| 摘要 |
<p>" " A fire detector for use in a fire protection system comprises a tube of heat-conductive material extending through a zone to be protected by the system. The tube houses a temperature-responsive element comprising a length of a gas-evolving substance, operative when a predetermined critical temperature is reached at any point along the length of the tube, to explosively generate a volume of gas for activating pneumatic actuation means for example associated with a fire extinguisher of the system. The length of gas evolving substance is within a wire mesh sheath which acts as a filter to retain combustion products and unburnt residue from the substance after activation. The sheath avoids the need for thorough cleaning of the system when re-commissioning after activation and also facilitates the insertion of a fresh element into the system.</p> |
