WO2012085606A1

WO2012085606A1 - Electronic home protection apparatus

Info

Publication number: WO2012085606A1
Application number: PCT/HU2011/000116
Authority: WO
Inventors: Balázs BENCSIK
Original assignee: University Of West Hungary
Priority date: 2010-12-22
Filing date: 2011-11-30
Publication date: 2012-06-28
Also published as: HU1000685D0; HUP1000685A2

Abstract

The present invention refers to an electronic home protection and burglar prevention apparatus with active surveillance and intervention units and functions. By means of the home protection apparatus, in response to an alert signal, a protected indoor area can be flooded by a gas irritating the human mycoderm. The intruder is disturbed in clear sight and easy breath as a consequence of exposure to the irritating gas. The apparatus comprises a central control unit, an alert unit and remotely placed mobile units containing a PIR sensor and a microwave sensor. The central control unit and the alert unit can be connected to an air condition, ventilation or exhaust gas system of a building. The air-condition or exhaust gas system can be controlled by the home protection apparatus to stop ventilation in the event of an intrusion when high concentration of an irritating gas has to accumulate in indoor spaces.

Description

Electronic home protection apparatus

The present invention refers to an electronic home protection apparatus with active intervention functions for burglar prevention. By means of the home protection apparatus - in response to an alert signal activated by unauthorized intrusion into an indoor area - a protected indoor area can be flooded by a gas irritating the human mycoderm and as a result of exposure to the irritating gas the intruder is disturbed in clear sight and easy breath. The home protection apparatus of the present invention can be connected to existing, previously installed electronic protection systems or to any arbitrary safety system as a supplementary unit or subsystem. The home protection apparatus of the present invention can also be used as an alarm or warning device for health monitoring purposes, e.g. for sensing carbon monoxide (CO) or other gases.

Electronic protection systems operated by means of dispensing gases which inhibit intruders in their actions are well known in the relevant technical field.

In patent US 5402000 a room security system is disclosed, which has a deterrent sprayer for deterring intruders positioned on a ceiling of a room selectively inward and in front of an entryway to the room. A spray nozzle of the deterrent sprayer is actuated by an actuation signal. The actuation signal is transmitted by mechanical, electrical, electronic, light, magnetic or gaseous means in working relationship with the closure and the entryway (the closure of the entryway can be sliding doors with a first magnetic member mounted on a first sliding door and a second magnetic member on a second sliding door in juxtaposed relationship Travelling of the first magnetic member away from the second magnetic member causes activation). Opening signal of the sprayer is activated electronically or mechanically, and is transmitted by RF radiation.

From the international patent application Nr. WO 2004/109614 a security system is known, which comprises indoor and outdoor infrared sensors. The infrared sensors are connected to a control unit, wherein the control unit has a function to activate sound and light signals, a device capable for video recording and a tear gas sprayer. The individual units of the system stay in connection by means of wiring or through wireless connections (by electromagnetic waves).

Patent application Nr. JP 2003/051078 describes a burglar prevention system that can be used for inhibiting an intended crime with the aid of tear gas spraying. This apparatus is equipped with a sensor unit, an alarm unit and a unit for inhibiting an intended crime, i.e. a tear gas sprayer unit.

The security system in document US 2010/0128123 includes a video system for capturing images of an intruder entering a closed indoor space and an actuator module which, in response to the alert signal of the video system, initiates a deterrent dispensing device. Main function of the deterrent dispensing device is to spray a gas into the atmosphere which inhibits the intruder in his actions, wherein the dispensing device can be activated by a local processor or from a remotely located monitoring station.

Document DE 4133110 shows a security system for indoor spaces operated with the aid of a tear gas sprayer in which the tear gas dispenser or gas release mechanism is actuated by an electromotor. The electromotor drives an activating arm capable of pushing the sprayer pump of a sprayer bottle.

The electronic home protection apparatus of the present invention forms part of an electronic protection system. The electronic protection apparatus is controlled by a central control unit or communication unit and a central alert unit is connected to the central control unit by wiring or through wireless connection. The apparatus comprises at least one mobile unit. The connection between the at least one mobile unit and the central alert unit is established by the central control unit (or communication unit). Communication between the central control unit and the at least one mobile unit is effected by means of a wireless type connection. The mobile unit comprises a passive infrared motion sensor, a microwave motion sensor and at least one sprayer bottle and a respective opening device attached to the sprayer bottle.

