探知

1. Origins, structure, and basic meaning

• Structure: 探知, read たんち, means detecting the presence of a hidden condition or signal with a device or sensor.
• Basic usage: It applies when equipment senses a leak beneath a floor or detects smoke and triggers an alarm.

2. Common pitfalls and similar expressions

• Detection by a sensing device
  • It describes a device sensing a leak or smoke and triggering an alarm. The focus is detecting a signal rather than investigating until its cause is established.