Version: 20210708
36
Technical specification
Functional specification
Type:
Smoke Detection
•
Detects smoke clouds.
Flame detection
•
Detects flames based on colour, brightness, and motion.
Event types:
Araani Fire Guard can generate following mutual exclusive events:
•
ALARM = smoke or flame detected.
•
FAULT SIGNAL = invalid light conditions; only smoke is not working.
•
OPERATIONAL SIGNAL = normal condition.
Reliability check:
Araani Fire Guard has built-in self-monitoring functionality and will generate
a FAULT SIGNAL in following cases:
•
Image quality degradation to a point where detection is at danger.
•
Scene is too dark
–
only an issue for the smoke detection.
Easy set of parameters:
•
Alarm delay.
•
Sensitivity level.
System requirements
Camera compatibility:
Araani Fire Guard is only compatible with Axis
cameras:
•
Single-sensor visual camera.
•
Fixed camera, not a PTZ.
•
Artpec-6 or Artpec-7 chipset.
•
Aspect ratio 16:9 or 9:16.
Minimum contrast in the field of
view:
Araani Fire Guard
requires “enough” basic contrast in the background
scene.
In realistic situations, this constraint is usually fulfilled.
In case there is a lack of contrast, Araani Fire Guard will raise a Fault
Signal.
Minimum ambient light level:
5 lux or more is required for smoke recognition 24/7 over the whole field of
view. However, each camera type has a different sensitivity to low light, so
this minimum light level is camera dependent and it can be necessary to
have a higher light level. Araani Fire Guard will raise a FAULT SIGNAL if the
scene appears too dark on the video.
No light is required for flame recognition.