According to a preferred embodiment of the present invention the mobile units may contain a gas sensor which may provide health monitoring functions.

The apparatus of the present invention (comprising the central control unit and the mobile unit(s)) preferably may be installed as part of a larger home protection system, which means that already existing, previously installed systems can be extended with the apparatus of the present invention and its functions.

In buildings which have a built in air condition, ventilation or exhaust gas system the central control unit and the central alert unit can be connected to the control unit of said air condition, ventilation or exhaust gas system. As a consequence, the control of the air-condition or exhaust gas system can be overruled by the central control unit of the home protection apparatus to stop ventilation in the event of an intrusion when high concentration of an irritating gas - or a gas hindering clear sight - has to accumulate in an indoor area to inactivate intruders. Further, enhanced exhaust gas elimination can be activated when the system operates in health monitoring mode and suction of e.g. CO (carbon monoxide) is urgently needed.

In a further preferred embodiment of the electronic home protection apparatus of the present invention communication and data transfer between the at least one mobile unit and the central control unit is established via radio frequency signals.

In a further preferred embodiment of the electronic home protection apparatus the mobile unit is connected to the central control unit through wiring.

In another preferred embodiment of the electronic home protection apparatus the central control unit and the central alert unit are connected to a siren output of the electronic protection system through wiring.

In another preferred embodiment of the electronic home protection apparatus the central control unit is connected to a PGM port of the central alert unit.

In another preferred embodiment of the electronic home protection apparatus the mobile unit is provided with sabotage protection.

In a further preferred embodiment of the electronic home protection apparatus a sabotage protection of the mobile unit is connected to a zone input port of the central alert unit with the interconnection of the central control unit.

In a further preferred embodiment of the electronic home protection apparatus the central control unit is connected to the 12 V power supply of the central alert unit by wiring.

In a preferred embodiment of the electronic home protection apparatus the power supply of the at least one mobile unit is provided by a battery.

In the mobile unit of the electronic home protection apparatus of the present invention the sprayer bottles are placed into a bottle holder and according to a preferred arrangement at least one, preferably two, more preferably integral multiple of two bottles are biased against a nozzle in the housing of the mobile unit by a clamping screw, a servo-motor holder is permanently fixed to the housing of the mobile unit, the servo-motor holder has a prismatic shape and is configured to be able to guide a bottle displacing bracket, to the grooved shaft of the servo-motor arranged in the servo-motor holder there is connected a lower pulley by half screwed and press fit connection, and an upper pulley is connected to the bottle displacing bracket.

The present invention also relates to a method carried out by means of the above electronic home protection apparatus.

The electronic home protection apparatus is hereinafter described in more detail with reference to the attached drawing, wherein in Fig. 1 the block diagram of the electronic protection apparatus is shown schematically, in Fig. 2 the first embodiment of the valve opening device is shown in perspective view, in Fig. 3 second embodiment of the valve opening device is shown in perspective view.

In Fig. 1 the electronic home protection apparatus is shown as part of an electronic home protection system installed in a closed room or indoor area. The 1 central alert unit of the electronic protection apparatus is connected by wires to a 2 central control unit. The 1 central alert unit communicates via RF waves with at least one 3 mobile unit having a built in passive infrared (PIR) and a microwave motion sensor. In the 3 mobile unit at least one, preferably two, more preferably integral multiple of two 10 sprayer bottles are placed. A 4 or 1 1 valve opening device is operatively connected to the 10 sprayer bottle.

Functions of the 1 central alert unit (or central protection unit) are the following:

(a) establishes connection between sensors of a building sensing intrusion in different areas of the building and a remote telemonitoring facility receiving the alert signal, or between the device emitting the alert signal (such as a siren);

(b) processing signals transmitted by sensors sensing intrusion in different areas of the building, and according to a previously written program (or protocol) the alert procedure is disabled (alert system becomes inactivated) or activated;

(c) in the course of the activated alert procedure signals are sent to the remote telemonitoring facility through various output interfaces (PGM, telephone) of the 1 central alert unit, the 1 central alert unit activates the siren, and sends a command through the 2 central control unit to activate the 4 or 1 1 valve opening device of the 3 mobile units.

