June 2019 AST Magazine June 2019 AST Magazine

www.AmericanSecurityToday.com Detection at the perimeter enables the security system to respond while the intruder is still outside the protected area by calling up cameras and engaging deterrence devices like security lights and sirens. Block vs Ranging Sensors Based on the granularity of alarm infor- mation presented to the security system, fence-mounted sensors can be divided into two categories: block and ranging. • Block sensors – Each sensor functions as an individual alarm zone. • For example, Senstar’s FlexPS micro- June 2019 - Edition 34 phonic fence sensor uses two sensor ca- bles (A and B, see image below), resulting in two alarms zones. • Ranging sensors – The sensor has dis- tance-measuring capabilities, enabling it to determine the location along the sensor cable where the disturbance event is occur- ring. For example, Senstar’s FlexZone and Fiber- Patrol locate intrusions to within 1 to 4 m (3 to 13 ft). Block sensors need physical field units to de- fine the start and end of zones. Ranging sen- sors allow a continuous run of sensor cable to be broken into zones through software. Block sensors need physical field units to define the start and end of zones. Ranging sensors allow a continu- ous run of sensor cable to be broken into zones through software. 3

June 2019 AST Magazine June 2019 AST Magazine | Page 5