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ACOUSTIC GLASS BREAK DETECTORS

  • First-class monitoring of various glass types including standard glass, tempered glass, laminated glass and foiled glass
  • Advanced signal handling with microprocessor
  • DRC, Digital Room Compensation
  • Integrated event memory
  • Test functionality with the acoustic tester ADT 700
  • Easy set up using DIP switches
  • Tamper protection
  • Anti-Mask (AD 800-AM)

The AD 700 /AD 800-AM is a state of the art acoustic glass break detector for monitoring of one or multiple glass areas. It is developed with the latest microprocessor technology and has a number of advanced algorithms connected to the acoustics of the room (Digital Room Compensation, DRC). Thanks to these algorithms, a glass breakage signal can be distinguished from other interferences. The detector holds VdS and EN approvals for high immunity to false alarms. Intended for indoor installation, the device can be mounted either on a ceiling or wall, opposite the protected glass. The detection range spans 9 meters, 165°, which means that one detector can monitor multiple windows in a room. The detector should be placed in a location with an unhindered view of the monitored glass areas. Avoid mounting the detector in corners.

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ACOUSTIC TESTER FOR THE AD SERIES (700/800-AM)

  • Acoustic calibration and on-the-spot testing
  • Remote test mode without opening detector
  • 3-minute timeout to conserve battery
  • Battery charging via external charger

The ADT 700 is a unique tester for use with the AD 700 detectors series as well as AD 800-AM. The tester emits a spectrum of signals at certain frequencies and sound levels. The acoustic sound from the ADT 700 that enters the room is received by the AD 700 / AD 800-AM detector via broadband microphone. The signals are filtered, processed and evaluated. The microprocessor compensates for early reflections and selects the best algorithm based on the detector location to ensure maximum detection capability. Audio signals undergo dramatic change from the broken window through the room to the detector. As a result, the AD 700 / AD 800-AM has three separate settings, each with its own algorithm. With the ADT 700 tester it is possible to test which setting is most suitable for each installation. The detector measures the characteristics of the signal and the processor gives the installer a recommendation of which setting is preferable. If several glass panes are protected by one detector, the ADT 700 repeats the test for every window to create an overview of the detection  one. The detector calculates an average value for the detection zone and provides a recommended adjustment. If the detector does not give an indication when testing, the window is located outside of the coverage zone and the detector should be relocated or an increased number of detectors are required.

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GLUED GLASS BREAK DETECTORS

ALARMTECH’s GD 300 series of glued glass break detectors offers reliable and secure detectors for monitoring panes of standard or tempered glass (GD 370 GD 375 and GD 475 for laminated glass) with high-level immunity to false alarms. The detectors can be installed in environments with substantial background noise enabling 24-hour security without complication. They solely detect the shattering of glass and are unaffected by background noise.

A piezoelectric crystal sensor identifies the vibration signal generated inside the glass when shattered. The detector’s electronic analyser is set to high frequency in order to distinguish external disturbances from actual glass breakage. The detector is easy to install and does not require maintenance.

  • GD 330 and GD 370 have a built-in relay, which is powered and can be used directly via a detector loop.
  • GD 335 GD 375 and GD 475 have a transistor output with power disabled in standby mode. These detectors must be connected to the interface unit IU 400 or directly via a detector loop especially suited to this type of detector.

For laminated glass

  • GD 370, GD 375, GD 475 are for use with laminated glass as well as all other types of glass.

Test Units

  • GVT 5000 is an advanced glass breakage tester, which replicates the acoustic signals generated when a glass pane is shattered or broken.
  • GVT 500 is a simpler test unit that can be used with the glass break detectors for standard glass, GD 330 and GD 335.

Installing detectors on glass

The glass break detectors must be glued directly onto an undamaged glass pane to ensure detection of the vibration generated inside the glass when shattered or broken. The detectable radius depends on the thickness of the glass – the thicker the glass, the larger the radius. Standard glass of 4 mm thickness has a detectable radius of two metres from the detector. Detectors can be used with a maximum glass thickness of 6.4 mm, which extends the detection range to an approximate four-metre radius. When mounting on glass surfaces that are covered in protective film, the detector should be mounted directly on the glass pane, not on the protective film. Consequently, when installing detectors on windows covered in protective film, a 5–10 cm hole must be cut out the film. Over time, window panes are exposed to changes in temperature and humidity as well as UV radiation. It is therefore very important to use the recommended adhesive during installation and ensure the gluing process is undertaken according to instruction to guarantee detection capability.