Functions of the 2 central control unit or communication unit are the following:

(a) establishes connection between the 3 mobile units and the 1 central alert unit. This connection is realized in a two way communication channel, i.e. the 2 central control unit may transmit signals from the 1 central alert unit towards the 3 mobile units, and may transmit signals from the 3 mobile units towards the 1 central alert unit. The 2 central control unit is connected to the 1 central alert unit always by wiring and the power supply required for its operation is provided by the power supply of the 1 central alert unit. Signals are transmitted from the 1 central alert unit towards the 3 mobile units through various output interfaces (PGM, telephone) of the 1 central alert unit with the interposition of the 2 central control unit. Signal transmission between the 3 mobile units and the 2 central control unit may be effected by wired connection or by RF electromagnetic waves;

(b) in case of activation of the alert program it controls the operation of a built in air condition, ventilation or exhaust gas system of the building. Functions of the 3 mobile units are the following:

(a) dispensing tear gas or irritant gas content of the 3 mobile units into the atmosphere;

(b) the dual motion sensor system of the 3 mobile units senses every movement within the protected area. The dual motion sensor system comprises a short range (approx. 3 to 5 m) infrared sensor (PIR) and a long range (approx. 10 to 17 m) microwave motion sensor. Goal of the dual motion sensor system is to mitigate the risk of a false alarm and the consequent unnecessary gas emission;

(c) various sensors built into the 3 mobile units for detecting harmful gases (e.g. CO) or gases causing dazing effect can measure the concentration of emitted gases in the atmosphere and send an alert signal through the 2 central control unit towards the 1 central alert unit. At the same time the siren mounted into the 3 mobile units is also turned on;

(d) by pushing a panic button in the 3 mobile units signals are sent through the 2 central control unit towards the 1 central alert unit, and the 1 central alert unit further transmits signals to the telemonitoring facility.

In Fig. 1 the block diagram of the electronic protection apparatus is shown schematically, where the 2 central control unit is connected by wiring to the 5 siren output port and a 7 zone input port of the 1 central alert unit and to the 8 power supply with 12 V output voltage. The electronic protection apparatus may have more alerting outputs. The most common is a siren output. For an apparatus having a PGM output port the 2 central control unit can be connected to the 6 PGM data output port of the 1 central alert unit. Transmission of the alerting signal is effected through the 6 PGM data output port towards the 1 central alert unit.

Sabotage protection is connected to the 7 zone input port. Did any sabotage event happen, e.g. when the housing of the 2 central control unit has been opened or the 3 mobile units have been opened, e.g. in order to remove the 10 sprayer bottles, the 3 mobile unit or mobile units send a signal to the 1 central alert unit notifying it about a suspected override and the 1 central alert unit activates a sabotage alarm program. Activation of the sabotage alarm program does not take place if prior to the opening of the housing of the 2 central control unit or the 3 mobile units a maintenance authentication code has been entered into the 1 central alert unit. The 1 central alert unit decides whether unauthenticated action has taken place or not. If the 1 central alert unit detects any unauthenticated action it activates an alarm program (including activation of siren and the 3 mobile units, call of the telemonitoring facility etc.).

As a consequence of an unauthorized intrusion into a protected indoor area the 1 central alert unit is brought to an activated state, and as a result the 1 central alert unit sends an alarm signal through any of its output ports (5 siren output port, 6 PGM output port) towards the 2 central control unit. The 2 central control unit activates the 3 mobile units via RF waves. If the passive infrared (PIR) sensor and the microwave motion sensor sense any motion in the area the 4 valve opening device gets activated and dispenses the content of the 10 sprayer bottle into the atmosphere, thereby the intruder is limited in clear sight and easy breath.

The at least one 3 mobile unit can be arranged within the common range of RF transceivers with a wide range of freedom. It can be operated from its own power source, e.g. from a 1 1 battery, and accordingly it is provided with a battery charger connection. The user is visually and permanently informed about the output voltage of the 1 1 battery by a LED diode built into the 3 mobile units.

