Page 73 of 97
Title FireVu Detector Standalone Installation Manual
NetVu Ltd.
No 1 Thellow Heath Park, Northwich Road, Northwich, Cheshire. CW9 6JB
Low Contrast Trouble/Fault Indication
One of the methods by which FireVu’s intelligent algorithms determine the presence of smoke is
through a reduction in contrast within the monitored view.
As a result, for this method to be effective there needs to be a detectable amount of contrast
within the detector view that can be measured. To assist in ensuring this is the case the FireVu
detector is capable of providing a trouble or fault indication when there is insufficient contrast.
This warning is turned on by default, but by default will only provide a visual indication of areas of
insufficient contrast when the detector’s signal is viewed in NetVu Limited’s Enterprise Observer
viewing software.
Any region (monitored area of the detectors view) which contains insufficient contrast will become
highlighted grey as a trouble/fault indication.
This can be used in one of two ways:
●
A visual indication that areas within the field of view have very little or no detectable
contrast.
●
By enabling the “Inhibit alarm” option for the required regions within the “Fault Warnin
”
Web-
page under the “FireVu Dashboard” section of Web
-pages (see previous section in this
manual), you can generate an output from the FireVu detector if or when any region loses
its contrast.
The second option listed above will create a system alarm when an area of the monitored view
which usually has sufficient contrast for effective detection reduces in contrast. This will draw the
user’s attention to excessively dirty detectors or detectors that have gone out of focus, as either of
these situations will erode the measurable contrast.
Focus Trouble and Detector Masking Indication
In addition to fault indications, the FireVu detector can be configured to provide an output if its
image becomes unusable as a result of being masked (obscured). This could be as a result of the
detector’s view going out of focus, an excessive dirt build
-up on the detector housing, or if a
detector is deliberately covered over or closely blocked following some form of site activity.
By default, the detector masking detection is turned on and the instructions below can be followed.
However, if the feature is ever turned off, then to turn it on again there is a tick box labelled
“Camera Masking” in the web
-
page menu structure (“Configuration” then “System” then
“Features”). On
ce turned on, the unit will ask to be reset. This reset has to be performed to enable
the detector masking feature and make visible its configuration menu.
Following a reset, a “Masked Cam Detect” page will become visible within the unit’s web
-pages.
Thi
s will appear under: “Configuration”, “Alarm” then “Masked Cam Det”, see image below:
