I know V4 is out of date, and in fact, we had some serious issues in the past with rules being randomly deactivated after a reboot, something we were told was a known problem, and the solution was to upgrade to V5... at a cost. Somehow I couldn't bring myself to approach the client with the news that the only fix for their uber-expensive high-tech system was to pay even more to address a know bug. My workaround ended up being a startup script that would email me anytime the machine rebooted, so I could remote in and make sure the rules were all set.
Be that as it may, like I said, I have no qualms with setting it to detect vehicles in the yard, since the procedure has the operators contacting the monitoring station before entering, and anytime a vehicle comes in, eventually a person will appear to trigger it anyway. I'm just skeptical that the system would see a fire and a vehicle the same way, as the heat bloom is HUGE on the FLIR.
As an example, this is how the FLIR normally sees a running vehicle, along with a forklift and a couple people:
This is the truck that burned, pre-fire, for comparison:
This is what the fire looked like from a panning PTZ on the opposite side of the yard (a little glare above on the dome bubble, the fire itself appears relatively small):
And this is how it looked to the FLIR at that same instant:
Playing back the video at high speed, there's actually a very small flickering heat signature there for quite a while before it flares up, and when it does, there's a very brief instance where the bloom is about the same size and shape as a vehicle, maybe four or five frames (under 2s)... and then it's way beyond that.
The fire actually passes through a brief phase where it's about the size of a person, but it doesn't show as being as hot as a person, and apparently the system is smart enough to recognize that it ISN'T a person, and so doesn't trigger an alert.
Anywho... I'm just thinking out loud at this point... I'm skeptical of how well this could work, and of course, testing it will be kinda tricky, as I'm sure they don't want us to burn any more trucks... all I can think of is to have a guy stand in the yard behind an object, so he's not picked up, and set off a highway flare. Any help is appreciated, though... we should be talking to the client a little later this morning to see how they want to proceed.