| |
Exterior intrusion-detection sensors are placed around the exterior of an asset to detect intruders attempting to cross the boundary of a protected area. They are typically installed around the perimeter of a facility or around a specific building, and are typically used at sensitive locations that require high security, such as nuclear facilities, military bases, communications centers, utilities, and commercial facilities. Fence-associated exterior intrusion sensors are installed on a fence and are specifically designed to detect attempts to penetrate the fence, such as by climbing, cutting, or lifting the fence. Electric field/capacitance fences, which are more specialized types of fence-associated exterior intrusion sensors, can even detect intruders that are in the general area of the fence.
Infinity 2000
Electromechanical Vibration Sensor,
Integrated Security Corporation |
Fence-associated exterior intrusion sensors work by sensing disturbance in the fence fabric (or in the case of the electric field/capacitance fence, in the electric field around the fence). When the fence fabric or electric field is disturbed, sensors in/on the fence send a signal to an electronic control unit (typically a programmable logic controller or PLC). Different types of disturbances send signals of different strengths to the controllers. Actual attempts to cut or climb the fence will typically cause more stress in the fence fabric than will weather-related disturbances such as wind or rain, and thus these types of disturbances will send stronger signals to the controller. The controllers can be programmed to respond in different ways to signals of varying strength, and by setting a threshold response sensitivity, users can adjust the fence sensitivity to discriminate between disturbances caused by actual fence penetration attempts and those caused by weather conditions, etc. The controller will then send out an appropriate response signal based on this preset sensitivity and preprogrammed logic. For example, if the received signal was of the appropriate strength or type (i.e., if the disturbance was caused by an actual fence penetration attempt), the response signal may power an alarm or other action, such as activating cameras on the fence. If the received signal was not of the appropriate strength or type (i.e., if the disturbance should be ignored as a potential nuisance disturbance), the controller would not send out a response signal.
STI-290B Fence Vibration System
Safeguards Technology, Inc. |
There are three primary types of fence-associated exterior intrusion sensors. These are:
- Fence-disturbance/vibration sensors;
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Taut wire fences/Sensor fences; and
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Electric field or capacitance sensors.
Fence-Disturbance/Vibration Sensors Fence-disturbance sensors are typically used on chain link or other fence types where a moveable fence fabric is hung between posts. These sensors detect mechanical vibrations and stresses in the fence fabric and posts due to a disturbance of the fence fabric - such as by someone attempting to cut or climb the fence. Different sensors detect these changes through different physical mechanisms (see below for more detailed descriptions of sensor types), but generally, the disturbance of the fence fabric causes physical disturbance of the sensor, which results in a change from the baseline static condition of the sensor.
SC Fiber Optic Cable Sensor System
Fiber SenSys, Inc. |
For example, in a fiber optic cable, a disturbance would result in the attenuation of a light signal in a continuous fiber optic cable, while in a switch-based vibration sensor, the disturbance would cause a closed electrical circuit to open, disturbing the continuous flow of current in the sensor. When the baseline static condition of the sensor is changed by disturbance of the fence fabric, the sensor generates an electric signal that is transmitted to a control unit associated with the sensor. As described above, the control unit then interprets the signal from the sensor and responds appropriately.
Fence disturbance sensors can be subdivided into sensor systems consisting of continuous cable-type sensing units and sensor systems consisting of discrete sensors connected by data transmission cables. These two types of systems can in turn be divided into subcategories based on the sensor elements. These specific sensor types are described in more detail below:
Continuous cable-type sensing units:
- Strain sensitive cables (vibrations cause changes in electric signal running through cable);
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Fiber optic cables (vibrations cause attenuation of light signals in fiber cables); and
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Other technologies (example - Southwest Microwave has developed the Intrepid MicroPoint Cable System, which measures the time it takes an electric signal to travel from a transmitter to a receiver through a sensing cable. Disturbance of the cable causes the signal to deflect back to the transmitter; by calculating the travel time of the signal, this system can locate the point of the disturbance on the fence).
