[quickthrowman]

> It also raises questions like "if the sensor is reporting 400C then either the building is on fire or the sensor is broken", or "how do we get the alert if the building is indeed on fire" and the inevitable followup: do we even need to get an alert if the building is on literal fire?

Haha, I was looking at a BAS front end with a customer and we were trying to figure out why an air handler kept tripping out. The return air duct static pressure sensor was reading 65536 kpa, so either the sensor was faulty or the building was moments away from being vaporized in a massive explosion. Replacing the sensor corrected the issue and hundreds of lives were saved ;)