Sensor for security fence

摘要

A security fence consists of tension barbed wire strands strung between posts embedded in the ground. Located against the main posts are sensor posts of extruded metal providing a location for sensors (70) positioned near the base. - Each sensor has a main hollow section body (40) with a flexible outer sleeve (42) of elastomer body is a pillar providing in connection to an electrical contact. The pillar reduces in cross-section and is separated from a second contact by a thin-walled elastomer section. Any delfection of the fence post establishes a connection between contacts to trigger an alarm.