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23
F-Guard UV-IR-HD User Manual
76-M-6010-02-02
Enable dirty window warning 0-20mA
If enabled, this feature assists predictive maintenance by indicating an alert when the BIT signal is
reduced by 75% of the value needed to trigger a BIT fault failure. When activated, the milliampere
output will drop to 3mA and the LED will remain steady green, it should be noted that a fire signal
will override the dirty window warning. A process variable of optical contamination (BIT signal level)
is accessible via HART and / or MODBUS. The value of the field ranges from 0 (clean) to 100% (BIT
fault).
Auxiliary Relay
The Aux relay can be set to operate in parallel to the alarm relay, at pre-alarm level, when high IR or
high UV energy is present or on “dirty window warning.
Window Heater
The detector is equipped with a heater to prevent condensation and icing on the window. If enabled,
the heater is operated automatically depending on temperature.
Video Settings
The detector is equipped with a video camera and processing module. If enabled (“Video module”
setting) the detector provides video outputs and records flame alarm events. The events are
recorded from 1 minute before the flame was detected to 1, 2 or 3 minutes after (depending on the
“post alarm video recording duration” setting).
Digital video output is provided via ethernet and ONVIF Profile S protocol. Composite (analog) video
output is provided in NTSC or PAL format, depending on the “Video analog output” setting
Modbus Address
The detector can communicate with the
Gastech
communicator software using a Modbus RTU
compatible protocol on RS-485. This protocol allows for a network of detectors to be connected,
each with a unique Modbus address. The address of the detector can be set to any value in the range
1–247.
Manual BIT – Alarm Output Test (Full loop test)
When enabled, the alarm outputs are activated when a Manual BIT is initiated. See section 4.2 for
details.
WARNING
Make sure all fire extinguishing actions or alarms connected to the detector are DISABLED when
the manual BIT is initiated and the “Manual BIT – Alarm Output Test” is enabled as the Manual BIT
will set the 0-20mA terminal to 20mA and close the alarm relay and auxiliary relay if configured.