Spectrex 40/40L-LB UV/IR Flame Detector Series - Manual (Page 27)

TM 40/40L, Rev (6) February 2013
Internal Detector Tests 15
4 The Auxiliary Relay can be activated at the Warning level or Alarm level,
depending on programmed function.
5 The outputs depend on the wiring options.
1.5.6.1 Optional Latching
Alarms are set as non-latching by default. However, the detector includes a
latched alarm output capability, which operates according to the
programmed function.
If selected, upon detection of a fire, the detection signal is latched until a
manual reset is performed (disconnecting the power supply or performing a
manual BIT (see Manual BIT on page 17).
Latching affects the Alarm Relay, 0-20mA output, the Alarm LED (the
Auxiliary Relay will be latched only when the programmable function
Auxiliary Relay is set to YES.
Notes:
 The Auxiliary Relay is available only in Models with suffix – 4XXXX and
5XXXX
 The 0-20mA is available only in Models with suffix – 1XXXX, 2XXXX,
3XXXX
1.5.7 Auxiliary Relay as End-of-Line Resistor
The Auxiliary Relay can be used as End-of-Line (EOL) resistance in Models
with suffix-4XXXX, and 5XXXX only. In this case, the Auxiliary Relay is
active as long as the detector is not in Fault state.
1.6 Internal Detector Tests
The detector performs two types of self-tests:
 Continuous Feature Test, page 15
 Built-In-Test (BIT), page 16
1.6.1 Continuous Feature Test
During normal operation, the detector tests itself continuously and indicates
a fault if a failure is found. This type of test complies with SIL-2
requirements.
The detector continuously tests:
 Input voltage level
 All internal regulator voltage level
 Voltage level status of sensor and sensor circuitry for noise or
disconnection in the electronic circuitry
 0-20mA level output
 Relays and heater operation