Wiktionary
n. A device that detects heat and sounds an alarm.
Wikipedia
A 'heat detector is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The thermal mass and conductivity of the element regulate the rate flow of heat into the element. All heat detectors have this thermal lag. Heat detectors have two main classifications of operation, "rate-of-rise" and "fixed temperature." The Heat detector is used to help in the reduction of damaged property. It is triggered when temperature increases.
Usage examples of "heat detector".
And the body-heat detector shows he was in the chair in front of the computer as of five to ten minutes ago.
The heat detector on his rifle had the Darhel more or less pinpointed so he let loose a hornet round and got the hell out of dodge, keeping those rocks between them as a punch gun poounked behind him.
A smoke detector and a heat detector had been Installed In the shadowy upper reaches of the ceiling, where I could see sprinkler heads as well.
A smoke detector and a heat detector had been installed in the shadowy upper reaches of the ceiling, where I could see sprinkler heads as well.
If we have to turn on the lights now and then to keep from getting swallowed up in a hole and some surveillance plane spots us or some heat detector locates us, at worst they'll warn us to get out.