In the 3 mobile units preferably two commercially available 10 sprayer bottle are placed which can be owned without permission. The 3 mobile units can be disassembled and replacement of the 10 sprayer bottles can easily be performed.

The 3 mobile units are provided with sabotage protection. In case of any sabotage event, e.g. disassembling, the 3 mobile units send an RF signal towards the 2 central control unit which transmits a sabotage signal to the 1 central alert unit.

In Fig. 2 the first preferred embodiment of the 4 valve opening device is shown in perspective view. In the 3 mobile units the 10 sprayer bottles are placed into a 41 bottle holder, and the 10 sprayer bottles are biased by 42 clamping screws against a 43 nozzle arranged in the 45 housing of the 3 mobile unit. A 44 servo-motor holder is permanently fixed to the 45 housing of the 3 mobile unit. The 44 servo-motor holder has a prismatic shape and is configured to be able to guide a bottle displacing 46 bracket. To the grooved shaft of a 47 servo-motor arranged in the 44 servo-motor holder there is connected a 49 lower pulley by half screwed and press fit connection, and a 48 upper pulley is connected to the bottle displacing 46 bracket.

The 41 bottle holder is configured to be able to flood both smaller rooms and larger halls with suitable gases, thus it is able to receive bigger size 10 sprayer bottles. Valve stems of different size can be engaged to the 43 nozzle. The above constructional elements can be manufactured of e.g. plastic using any of the common injection molding techniques.

During operation of the first embodiment of the 4 valve opening device the grooved shaft of the 47 servo-motor placed in the 44 servo-motor holder transmits turning moment to the screwed and the press fitted half 49 lower pulley, the latter turning to direction A. As a result of said turning moment the 48 upper pulley that is connected to the bottle displacing 46 bracket is displaced in axial direction B with respect to the 49 lower pulley. Since the 48 upper pulley and the bottle displacing 46 bracket are connected the relative movement of the bottle displacing 46 bracket and the 10 sprayer bottles connected thereto with respect to the 45 housing of the 3 mobile unit is the same as the axial displacement of the 48 upper pulley. As an outcome of the movement of the 10 sprayer bottles in direction B the valve of the bottle is brought to an open state and the gas staying under pressure is discharged through the 43 nozzle in the form of a C spray.

In Fig. 3 the second preferred embodiment of the 1 1 valve opening device is shown in perspective view. The second embodiment is used predominantly in case of larger volume 119 sprayer bottles. It is conceivable to have a realization of the first embodiment of the 4 valve opening device capable of opening 1 19 sprayer bottles with diameter equal to or smaller than 36 mm, and to have a realization of the second embodiment of the 1 1 valve opening device capable of opening 1 19 sprayer bottles with diameter larger than 36 mm. In the second embodiment 119 sprayer bottles are placed into a 1 110 bottle holder in the 3 mobile unit. The 1 19 sprayer bottles are biased by 11 1 1 clamping screws with the aid of elastic force of 1 13 spiral springs towards a 1 1 1 nozzle connected to a bottle displacing 118 bracket. To the taper hole of the 1 1 1 nozzle 1112 valve stems of the 1 19 sprayer bottles are engaged. The 1 14 servo-motor holder is permanently fixed to the 1 12 housing of the 3 mobile unit. The 1 14 servo-motor holder has a prismatic shape and is configured to be able to guide a bottle displacing 1 18 bracket. To the grooved shaft of a 115 servo-motor arranged in the 1 14 servomotor holder there is connected a 1 16 lower pulley by half screwed and press fit connection, and a 1 17 upper pulley is connected to the bottle displacing 1 18 bracket. The above constructional elements can be manufactured of e.g. plastic using any of the common injection molding techniques.

During operation of the second embodiment of the 1 1 valve opening device the grooved shaft of the 1 15 servo-motor placed in the 1 14 servo-motor holder transmits turning moment to the screwed and the press fitted half 1 16 lower pulley, the latter turning to direction A. As a result of said turning moment the 117 upper pulley that is connected to the bottle displacing 1 18 bracket is displaced in axial direction B with respect to the 1 16 lower pulley. Since the 1 17 upper pulley and the bottle displacing 118 bracket are connected the bottle displacing 118 bracket and the 1 1 1 nozzle connected thereto are moved towards the 1 19 sprayer bottle against the elastic force of the 1 13 spring and the force required to open the 1 12 valves of the 1 19 sprayer bottle and thus the 119 sprayer bottle is brought to an open state and the gas under pressure is discharged through the 43 nozzle in the form of a C spray.

