| 释义 |
finned-head fire detector finned-head fire detectorA nonresetting fire detector. It is made up of molded insulating material housing a pair of silver-radium electrical contacts. A fusible joint holds the contacts apart. With the rise in temperature beyond 200 to 210°C, the joint fuses and the electrical circuit is closed, illuminating the warning lamp. Modern-day fire detectors are the resetting type. |