flame detector; flame sensor
Technical term for a device that detects flames, used in fire safety and industrial equipment.
この工場には火炎検出器が設置されている。
Flame detectors are installed in this factory.
火炎検出器が作動して警報が鳴った。
The flame detector activated and the alarm sounded.
煙感知器 is a smoke detector, while 火炎検出器 specifically detects flames.
熱感知器 is a heat detector, whereas 火炎検出器 responds to the presence of flames.
Compound of 火炎 (flame) + 検出器 (detector). A straightforward technical term.