Advanced acoustic perimeter detection system

February 2011 Perimeter Security, Alarms & Intruder Detection

Protection of Vibracrete walling.

Vibracrete walling is used extensively in South Africa as a preferred walling system for perimeters. While this may keep dogs enclosed it is a very simple barrier to penetrate and gain access onto your premises. In some cases whole panels of vibracrete walling are knocked out and people can simply gain access to your premises and carry out large items. Those who have this type of walling system know how often panels have to be replaced after intrusions.

Electrified fencing can also be installed on the inside of the vibracrete wall although this combination is still not an effective secure perimeter barrier. Electric fencing also used extensively in South Africa, has its weaknesses and determined intruders know how to get past electric fencing.

What is needed is an early warning system that will alert guards to the fact that the wall is being damaged or knocked and respond to the attempts of the intruder immediately. Modular’s AcoustAlert perimeter detection system which uses microphonic cable as the detection method can pick up this type of interference on vibracrete walling and via the field processors relays this information back to the guard room for immediate action. In addition this information can also be immediately transferred to offsite control rooms for remote verification by use of CCTV cameras.

The AcoustAlert detection cable is simply applied to the wall with an outdoor UV protected adhesive similar to Sista Flextec or other outdoor adhesives. Since the majority of intruders knock out the bottom panels on vibracrete walls, the detection cable is fixed diagonally across the three bottom panels in a zig-zag fashion over the length of the wall. Since the maximum length of the detection cable per detection zone is limited to 300 m per zone, using this zig-zag method, you will cover a wall length of less than 300 m. This zig-zag pattern can be used to cover all the panels in a wall section, in this way the detection cable will be physically fixed to all vibracrete panels and will ensure maximum detection over the full height of the wall. Using this pattern, the total zone length will probably be about 200 m using 300 m of cable.

Modular’s AcoustAlert perimeter detection system, made in South African, is a cost effective and reliable form of perimeter detection. It is very low on maintenance and easy to repair any section of cable that may have been damaged or cut. The cable is fitted with end of line termination for cable integrity testing to ensure the entire length of cable per zone is fine.

For further information about AcoustAlert or its application please contact Cliff Rose, 083 456 9542 or


Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Manage exceptions only
July 2019, Secutel Technologies , Perimeter Security, Alarms & Intruder Detection, Products
Secutel Technologies brings intelligence to all cameras with its locally designed, manufactured and marketed SecuVue Cloud Video Recorder (CVR), turning cameras into intelligent sources of information.

GSM IceCube Gateway
July 2019, Radio Data Communications , Perimeter Security, Alarms & Intruder Detection
The GSM IceCube Gateway unit is a new generation, multi-directional interactive gateway module which replaces the traditional radio, and is a key component to generating future revenue for security companies.

Network cameras with strobe light and alarm
June 2019, Hikvision South Africa , Perimeter Security, Alarms & Intruder Detection
Hikvision has introduced the new AcuSense network camera series to its EasyIP 4.0 security solutions, featuring a strobe light and an audio alarm.

Enhancing perimeter security with video
June 2019, Pelco by Schneider Electric , CCTV, Surveillance & Remote Monitoring, Perimeter Security, Alarms & Intruder Detection
Securing perimeters, whether they surround an airport, seaport, or an oil and gas facility, require a layered approach.

Intrusion detection with visual ­verification
June 2019, Secutel Technologies , Perimeter Security, Alarms & Intruder Detection, Integrated Solutions, Products
Secutel Technologies’ Visual Verifier is an effective intrusion system designed specifically to accommodate for low bandwidth availability and low power usage.

A secure home on your phone
June 2019, Fidelity ADT Security , Home Security, Perimeter Security, Alarms & Intruder Detection
The latest offering in home security from Fidelity ADT is a product that gives the customer the control they need over their home security – no matter where they are.

Smart integration for complete home security
June 2019, Inhep Electronics Holdings , Home Security, Perimeter Security, Alarms & Intruder Detection, Residential Estate (Industry)
IDS is integrating its IDS X-series control panels, X-wave2 wireless technology, Optex’s sensing systems and the HYYP Smart Home and Control Room System in one platform.

Intruder detection is becoming smarter and more mobile
May 2019, Elvey Security Technologies , Regal Distributors SA , Editor's Choice, Perimeter Security, Alarms & Intruder Detection
Alongside the new technologies continually being developed, existing technologies are being co-opted into not only performing an intrusion detection role, but combatting that bane of the electronic security industry: false alarms.

Effective intruder detection: more important than ever
May 2019, Powell Tronics , Perimeter Security, Alarms & Intruder Detection, Products
While intruder detection systems abound, not all solutions are created equal. Ensuring that their intruder detection system is with them for the long haul is something that all end-users desire.

Outdoor sensor with anti-masking
May 2019, HiTek Security Distributors , Perimeter Security, Alarms & Intruder Detection
The Viper, made by Duevi, is an exterior sensor integrating technologies such as active anti-masking, Redsense digital analysis algorithm and a simple walk-test mode.