Multi IR Hydrocarbon and Hydrogen Flame Detector User Guide
30
Internal Detector Tests
3
The detector will remain in BIT Fault state until it has passed a
successful BIT.
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.
Optional Latching
1.5.6.1
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
on page 33).
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, and
3XXXX
1.5.7 Auxiliary Relay as End-of-Line
The auxiliary relay can be used as End-of-Line in models with suffix
–
4XXXX
and 5XXXX only. In this case, the auxiliary relay is active as long as the
detector is powered.
1.6
Internal Detector Tests
The detector performs 2 types of self-tests:
Continuous Feature Test, page 30
Built-In-Test (BIT), page 31
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 levels
Voltage level status of sensor and sensor circuitry for noise or
disconnection in the electronic circuitry
0
–
20mA level output
