HF500R sensor has been designed for perimetric site protection. It is particularly suitable for protection of large area sites such as airports, military installations, industrial sites, water intake areas, storage areas and state borders. Its principle of operation is detection and analysis of intrusion provoked distortions of electromagnetic field generated by a transmitting cable
and received by a parallel sensory cable. Both cables are placed on the perimeter of the protected area up to 40 cm below ground, separated by a distance of 0.9 – 2.0 m and generate an invisible, spatial detection zone. Its trespassing by an intruder is detected, localized and triggers an alarm. The HF500R system uses special coaxial cables which are designed to emit outside electromagnetic field. These are so called “leaky cables”. Contrary to other commercial perimetric protection systems which use special dedicated sensor cables with fixed lengths, the HF500R sensor uses standard universally employed leaky cables. These cables are offered in lengths of 500 m, on standard spools and can be deployed easily on installation site and cut into required lengths. A single HF500R sensor module can protect one segment of a perimetric protection system up to 500 m, achieving intruder localization resolution not worse than 3 m.
Contrary to surface and fence-mounted systems, an active HF500R system is completely invisible. Because of low level signal emitted by the transmitting cable, the detection of a HF500R system through radio frequency bands scanning is difficult and subsurface sensor installation naturally enhances its resistance to accidental damages and tamper attempts. System cable damages do not require its replacement and can be easily on-site repaired.
Depending on its version, the HF500R sensor can be operated in two topologies: stand-alone or networked. In the stand-alone topology, the HF500R sensor controls one segment of sensor cables of a total length up to 500 m, which forms 166 detection sections of 3 m length each. These sections can be freely defined into maximally 4 independent alarm zones with programmable relay outputs, which can be connected to a standard alarm control unit. This enables creation of deactivated exit/passage zones and enhances the precision of intrusion localization in the protected area. In this topology, the HF500R sensor can be used to protect small sites, such as water intake areas, radio relay stations, storage areas, residences etc..
In networked topology, the HF500R sensors can be operated autonomously or in big networks, creating perimetric protection systems of many kilometers of total length. For operation in this mode, used to protect airport perimeters, military storage sites, industrial and logistic complexes, the manufacturer supplies on request double sensor units of the HF500RS version which enable creation of protection segments of up to 1000 m of total length. The HF500RS units can be networked using RS485 interfaces, which are integrated into every control unit. For very big security systems, the HF500RS units can be equipped with a fiber-optic converter, enabling the sensor to support fiber-optic communications networks in ring and star topologies of up to 20 km of total length. Employing fiber-optic networks ensures galvanic separation of devices which enhances the system’s reliability in a context of atmospheric electrical discharges, occurring frequently in Central Europe. Network connections can be implemented using standard copper and fiber-optic cables and standard components used to build communications network. Moreover the HF500R system employing fiber-optic networks offers users additional functionality such as central control communications and CCTV cameras image streaming. Thus the reliability of the system is improved and the costs of its installation and operation are decreased. If the access to an IP fiber-optic network is impossible on the HF500R sensor’s installation site, the manufacturer supplies necessary fiber-optic cable together with sensor cables. In this case, the fiber-optic cable is laid together with a sensor cable (transmitting or receiving) without any effect on the sensor’s operation.