Main difference between the first and second embodiments is that the second embodiment can be used for larger volume 1 19 sprayer bottles whereas a motor with the same electric power can be applied. The reason for this is that the 1 17 upper pulley has to overcome during its movement only the force required to open the valves of 1 19 sprayer bottles and there is no need to overcome gravitation force associated with the 1 19 sprayer bottles. Further advantage of the second embodiment is that the 1 19 sprayer bottles do not move and consequently they can be permanently fixed to the 1 12 housing of the 3 mobile unit in every situation where it is needed.

Installment of the home protection apparatus:

The two essential units of the present invention (the 2 central control unit and the 3 mobile unit(s)) must be connected in every case to a 1 central alert unit of an electronic home protection system. When a protection system of a building is being installed it is possible to solve the problem of detection or surveillance of any motion in indoor spaces or rooms exclusively by the dual motion sensors (PIR + microwave) built into the 3 mobile units. When a protection system of a building has already been set up earlier, then the present electronic protection apparatus can be added as a supplementary unit to the existing system. The 3 mobile units can be mounted and fixed on walls with the aid of consoles or can be arranged in an open area on any horizontal surface.

Operation of the home protection apparatus:

1. Safety function

The microwave motion sensor of the dual motion sensor arranged in the 3 mobile units is detection of any motion in the major part of the area monitored or surveyed. The small range PIR motion sensor has to detect any person approaching the 3 mobile unit. When motion is detected (by microwave or microwave + PIR or only PIR) the 3 mobile unit emits and sends a signal to the 1 central alert unit through the 2 central control unit. In systems where motion sensors, door opening sensors, breakage sensors etc. have already been settled, the alert signal may be received by the 1 central alert unit from these existing sensors. Following the alert signal received by the 1 central alert unit the 1 central alert unit performs actions in accordance with its actual status that can be enabled or disabled. In the event the zone where the signal originates from is not enabled the alert program is not started by the 1 central alert unit. In the event the zone where the signal originates from is enabled the 1 central alert unit performs actions according to the alert protocol programmed into the unit. The two essential units of the present invention (the 2 central control unit and the 3 mobile unit(s)) perform the following actions during the alert program or protocol:

(i) the signal from the 1 central alert unit is received by the 2 central control unit; (ii) alert signal is sent from the 2 central control unit by means of RF signals to every 3 mobile unit, as a result of this signal the 3 mobile units put voltage on the control electronics of the 4, 11 valve opening device;

(iii) in case both sensors (the microwave and PIR sensors) of the 3 mobile unit sense any motion the 4, 1 1 valve opening device gets activated and the content of the sprayer 10, 1 19 bottles is dispensed into the atmosphere.

(iv) in buildings with built in air condition, ventilation or exhaust gas system operation of those parts of the ventilation system which extend through the actual alert zone is shut down by the 2 central control unit in response to the alert signal of the 1 central alert unit; the tear gas content discharged by the 3 mobile units is kept in the protected area; and after a predetermined period of time the air condition, ventilation or exhaust gas system is restarted by the 1 central control unit and exhaustion of gases from the area happens at the highest available rate.

(v) a gas sensor is built into each 3 mobile unit, which is able to sense the presence of harmful gases or gases with dazing effect in the air by; if concentration of such gases reaches a certain limit the sound alarm installed into the 3 mobile units and having at least 85 dB amplification is activated; and parallel with the previous action the 2 central control unit sends an alert signal to a remote telemonitoring facility.

2. Health monitoring function

(a) a replaceable gas sensor (e.g. electrochemical) is built into each 3 mobile unit, which is able to sense the presence of harmful gases (e.g. carbon monoxide) in the air by. If concentration of e.g. carbon monoxide in air reaches a certain limit, the sound alarm installed into the 3 mobile units and having at least 85 dB amplification is activated and parallel with the previous action the 2 central control unit sends an alert signal to a remote telemonitoring facility.

