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.
If the smoke detector goes off, please go outside immediately.
A smoke detector is installed in this room.
A more technical term that specifically means 'smoke sensor'. Often used in engineering or product specifications.
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.
The smoke detector activated.
Specifically a small, often battery-powered device mounted on a ceiling in a home.
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.
The smoke alarm battery is about to die.