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F-Guard IR3 H2 HD User Manual
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 alarm relay, at pre-alarm level 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.