System for detecting the application of graffiti recognizes a concentration of one or more gases or vapors linked to types of paint by using appropriate identification criteria.

摘要

Gas sensors (1) are installed on the outer walls (2) of objects to be monitored. If absolute or differential adjustable limits or constellations in concentration levels are exceeded, a system triggers an alarm mode and promptly recognizes an act (6) of graffiti. With one particular version of the system, air from intake holes (4) in a surface to be monitored is fed via intake pipes (3) to a central intake detection device (5).