Discrete sensor-type sensing units:
- Switches/electromechanical transducers (vibrations cause electric circuits to open or close [depending on the type of sensor used], sending signal to control unit);
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Piezoelectric sensors (mechanical energy of impact with fence creates electric charge, which is detected by sensor); and
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Geophones (vibrations cause acoustic waves, which are detected by sensor).
DTR-2000
Taut Wire Intrusion Detection System,
Magal Security Systems |
Taut Wire Fences/Sensor Fences Taut wire/sensor type-fences are another, highly-effective option for detecting intruders climbing on or cutting the fence. These systems can be installed as stand-alone applications, creating a dual-purpose physical barrier/detection system; or they can be installed on existing fence systems. Taut wire fences/sensor fences are somewhat similar to fence disturbance/vibration sensors in that they use electromechanical switches to detect disturbance of the fence; however, in taut wire/sensor fences, the sensors are attached to very taut wire instead of loose fence fabric, and the sensors detect changes in the tension of the wire rather than vibrations in the fence fabric.
A taut wire/sensor fence sensor typically consists of a cylindrical microswitch installed on the fence post. These microswitches can be located over the entire length of the post or near the top of the post. They consist of a moveable center piece suspended within a cylindrical frame. The sensors are connected or attached to taut wires on the fence line. When the sensor is at rest, the center piece is not touching the frame, the switch is "open," and no current is conducted through the sensor. When the fence is disturbed (such as by someone attempting to cut or climb the fence), the tension on the wire changes, causing the center piece to move and come into contact with the outer frame of the sensor. This closes the switch and sends an electronic signal to the control unit, indicating that the fence has been disturbed.
The effectiveness of taut wire fences depends on the tautness, friction, and spacing of the wires. The tighter the wires are stretched and the closer they together, the more sensitive the fence. In practice, these systems are usually designed to be more sensitive to minor disturbances than are fence disturbance/vibration-type sensors. However, because of the high sensitivity of these types of fences, they are subject to nuisance alarms.
In addition to the high potential for nuisance alarms, taut wire/sensor fences have other potential drawbacks. Because of the high time requirements for installation and maintenance, taut wire sensor fences are usually more expensive than other fence sensor systems. Installation involves attaching sensors approximately 6 inches apart in a vertical line on the inside of a tamper-proof case/enclosure that is mounted on a fence post near the middle of the sensor zone. As described above, individual strands of wire are tensioned and attached to the switch so that the sensor remains in the normal, "open" position. Maintenance involves regular tensioning of the system to ensure the system performs as intended. While this process can be tedious, improper tensioning/maintenance of the sensors can result in poor or unreliable detection capabilities. Sensor Fences Using Posts as Sensors A variation on the taut wire/sensor fence technology is implementing strain gauges that are integrated into the fence panel design. The specially-designed fence posts contain distortion bridges/strain gauges, which measure any distortions caused by changing loads on the posts. Prefabricated, customized frames are hung between the posts to complete the fence.
Intelli-FIELD
Electrostatic Field Disturbance Sensor,
Senstar Stellar |
Electric Field or Capacitance Sensors Electric field or capacitance sensors are active sensors that detect a change in capacitive coupling among a set of wires attached to, but electrically isolated from, a fence. This type of sensor generates an electrostatic field between/around an array of wire conductors and an electrical ground, and the sensors within this array detect changes or distortions in this field. These changes/disturbances are caused by anyone approaching or touching the fence. An intruder entering the fence's electric "field" becomes a conductor, and current from the fence is diverted through the intruder, disrupting the continuous flow of current to the sensor wires. The signal processor detects this change, and, depending on the amplitude of this change vs. some preset sensitivity, generates an alarm.
One major difference between electric field/capacitance sensor fences and other fence-associated intrusion sensors is that electric field/capacitance sensor fences can detect intruders before they reach the fence line. The electric field generated by these fences extends outward in all directions from the fenceline, creating a larger protected space in front of the fence (the protected area extends behind and above the fence as well, although this space is less likely to be threatened than is the area in front of the fence). The intruder only has to enter that space, and does not have to actually physically disturb the fence, for the alarm to be triggered. This physical space is known as the fence's detection "volume." Most fences, including the fence disturbance/vibration sensor fences and the taut wire/sensor fences described above, do not have any volumetric elements in their detection capabilities, and they can only detect intruders actually disturbing the fence at the fenceline. However, fences which have a volumetric detection capability, such as electric field/capacitance fences as well as other types of systems, such aboveground microwave sensors, can extend the protected area away from the fenceline. Fences with larger protection volumes will protect a larger amount of space in front of the fence. The protected volume can be adjusted by adjusting the strength of the current going through the wires, which in turn affects the size of the electric field generated by the system.
