Most storage devices that do not require vision and a brain to read data fall into this category. Electromagnetic data may be stored in either an analog data or digital data format on a variety of media.
Direct Tripwire Alarm - The wire placed across the path is directly connected with the cord, wire or string placed across the particular path. Laser Tripwire Alarm - An invisible laser, typically an infra-red, is used instead of a cord or string.
While historically copper wire has been the standard for tracer wire, a new benchmark is emerging, and Pro-Line Safety Products Pro-Trace is doing the job better and saving money. Tracer wire is also known as locating wire or locator wire because it is used to locate pipelines or pipe after it is buried. When laying PE pipe in the ground, tracer wire is buried alongside the pipe, and if the line needs repair or maintenance, an underground wire tracer or above ground wire detector can locate the non-energized pipe.