The adhesive kit GDK 100 has successfully been used over the past 20 years, since production of the detector series first started. The glue has proved resistant to the environmental impacts of temperature, humidity and UV rays as well as the effects of cleaning products.

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MAGNETIC CONTACTS

A magnetic contact has two parts, the contact with one or more reed switches and the magnet. In its neutral position the reed switch remains closed under the force of the magnetic field. Opening the object being monitored increases the distance between the reed switch and the magnet. This reduces the influence of the magnetic field on the reed switch until it opens and activates an alarm. Please note that the opening gap varies with the environment and type of installation, the values in this catalog are nominal and should be seen as a reference only. For each installation the gap has to be tested to ensure  full functionality of the contact.

The reed switch

In all Alarmtech contacts only the highest quality and performance switches are used. This ensures a safe contact function and guarantees an extremely long operating life and fits the most demanding applications.

The magnet

Alarmtech use two different materials in the magnets for creating a big gap between the magnet and the contact part. When the contact and the magnet is mounted parallel with each other a long magnet is normally needed and if mounted opposite each other a short magnet is used containing a different material.

Function of a standard contact

Two gaps are important: The closing gap, when the magnet is approaching the contact and the opening gap, when the distances increase between the parts. The opening gap is approximately 10% wider than the closing gap depending on the necessity for a stronger magnetic field to close the contact.

Mounting on steel

The Alarmtech contacts are designed for mounting on steel doors, safes, filing cabinets, gate and roll-up garage doors. There are many specially designed accessories for this kind of applications. Mounting on steel doesn’t drain the magnet, however it reduces its magnetic field, resulting into smaller make/break gaps of the magnetic contact.

High security contacts

High security contacts have one or more extra reeds inside to protect the contact from sabotage. Two distances need to be determined. The first is the closing distance when the contact approaches the magnet and the second when the sabotage reed opens when the magnet is very close to the contact. To get the highest security always place the magnet as close as possible to this second distance.

Built-in EOL Resistors

Every contact can be delivered on customer request with built-in resistors of any resistor value in E36 series 1%. The resistor can be mounted parallel and/or in series with the reed switch. Minimum order required is 100 pcs. Add P to the resistor value for parallel connection and S to the resistor value for serial connection to the reed switch.

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PERSONAL ATTACK BUTTONS

When developing ALARMTECH’s series of personal attack buttons we have considered the prevalent problems with the simpler devices on the market.

Our devices, therefore, do not include heavy elements that can be affected by external magnetic fields or are sensitive to impact but instead have real  goldplated switches to ensure long and reliable operation. All our devices have appropriate screw terminals with wire protection for ease of installation and are also equipped with anti-tamper switches that protect against unauthorised opening.

There are two main types of switches: electronic and mechanical. Our most advanced personal attack button, the HB 120, is an electronic switch with dual push button operation and built-in event memory. It has two relay outputs that allows for two differing events to be indicated, for example assault and incident.

Mechanical buttons are available with dual or single push-button operation and either latching or momentary switch functions.

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POWER SUPPLY UNITS

Vip_logo.png PSV Power supply units

ALARMTECH has developed a series of power supply units with ViP (Voltage in Parallel) function for intrusion detection and access control systems.

The units are available in both 12 VDC and 24 VDC versions and all are equipped with LED indication.

A power supply unit with ViP feature can be connected in parallel to provide redundancy (higher security) and reduce the voltage drop in the cables.

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VIBRATION DETECTORS

ALARMTECH offers two types of vibration detectors: shock detectors (CD series) and seismic detectors (VD series).

The shock detectors sense vibrations of high amplitude and short duration. They are primarily used to monitor structures made with multiple joints and of soft materials, for example, window frames, door frames and brick walls, where intrusion is expected to place with the aid of blunt objects and great force. The detector sensitivity is set to low frequency vibrations that occur in soft building materials.

Seismic detectors sense vibrations of low amplitude and long duration. They are primarily used on hard, uniform materials such as steel, sheet metal and concrete, where intrusion is expected to take place with the aid of sophisticated tools. Typical applications include safes, ATMs, glass partitions and concrete walls. Seismic devices require longer detection time than shock devices, therefore they are more resistant to false alarms.