Because of their grounding requirements, electric field/capacitance sensor fences have several major design differences relative to other fence-mounted sensors. In order to maintain effective grounding, an electric field/capacitance sensor fence system's wires must be electrically isolated from any other fence components. Therefore, this type of fence is typically mounted on its own posts. Electric field fences can be implemented as stand-alone applications or they can be applied to existing fences (i.e., they can be applied to existing chain link fences, etc.); in stand-alone applications, the wires are usually mounted at several different heights along a normal fence perimeter (the specific location of the wires will depend on the specific application design), while in fence-associated applications, the wires are attached to their own posts which are mounted on the existing fence posts. In capacitance fence applications, the wires are typically mounted as a three-strand array at the top of an existing fence fabric.
Table 1 summarizes the major characteristics of the three types of fence-associated sensors. Table 1: Fence Associated Sensors | Fence-Disturbance/Vibration Sensors | | General Characteristics | Sensors/sensing wires/cables attached to or woven through fence; physical disturbance of fence results in alarm signal. | | Intruder Detection Capabilities | Cutting, climbing, or other vibration/deflection of sensor wire or fence. | | Advantages | Many types of detection technologies available to fit user's needs. | | Disadvantages | Must be installed on chain-link or other type of fence with fabric hung between posts; subject to nuisance alarms. | | Taut-Wire Fences/Sensor Fences | | General Characteristics | Tensioned horizontal wires connected to detector posts; freestanding or fence-mounted. | | Intruder Detection Capabilities | Cutting, climbing, or other deflection of sensor wire. | | Advantages | No limitations in the type of terrain or the type of environment in which they can be installed; no limit on length; extremely low false alarm rate; high probability of detection. | | Disadvantages | Installation can be time consuming; inadequate fence maintenance or incorrect tensioning of the sensor wires will lead to unreliable operation. | | Electric Field or Capacitance Sensors | | General Characteristics | Electric field-generating wire coupled to sensor wire; freestanding or fence-mounted; can follow irregular terrain. | | Intruder Detection Capabilities | Intruders in general vicinity of fence; intruders do not have to disturb physical fence to be detected. | | Advantages | Wider detection volume than other fence-associated sensors; because there is no fence fabric, there will be no nuisance alarms due to motion of the fence. | | Disadvantages | Higher nuisance alarm rate than for other fence-associated sensors because of its sensitivity; can be affected by electrical storms and incorrect grounding. |
Attributes and Features Terrain Considerations Each of the fence types discussed in this document is "terrain-following," which means that it can be installed along any type of terrain (in various types of footings, including soil or manmade materials; up/down slopes; through swaths of vegetation; etc.). These systems are not limited to "line-of-sight" applications, where there is a direct line of sight between all sensing units. Other sensors types which broadcast active fields between sensor units (such as microwave sensors, active infrared sensors, etc.), may require line-of-sight in order to function correctly, and thus they may be limited by intervening terrain. Environmental Stability/Nuisance Alarms Because exterior sensors are installed outside, they must be able to withstand the elements while functioning correctly and also minimizing "nuisance" alarms. A nuisance alarm occurs when the sensors correctly detect an actual disturbance, but when that disturbance does not represent an actual threat. Thus a nuisance alarm would be an event such as an animal contacting the fence. In this scenario, the fence would react to the disturbance by triggering an alarm; however, the animal contacting the fence does not represent a real threat. Depending on the type of intrusion sensor and its sensitivity, nuisance alarms can also be caused by wind, rain, ice, standing water, blowing debris, or other causes. Nuisance alarms must be differentiated from false alarms, which are due to system malfunction, such as a signal being triggered when the fence has not been disturbed.
