Translation guide
A device that senses smoke and issues an alarm. In Japanese, the most common term is 火災報知器, but 煙感知器 is also used in technical contexts. For everyday conversation, 火災報知器 is recommended.
Referring to a device that detects smoke and sounds an alarm, typically found in homes or buildings.
The most common and widely understood term for a smoke detector or fire alarm device. Used in everyday conversation and official contexts.
火災報知器が鳴ったら、すぐに外に出てください。
If the smoke detector goes off, please go outside immediately.
この部屋には火災報知器が設置されています。
A smoke detector is installed in this room.
A more technical term that specifically means 'smoke sensor'. Often used in engineering or product specifications.
煙感知器は煙を検知すると警報を発します。
The smoke detector issues an alarm when it detects smoke.
Less common variant; sometimes used interchangeably with 煙感知器 but may be encountered in older texts or specific contexts.
煙探知機が作動しました。
The smoke detector activated.
Specifically a small, often battery-powered device mounted on a ceiling in a home.
Official term for residential smoke alarms. Commonly shortened to 火災警報器 in everyday speech.
住宅用火災警報器の設置が義務付けられています。
Installation of residential smoke alarms is mandatory.
火災報知器 is the everyday word for a smoke detector or fire alarm. 煙感知器 is more technical and emphasizes the smoke-sensing component. In casual conversation, stick with 火災報知器.
Shortened form commonly used in daily conversation for home smoke alarms.
火災警報器の電池が切れそうです。
The smoke alarm battery is about to die.