Page 19 of 97
Title FireVu Detector Standalone Installation Manual
NetVu Ltd.
No 1 Thellow Heath Park, Northwich Road, Northwich, Cheshire. CW9 6JB
When positioning detectors ensure that items or fixings mounted or positioned nearby do not
unnecessarily come into the detectors view. For example, if mounted beside an air conditioning
unit the detector may need to be bought forward so as to not see the side of that unit “up close”.
Avoiding problematic areas wherever possible
This can be done with careful placement of the “detection regions” as well as using the “Exclusion
masking” feature in the FireVu dashboard configuration tool. However, it is worth considering
these issues at least in part when positioning the detectors.
In cases where these aspects cannot be avoided from being within the detector’s field of view, but
do not need to be monitored, then we can ignore them by arranging the analysed regions so as
not to cover those parts. In cases where the problem area is small or irregularly shaped we can
exclude it using the manual fixed “exclusion mask” feature within the FireVu dashboard
configuration tool.
Lighting
Areas of the view where there will be significant changes in light during the course of the day or
year can be difficult to configure to see smoke in the differing conditions and not false alarm with
the changes in those conditions, if those changes result in such a variety of lighting within a single
detector view that in order to accommodate the darker areas the brightest areas saturate the
detector’s sensor.
The easiest way to ensure a stable and reliable configuration which will work well all day long and
year-
round is to avoid having certain areas within the “detection regions”.
Examples of these are:
●
External detectors which point due east or west as the sun will come into view at either dusk
or dawn.
●
External doors and windows which may be left open allowing light to stream in, both the
opening itself and the area onto which light will shine should be considered.
●
Roller shutter or hanger doors; where possible detectors should be positioned to be looking
into the building rather than internally looking towards the doors which would result in
looking out of the building in periods when those doors are opened.
Artificial lighting, including IR.
If 24-
hour operation of the VSD system is required, the detectors will need to be able to “see” at all
times. Consequently, the monitored areas must be lit either by leaving sufficient lights on or fitting
IR lighting specifically for the purpose. When fitting either the lighting or the detectors, (subject to
which came first or other restrictions), care should be taken so as to avoid any detector looking
directly into any of the lighting.
Note:
NetVu Ltd. recommend the use of 850nm IR flood lighting with 60 degree spread of light to