The following paragraphs describe how each of the fence-associated sensor types is affected by environmental factors, how these factors can cause nuisance alarms, and how these sensitivities can be mitigated.
Fence disturbance/vibration sensors: Nuisance alarms incurred by fence disturbance/vibration sensors include mechanical disturbances of the fence fabric, which could be caused by weather (for example, high winds); blowing debris; or ground vibrations (traffic, etc.). Nuisance alarms can be minimized by using rigid fence posts which will not move under strain from the elements, and by ensuring that the fence fabric is taut between the posts.
Taut wire/sensor fences: In contrast to fence disturbance/vibration sensors, taut wire/sensor fences are subject to few nuisance alarms because they typically require a higher amount of pressure (typically, around 25 lbs) before they are triggered than do fence disturbance/vibration sensors. Therefore, they are less sensitive to minor vibrations than are fence disturbance/vibration sensors. The primary cause of nuisance would be larger animals wandering into the fence.
Electric field/capacitance sensor fences are highly sensitive and therefore are subject to more nuisance alarms than are the other two sensor types. These nuisance alarms include the same nuisances to which fence disturbance/vibration sensors are subject, including fence motion and animal activity. In addition, because these sensors depend on electric fields, they are also subject to disturbance by electrical storms and poor grounding. Detection Area "Volume" As described above under electric field/capacitance sensor fences, detection area volume refers to the volume of space that is protected by a particular sensor. The detection volume is determined by the type of sensor that is employed at the fence. Fence disturbance/vibration sensors and taut wire/sensor fences require that the fence fabric be physically disturbed through some sort of vibration or movement before they are tripped. Therefore, the detection "volume" of these types of fences consists only of the length, height, and width of the fence itself. In contrast, triggering of an electric field or capacitance fence does not require that an intruder actually physically disturb the fence. In the case of these fences, the electric field generated by the fence extends outward from the fence; and thus an intruder moving near the fence, but not actually physically contacting it, may be detected.
A sensor fence with a larger detection volume protects more space then does a sensor fence with a smaller protection volume. This may be an important consideration for a utility. For example, an electric field or capacitance fence may detect the presence of an intruder who is scouting the fence line looking for weak areas. Fence disturbance/vibration and taut wire/sensor fences would not detect this intruder unless he actually physically disturbed the fence. Detection Sensitivity For each of these systems, the sensitivity of the fence (i.e., for fence disturbance/vibration sensors and taut wire/sensor fences, the force or disturbance of the fence necessary to cause an alarm; or for electric field/capacitance fences, the disturbance of the electric field that must occur before the alarm is triggered) can be controlled by the user. In each of these types of fences, fence or field disturbance causes a proportionately-sized signal (or a proportionately-sized disruption of a signal) to be sent to a system control element. This control element processes and analyzes the signal to determine whether or not it is a true alarm or just background noise. In fact, much of the proprietary technology in different fence-associated intrusion systems lie in the sensor elements and the control algorithms - particularly in their ability to compensate for background noise and to differentiate between background and intrusion attempt. However, users can often adjust the sensitivity of their fence systems by changing setpoints in the controller algorithms. It should be noted that the higher that the fence sensitivity is set, the more likely the fence will be to detect an intrusion attempt, but the more subject the system will become to nuisance alarms. Each user will have to determine the appropriate sensitivity for his or her application.
While most of these systems come with proprietary control elements, some may be able to be controlled by free-standing controllers. More information about electronic controllers is available from the Electronic Controllers Product Guide.