Operating principles

Vibrations in a material that are created by external force spread inside the material, just like waves on a water surface. Every joint in a structure reflects and reduces the signal. Our shock and seismic detectors include a piezoelectric sensor that generates a signal with an amplitude proportional to the strength of the vibration.

The lower the vibration signal, the more important the contact between the sensor and monitored material becomes. This is extremely important for seismic detectors as intrusion attempts can be made with equipment that creates small vibrations. It is not of equal importance for shock detectors, which are used to monitor objects where high signal amplitude is expected.

The CD 400/CD 550 and VD 400/VD 500 are electronic detectors, each with their own evaluating electronics based on digital signal processing in a microprocessor with an advanced detection algorithm. In electronic detectors, the amplitude, frequency and duration of the vibration that triggers an alarm can be defined. There are many low frequency disturbances caused by activities within buildings as well as outside traffic that are eliminated with frequency filters and by the detector algorithm.

In a conventional mechanical detector only lower frequencies can be detected, due to the principle that a weight must be moved and cause brief interruption to an electrical circuit. Although a weight cannot swing at high frequencies, molecules of a piezoelectric crystal can. An electronic detector with an advanced detection algorithm is therefore more resistant to false alarms than a mechanical detector.

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FIBRE OPTIC ALARMS

ALARMTECH’s fibre optic alarm systems are developed to monitor office equipment, such as computers, screens, projectors and other types of accessible units.

The control unit is connected to a 24-hour loop in the control panel and any attempt to remove a device or sabotage the optical fibre will generate an alarm.

The fibre allows the monitored device to be used in a normal way and the system is completely insensitive to electronic interference.

The optical fibre is soft and about 2 mm in diameter, which makes it easy to bend. Maximum length of the fibre is 40m, which allows many devices to be monitored from one control unit. Connection to the host system is achieved through relay output on the control unit.

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DOOR LOOPS

A door loop is used to protect and simplify transmission of signals with a cable from windows and doors to the frame. Alarmtech’s product range offers door loops both with and without terminal connectors/blocks.

The DL 6 door loop with terminal consists of a junction box with tamper protection. The cable connecting door and frame has a 6-pin modular connector at each end that easily snaps into the terminal connector. The cover of the junction box locks the connector and it can only be disconnected when the cover is removed. The cable may either be straight or coiled.

The door loops without terminals consist of a flexible stainless steel hose and two mounting plates with latching hooks that secure the stainless steel hose.

The stainless steel armoured flexi-tube with end caps is available with a white or brown plastic coating. The cable is protected against the sharp edges of the metal hose at each end with a plastic conduit.

The mounting plates have extra room to allow for cable splicing. Furthermore, there are selected openings of the cable in three directions to ensure it can easily be cut in the direction required.

The stainless steel armoured flexi-tube is available in two outside diameters - 8 mm and 14 mm - with supplementary end caps. The plastic conduit that protects the cable at both ends allows for a cable diameter of 4 mm for the DL 8 series and 8.8 mm for the DL 14 series.

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JUNCTION BOXES

ALARMTECH has developed a series of junction boxes and cable loops suitable for most types of security installations.

There are different varieties of junction boxes depending on application, for example, our compact JB 6 box is small in size and suitable for installation by a door or window frame.

Simple and discreet installation has been taken into consideration during the development. The boxes have appropriate screw terminals with wire protection and are ready for attachment of a 10 x 20 mm cable trunking. 

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RELAY MODULES

ALARMTECH has developed a series of relay cards / relay boxes that suit most types of low voltage and security installations (intruder alarm, access control, fire alarm etc.)

All cards and boxes are developed to suit both 12V and 24V (9-30 VDC) systems.

The RC 1 and RC 2 have an alternating switch function while the others have a dual alternating switch function.

RC 4 supports both AC- and DC-power supply and has a 2A relay.

The smaller cards (RC 1, RC 2, RC 3 and RC 4) are supplied with self-adhesive pads for easy installation and the transistor control of the relay means a very low control signal is required. All cards have appropriate screw terminals with wire protection.

Simple and discreet installation has been taken into consideration during relay box development and they are ready for attachment of a 10 x 20 mm cable trunking.

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