Spectrex 20/20SI Triple IR (IR3) Flame Detector User Manual

Page 19

Spectrex Inc. - SharpEye

IR3 Flame Detector Manual – TM 20/20I, Rev. (6) August 2004

4.2.1 Optional latching
The detector includes a latched alarm output capability, which operates according
to the DIPswitch SW1-1 position. Upon the detection of a fire, the detection signal
is latched until manually reset (disconnecting the power supply or performing a
manual BIT).

4.2.2 Built-In-Test (BIT)
Successful Manual BIT will activate the following outputs according to SW1
switches.

SW 1-4 ON

The ALARM relay will be activated for 3 seconds.
The 4-20mA output will provide 15mA for 3 sec.

SW 1-5 ON & SW 1-4 ON

The ACCESSORY & ALARM relays will be
activated for 3 sec.
The 4-20mA output will provide 15mA for 3 sec.

SW 1-5 ON & SW 1-4 OFF The ACCESSORY relay will be activated for

3 sec.
The 4-20mA output will provide 10mA for 3 sec.

4.2.3 Accessory Relay as EOL
When SW1-8 is ON then the accessory relay is used as End of Line relay. In this
case, the accessory relay is active as long as the detector is not in its FAULT
state.

Note: The detectors’ status is available through its RS-485 communication link.

4.3 Mode Selection

The detector has 3 DIPswitches, which enable the user to adapt the detectors’
operation to specific applications:
• Function switch (SW1)

• Address switch (SW2) – only if using the RS-485 Serial address

• Alarm delay switch (SW3)