One type of enhancement to the detection sensitivity focuses on adding information about the prevailing weather conditions in order to increase or decrease the sensitivity of the processor. A weather sensor station can be mounted on the fence line to feed information to a field processor. The field processor then adjusts vibration alarm sensitivity based on inputs from the weather station to ensure an effective sensitivity range is maintained. Visual Deterrence Intruders may be discouraged from attempting to defeat a fence if they can see that it has additional security enhancements, such as an intrusion sensor. Each of the sensor systems described here is visible to any intruder viewing the fence, and thus they may provide a visual deterrent in addition to their detection functions. In contrast, a covert sensor system (such as a buried pressure sensor) cannot be seen by the potential intruder, and thus these type of sensors would not provide an added visual deterrent to attempted entry. However, visible sensors may also have disadvantages, because if an intruder sees that there are sensors on the fence, he may look for other, less well defended, areas for entry inside the perimeter. Implementation Considerations The correct implementation of a fence-associated intrusion sensor can make it a much more effective security measure. Security experts recommend the following when a facility implements a fence-associated intrusion sensor system:
- Many exterior intrusion systems, including fence-associated systems, are implemented using a double fence system with a clear zone in between. This setup consists of constructing an outer fence (which typically does not contain intrusion sensors) and then an inner fence (typically, a fence-associated intrusion sensor or some other type of exterior intrusion sensor, such as a microwave sensor) several feet behind it, with a "clear zone" in between the two fences. This clear zone acts a controlled area where conditions are kept optimal for the proper functioning of the sensor (i.e., animals cannot enter this area to cause nuisance alarms; objects cannot be blow into the fence through this area, etc.). Thus this clear zone reduces potential nuisance alarms, as well as the potential for vandalism. The clear zone also provides an ideal area for viewing attempted intrusions, because intruders would have to penetrate the exterior fence and then cross the clear zone before attempting to penetrate the fence-associated sensor system.
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Maintenance of the fence system is an important consideration for any of the systems described above. As discussed previously, taut wire/sensor fence systems have a high maintenance requirement that includes frequent tensioning of the wires. Electric field/capacitance fences may be affected by lightning, and thus if an area is subject to frequent lightning storms, these types of fences may need frequent maintenance.
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Response to a system alarm is crucial to any sensor system. Some facilities have visual surveillance systems set up to respond to a fence sensor alarm through the activation of cameras in the area of the alarm. However, this will be effective only if appropriately trained staff are assigned the responsibility for monitoring these cameras. In other cases, staff may be assigned to respond directly to alarms; however, assigning staff to check out alarms directly must be balanced with the potential for responding to repeated nuisance alarms. In any event, a facility's response plan must be well thought out, because having an intrusion system but no effective way to respond to alarms can be a costly and ineffective security solution.
Cost Fence Disturbance/Vibration Sensors
Strain Sensitive Cable Perimeter Products' FPS fence-mounted strain sensitive cable systems are approximately $25-$30/ft, installed. Fiber Optic Cable The IntelliFIBER fence-mounted fiber optic cable system (Senstar Stellar) sells for between $2 and $10/ft, uninstalled. Installation of one detection zone (approximately 6,550 ft, or 2 km) takes approximately ? day. BEI's Fiber Sensor cable is $15-$20/ft, uninstalled. Fiber SenSys' SC fiber optic systems (SC-3 and SC-4) cost approximately $1/ft, uninstalled. Fiber SenSys processors range from $3,000-$4,000 apiece. ECSI's FOIDS system fiber optic cables range from $1-$4/ft, uninstalled.
