Wireless Glass Breaking Sensor for Ajax GlassProtect Alarm
The security system of the premises is designed to protect the territory from fires, leaks and intrusions of intruders. For each type of threat, there are appropriate detectors that help prevent damage to property and secure the premises. The glass breaking sensor is one of such devices. Glass break sensors are used indoors and signal a break-in after fixing the corresponding sound. Glass break detectors are installed both in private premises and in shops, offices, etc. Before installing the glass break detector, it is worth getting acquainted with the types and features of the devices.
Classification of glass breaking sensors
According to the principle of operation:
Piezoelectric sensors of glass breaking — react to mechanical impact. The sounders activate the oscillation in the glass sheet after the impact. Piezoelectric sensors come in two types.
Shock sensors are equipped with additional sensitive elements that are triggered by the first inertial pulse. The second type of piezoelectric glass break detectors detects mechanical vibrations of the material even before its destruction. The piezoelectric element then converts the signals into an electrical pulse. Sensitive sensors are fixed on the glass surface. This type of sensor has limited sensitivity settings, and it is almost impossible to use it to protect large glass panels.
Electrocontact sensors of glass breaking — determine the integrity of the glass by mechanical control. Such detectors are triggered by a light blow with proper installation.
The electrocontact type sensor is presented in the form of a thin wire in a fragile shell or in the form of a wide strip of metal foil, which is covered with a lacquer dielectric. An electric current is passed through the conductor. When the glass surface is broken, the conductive element breaks. This technology is used very rarely due to a number of disadvantages:
Time-consuming installation of fragile elements and the impossibility of their connection in case of accidental rupture, even by soldering.
Not an aesthetic appearance and excessive attraction of the attention of intruders. The glass can be cut without touching the wires.
Acoustic sensors of glass breaking — react to the sound characteristic of broken glass. Sound detectors activate an alarm signal if they detect acoustic waves in the spectrum characteristic of broken glass.
Distinctive characteristics of acoustic glass break sensors:
High reaction rate to the pathogen and recognition accuracy.
Wide customization options and high sensitivity.
Convenient installation and connection. Installation on walls or ceiling indoors.
Acoustic glass break sensors are the most common in alarm systems. Devices of this type have a high level of protection and the absence of false alarms for extraneous sounds.
Features of acoustic glass breaking sensors
The algorithm for triggering the device:
The microphone of the sound sensor receives acoustic vibrations and turns them into an electrical signal.
The electronic circuit of the device processes the electrical signal, analyzes it and compares it with the threshold values that are stored in the memory of the glass break sensor.
Depending on the model, the actuators of the sound sensor can form several types of signal. For example, the notification of the environment or the transmission of an alarm signal to the central security console.
The analysis of acoustic waves takes place in low-frequency and high-frequency amplitudes. As a result of hitting the glass, low frequencies appear, and high frequencies are the sound of a broken glass sheet.
Device Selection and Installation Options
When choosing a sound-type glass break sensor, you need to pay attention to the type, size and thickness of the controlled glass sheet. Most models are universal devices that have information about the most common types of glass in construction in their memory. The acoustic sensor can work with 2.5-8 mm glasses.
It should be noted that for reinforced or laminated glasses, separate settings or specific sensor models are needed.
Type of food. There are glass breakage sensors both with an autonomous power source and with connection to the alarm system loops. Such devices operate from 8-30 V. Wired breakage sensors need to be laid in the interior at the design stage to install the power cable. Effective response distance. It is not necessary to place the device at the maximum distance specified by the manufacturer in the instructions, since at the same time the sensitivity of the sensor works at the maximum and more energy is consumed. It is recommended to mount glass break sensors on walls or other load-bearing structures and structures that are not subjected to vibration at a height of up to 2 m. This arrangement of the device will prevent blocking the signal of the glass break detector by third-party objects, as well as its unauthorized dismantling. When installing the device, it is necessary to take into account the presence of protective films, curtains and other elements on the glass, they can distort or make a weak sound of breaking. An important function of the glass breaking sensor is anti—masking, which can prevent the operation of sensitive sensors from being blocked.
Ajax GlassProtect Wireless Glass Breaking Sensor for Indoor Installation
The principle of operation of the glass breaking sensor for Ajax GlassProtect alarm
Ajax GlassProtect Glass break detector is a wireless device designed to detect broken glass sheets in a protected area. The sensor detects and captures low-frequency and high-frequency sounds of glass breaking with a sensitive microphone. After detecting the fact of the incident, the sensor sends an alarm signal to the alarm control panel via a secure Jeweller radio channel. The wireless detector reacts to the sound of broken glass, ignoring other loud sounds, after a multi-stage signal analysis. The installation of the wireless glass breaking sensor on the SmartBracket mount is carried out in a few minutes, without disassembling the case. The device is used in private premises, office buildings, shops, restaurants, banks, warehouses, etc. The GlassProtect wireless glass breaking sensor transmits a signal via two-way radio communication, which protects the device from forgery and encrypts the transmitted information. This principle of signal transmission provides security alarm protection against hacking attempts. Communication is maintained at a distance of up to 2000 m to the hub control panel, provided there are no obstacles. The security glass breaking sensor is compatible with wired centers due to the possibility of connecting the receiver of Ajax ocBridge Plus radio sensors. The wireless glass breaking sensor detects the exciter at a distance of up to 9 meters. If someone tries to break a window to get into the room, the alarm system will immediately inform users and the security company about the incident.
