following states.
Normal:
The detector is functioning normally.
BIT:
The detector performs a Built-In-Test.
Warning:
Fire detected - changed to warning – pre-alarm state.
Alarm:
Fire detected - changed to fire alarm state.
Latched Alarm
(Optional)
The alarm outputs are latched due to the detection of a fire that
has already been extinguished.
Fault:
A fault is detected during a BIT sequence or the power supply is
too low. In each state the detector will activate different outputs
as specified in table 5.
Table 4: Output Sign als Versus Detector State
Detector
State
SW1
Power
Led
Alarm
Led
Alarm
Relay
Accessory
Relay
Fault
Relay
4-20mA
Output
Normal
On
Off
Off
Off
On
5mA
Warning
Sw1-2 ON On
Flash
2Hz
Off
On
On
10mA
Alarm
On
On
On
On
On
15mA
Latch
Sw1-1 ON On
Off
On
Off
On
5mA
Fault
Flash
4Hz
Off
Off
Off
Off
0mA
•
The detector will be in its FAULT state until it has passed a successful BIT.
•
When SW1-2 is OFF, WARNING state is the same as the ALARM state.
•
The alarm outputs will be activated as long as the alarm conditions are present
and will stop approximately 5 seconds after the fire is no longer detected.
Summary of Contents for SharpEye 20/20R
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