Several vendors offer stand-alone fiber-optic fences. Senstar Stellar's INNOFENCE ranges from $90-$115/ft, and takes approximately 1 day to install per detection zone. BEI Security's Fiber Net is $60-$70/ft, uninstalled. MicroPoint Cable Southwest Microwave, Inc.'s MicroPoint Cable Perimeter Fence Protection System costs approximately $7-$10/ft. This price includes all hardware and software necessary to implement the system. Installation is an additional cost. Electromechanical Vibration Sensors The Barricade 500 system (Senstar Stellar), which consists of electromechanical contact sensors, sells for between $17 and $20/ft, uninstalled. Their StarNeT controllers cost between $6,000 and $13,000, although these controllers can control several sensor zones. Integrated Security Corporation's Infinity 2000 electromechanical vibration sensing system costs $8/ft of sensor cable, uninstalled, plus $2,000 for the Transponder/Controller Card. The RBTEC SL-3 from Flair Electronics costs $12/ft uninstalled. Costs for Safeguard Technologies' STI-290B shaker system are as follows: the sensor cable costs between $100 and $170/ft, depending on the number of sensors per foot; the vibration processor reporting unit, which sends signals from the fence to a central monitoring location, costs approximately $4,700; and the control unit, which is used to monitor the system, costs approximately $27,000. Safeguards provides system installation and on-site training on the system for $1,200/day. The time required for an installation will depend on the complexity of the system. Piezoelectric Sensors The Copperhead piezoelectric vibration sensor system (FiberSensys) costs approximately $1,500 for one zone (500 ft.) of sensing cable plus an alarm processor. Geophones The Intelli-FLEX fence-mounted microphonic system (Senstar Stellar) sells for between $2 and $8/ft, uninstalled. Installation of one detection zone takes approximately ? day. Southwest Microwave's GEONET 651 M-Series is $30/ft. Taut Wire Fences/Sensor Fences The TW-8000 system from Flair Electronics is $5.50 per foot per wire. Integrated Security Corporation offers a chain link fence topped with a basic taut wire system for $75/ft. Perimeter Technologies sells a full height taut wire system (approximately 8 ft high, consisting of 26-28 wires) for $250/ft, installed, while an outrigger type system consisting of multiple wires mounted on top of the fence would be $75/ft, installed. Costs for Safeguards Technologies' DTR 2000 taut wire system are as follows: sensor posts cost between $4,600 and $7,500 per post, depending on the height of the post/number of wires; the vibration processor reporting unit, which sends signals from the fence to a central monitoring location, costs approximately $2,800; and the control unit, which is used to monitor the system, costs between $10,500 and $25,000, depending on the number of zones to be monitored. The outrigger system costs between $1,700 and $3,700 per unit, depending on the height of the outrigger/number of wires. Safeguards provides system installation and on-site training on the system for $1,200/day. The time required for an installation will depend on the complexity of the system. Electric Field or Capacitance Sensors
G-Line
Electric Capacitance Outrigger,
Perimeter Products, Inc. |
Senstar Stellar's Intelli-FIELD electric field fence sells for $25-$60/ft. Installation of one sensing zone takes approximately 1 day. Perimeter Technologies' E-Field fence, which is a freestanding fence-height sensor system that can serve either as a stand-alone barrier or as part of a two-barrier system (the E-field fence would be installed approximately 2 feet in front of an existing fence), is approximately $60/ft, installed. Perimeter Products' G-Line capacitance system, which is typically installed as a 3 or 4 wire outrigger system on top of an existing fence or wall, sells for approximately $30/ft, installed. Overall System Costs It should be noted that most of the costs above are for the detection sensors only (i.e., costs per liner foot of sensor cable, taut wire, electric field, etc.). True system costs will also include controller hardware, processing software, power supplies, data communications systems, data storage/processing systems, and installation costs. Individual vendors will be the best sources of information for the full cost of any of these systems. Vendors
Disclaimer: The information provided in this guide does not constitute an endorsement by the Environmental Protection Agency of any non-Federal entity, its products or its services. In addition, EPA does not endorse the vendors and products listed on this site. EPA is publishing lists of vendors on this site in an effort to further public awareness of vendors identified as possible contacts for further information and possible purchase of the different types of security equipment. The Agency has selected the listed vendors on that basis. The list of vendors is not a complete list, and EPA does not endorse the products or services of these vendors. --Fence Disturbance/Vibration Sensors--
Strain-Sensitive Cable FPS Systems Perimeter Products, Inc.
43180 Osgood Road
Fremont, California 94539
(510) 249-1450
www.perimeterproducts.com
|
Fiber Optic Cable FiberNet™ and FiberSensor™ Products
BEI Security
12502 Exchange Drive, Suite 408
Stafford, Texas 77477
(281) 340-2100
www.beisecurity.com
| Fiber Defender Series
Fiber SenSys, Inc.
9640 SW Herman Road
Tualatin, Oregon 97062
(503) 692-4430
www.fibersensys.com
| Fiber Optic Intelligence and Detection System (FOIDS)
ECSI International, Inc.
790 Bloomfield Avenue, Building C-1
Clifton, New Jersey 07012
(973) 574-8555
www.anti-terrorism.com
| Intellifiber
Senstar-Stellar, Inc.
