Taut Wire

Tension Fence Intrusion Detection Systems

InnoFence

Taut Wire
Tension Fence Intrusion Detection Systems

  • Detect & locate in multiple zones
  • Guaranteed performance less than 1 false alarm per 1 km per 3 months
  • Delivering deterence, detection & delay of intruders
  • Applicable To:

  • Customize whole fence or top of wall

Features

  • Guaranteed high Probability of Detection (PD)
  • Very low FAR / NAR
  • Inherent self-adjusting mechanism
  • Vertical resolution of detection within a given zone
  • Low power consumption
  • Low maintenance costs
  • Commonly used in wall-mounted applications

Taut Wire is a high performance physical barrier combined with multiple high quality sensors. Taut wire is considered the most reliable and robust solution for perimeter intrusion detection. Its key advantages are that: it physically prevents intrusions by unauthorized personnel into high security sites; it has no environmental limitations and it delivers a very high and guaranteed Probability of Detection (PD) with minimal False and Nuisance Alarm Rates (FAR / NAR).

The technology of Taut Wire incorporates an array of detectors each connected to a pair of barbed wires with multiple sensors per zone, making it a very redundant system with practically no single point of failure. Taut Wire is a very cost effective solution for wall-mounted applications where there is a moderate number of barbed wires.

The mechanical Taut Wire sensor has a self-adjusting mechanism to compensate for soil movement, temperature changes, etc. It is an extremely robust sensor and unaffected by Electro-Magnetic Interference and Radio Frequency Interference (EMI / RFI), for example near transmission stations and power plants.

Taut Wire is installed in hundreds of sites around the world in many types of climates, demonstrating unparalleled endurance and reliability. In fact, Taut Wire systems have been operating in many sites for more than 20 years without the need for major refurbishment or upgrade.

Market

Taut Wire is an ideal solution for long perimeters with minimal infrastructure (such as borders or remote sites), as well as for harsh climate installations.

Taut Wire is also well suited to high profile CIP (Critical Infrastructure Protection) such as nuclear facilities, military sites and other sensitive locations like airports, energy utilities and prisons.

How it works

Taut Wire consists of multiple twisted barbed wires, typically separated in 9 - 20 cm (3.5 - 8 in.) intervals and stretched along a typical segment of 50 meters (164 ft.).

Taut Wire sensors are mounted on sensor posts located halfway between adjacent anchor posts. An array of tensioned barbed wires is run between the anchor posts, supported and spaced by spirals.

Each sensor is clamped to two adjacent wires. A deflection or cutting of a wire causes an alarm. The wires are spaced sufficiently close together to make it impossible for an intruder to penetrate them without causing an alarm. For alarm reporting purposes, the sensors in each post are divided into a maximum of six (6) separate alarm groups, which allows isolation of the compromised section of the fence (bottom section, middle section, top section). This capability, when analyzed properly, can distinguish climbing scenarios against other types of intrusions. It will also eliminate nuisance alarms caused by small animals and improve fault isolation.

Taut Wire
Taut Wire

Taut Wire offers complimentary parts to create a full system. Gates, cross corners and places where obstructions are a challenge, can be addressed through customization.

Taut Wire

Cross corners

Interface - Two options

  • SPRU (Sensor Port Reporting Unit) is connected to all the sensors at each sensor post. The SPRU is connected to the control room by multi-drop proprietary RS-422 cable which also provides power to the system. The RS-422 communication has been optimized to support up to 127 processors on a single 5 Km (3 mile) cable.
  • GPRU (General Purpose Reporting Unit) is connected to several (usually eight) sensor posts, providing dry contact output for each sensor post to external systems. The GPRU comes in either an outdoor enclosure or can be installed in a third party or provided enclosure / cabinet.

Communication: 4 wires, multi-drop, proprietary RS-422

Number of SPRUs: Up to 127 on a single cable with maximum 5 Km (3 miles). Max length may expand using repeaters or several cable sections

Number of GPRUs:Unlimited

Power:12 to 30 VDC

Current consumption:SPRU – 1.2 mA, GPRU – 100 mA max

Specification

Taut Wire

Typical Configuration
Typical Configuration A typical Taut Wire installation consists of a 2m (6.6 ft.) vertical component with a 1 m (3.3 ft.) inclined outrigger. The vertical component houses 20 taut wires. The inclined outrigger houses 10 taut wires.
Physical
Sensitivity Fixed and independent of climatic conditions
Detection force 15 - 30 kg (33 - 66 lbs.) of force or more will activate an alarm
False Alarm Rate (FAR) Less than 1 per 1 Km per 3 months
Performance
Sensor MTBF 25 million hours
MTTR 30 minutes
Environmental
Temperature range -40 °C to 72 °C (-40 °F to 160 °F)
Relative humidity Up to 95%
Climatic Unaffected by wind, temperature changes, rain, hail, snow, dust, UV radiation. Trouble and maintenance-free in desert conditions, severe storms, tropical climates and sub-zero snow covered areas
Corrosive atmosphere Suitable for almost all environments, special stainless steel version available for exceptional conditions
Lightning & electronic transients Complies with MIL-STD-9094A
EMI / RFI UComplies with MIL-STD-461/462

Specifications are subject to change without prior notice.

Taut Wire Datasheet

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Taut Wire Datasheet PDF Download