43184 Osgood Road
Fremont, California 94539
(510) 440-1000
www.senstarstellar.com
|
MicroPoint Cable Intrepid MicroPoint Cable System
Southwest Microwave, Inc.
9055 South McKemy Street
Tempe, Arizona 85284
(480) 783-0201
www.southwestmicrowave.com
|
Switches/Electromechanical Sensors Infinity 2000
Integrated Security Corporation
2550 Oakley Park Road, Suite 100
Walled Lake, Michigan 48390
(248) 624-0700
www.integratedsecuritycorp.com
| SL-3
Flair Electronics, Inc.
650 West Foothill Boulevard
Glendora, California 91741
(800) 532-3492
www.flairsecurity.com
| STI-209B Fence Vibration System
Safeguards Technology
75 Atlantic Street
Hackensack, New Jersey 07601
(201) 488-1022
www.safeguards.com
| Barricade
Senstar-Stellar, Inc.
43184 Osgood Road
Fremont, California 94539
(510) 440-1000
www.senstarstellar.com
|
Piezoelectric Sensors Copperhead™ 400 Series
Fiber SenSys, Inc.
9640 SW Herman Road
Tualatin, Oregon 97062
(503) 692-4430
www.fibersensys.com
| STI-100 Fence Protection System
Safeguards Technology
75 Atlantic Street
Hackensack, New Jersey 07601
(201) 488-1022
www.safeguards.com
|
Geophone/Acoustic Sensors Acoustic Intrusion Perimeter Detection System (APIDS™)
ECSI International, Inc.
790 Bloomfield Avenue, Building C-1
Clifton, New Jersey 07012
(973) 574-8555
www.anti-terrorism.com
| Intelli-Flex
Senstar-Stellar, Inc.
43184 Osgood Road
Fremont, California 94539
(510) 440-1000
www.senstarstellar.com
| GEONET
Southwest Microwave, Inc.
9055 South McKemy Street
Tempe, Arizona 85284
(480) 783-0201
www.southwestmicrowave.com
|
--Taut Wire Fences/Sensor Fences-- Inno-Fence
Senstar-Stellar, Inc.
43184 Osgood Road
Fremont, California 94539
(510) 440-1000
www.senstarstellar.com
| Taut Wire System
Integrated Security Corporation
2550 Oakley Park Road, Suite 100
Walled Lake, Michigan 48390
(248) 624-0700
www.integratedsecuritycorp.com
| TW-8000
Flair Electronics, Inc.
650 West Foothill Boulevard
Glendora, California 91741
(800) 532-3492
www.flairsecurity.com
| NIR Taut Wire Detection System
The Mistral Group (U.S. representatives)
7910 Woodmont Avenue, Suite 820
Bethesda, Maryland 20814
(301) 913-9366
www.mistralgroup.com
| DTR Series Taut Wire System
Safeguards Technology
75 Atlantic Street
Hackensack, New Jersey 07601
(201) 488-1022
| VTW-400
DeTekion Security Systems, Inc.
3209 Vestal Parkway East
Vestal, New York 13850
(607) 729-7179
www.detekion.com
| D-Fence, D-Corative System
The Mistral Group (US representatives)
7910 Woodmont Avenue, Suite 820
Bethesda, Maryland 20814
(301) 913-9366
www.mistralgroup.com
|
--Electric Field/Capacitance Sensor Fences-- Intelli-Field
Senstar-Stellar, Inc.
43184 Osgood Road
Fremont, California 94539
(510) 440-1000
www.senstarstellar.com
| G-Line
Perimeter Products, Inc.
43180 Osgood Road
Fremont, California 94539
(510) 249-1450
www.perimeterproducts.com
| Westminster International
Westminster House
Blacklocks Hill
Banbury
Oxon, OX17 2BS
United Kingdom
+44 (0)1295 756300
www.wg-plc.com/international/
| Magal Security Systems Ltd
P.O. Box 70
Industrial Zone
Yahud 56000
Israel
972-3-5391444
www.magal-ssl.com
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