(b) a panic button is installed into the 3 mobile units and by pressing this button the user can send an alarm signal through the 2 central control unit to the remote telemonitoring facility. The present invention has several advantages over the prior art.

Main advantage is that the 3 mobile units operate at local level, i.e. due to the passive infrared motion sensors the 3 mobile units get activated only in case their close neighborhood is approached by an intruder and their content - a gas irritating the human mycoderm - is dispensed directly to the face of the intruder and as a consequence of exposure to the irritating gas the intruder is disturbed in clear sight and easy breath. Further, the 3 mobile units can be installed in any number in a given room, even in the vicinity of valuable objects. Further advantage is that the 3 mobile units can be used not only in indoor areas but in outdoor spaces for protection of valuable objects and can be placed e.g. next to doors or windows.

Considerable advantage of the apparatus is that in case of areas requiring strict protection and defense (military objects, rooms for storing confidential data, bank safes etc.) narcotic or anesthetic gas can be dispensed into said area which makes possible not only to deterring intruders but to catch them. The valve is open until relevant signal of the 1 central alert unit. Further the 2 central control unit can be applied as a supplementary tool to operatively cooperate with 1 central alert units used in the relevant technical field since it is provided with various connection ports (can be connected to the 5 siren output port or the 6 PGM data output port of the 1 central alert unit). In the 3 mobile units such commercially available 10, 1 19 sprayer bottles are placed which can be owned without permission.

Claims

1. Electronic protection apparatus comprising a central control unit (2), wherein a central alert unit (1) is connected to the central control unit (2) by wiring, and the apparatus further comprising at least one mobile unit (3) where data transmission between the mobile unit (3) and the central alert unit (1) is effected through the interconnection of the central control unit

(2) , and wherein communication between the central control unit (2) and the at least one mobile unit (3) is established through a wireless communication channel, and the mobile unit

(3) comprises a passive infrared motion sensor and a microwave motion sensor and at least one sprayer bottle (10, 1 19) and a respective opening device (4, 1 1) attached to the sprayer bottle (10, 119).

2. Electronic protection apparatus according to claim 1 characterized in that the mobile unit (3) is provided with a gas sensor.

3. Electronic protection apparatus according to claim 1 characterized in that the electronic protection apparatus is part of a larger electronic protection system.

4. Electronic protection apparatus according to claim 1 characterized in that in buildings with built in air condition, ventilation or exhaust gas system the central control unit (2) and the central alert unit (1) are connected to the control unit of said air condition, ventilation or exhaust gas system.

5. Electronic protection apparatus according to claim 1 characterized in that a valve opening device (4) placed within the housing (45) of the mobile unit (3) comprises a bottle holder

(41), at least one sprayer bottle (10) placed into the bottle holder (41), the at least one bottle (10) is biased against a nozzle (43) in the housing (45) by clamping screws (42), a servomotor holder (44) is permanently fixed to the housing (45), the servo-motor holder (44) is configured to be able to guide a bottle displacing bracket (46), to the grooved shaft of the servo-motor (47) arranged in the servo-motor holder (44) there is connected a lower pulley (49) by half screwed and press fit connection, and an upper pulley (48) is connected to the bottle displacing bracket (46).

6. Electronic protection apparatus according to claim 1 characterized in that a valve opening device (1 1) comprises a bottle holder (1 1 10) and sprayer bottles (1 19) placed therein, the sprayer bottles (119) are biased by clamping screws (1 1 1 1) with the aid of elastic force of spiral springs (113) towards a nozzle (11 1) attached to a bottle displacing bracket (118), valve stems (1 1 12) of the sprayer bottles (119) are engaged to the taper hole of the nozzle (1 1 1), the servo-motor holder (1 14) is permanently fixed to the housing (1 12) of the mobile unit (3), the servo-motor holder (1 14) is configured to be able to guide a bottle displacing bracket (1 18), to the grooved shaft of the servo-motor (1 15) arranged in the servo-motor holder (1 14) there is connected a lower pulley (1 16) by half screwed and press fit connection, and an upper pulley (1 17) is connected to the bottle displacing bracket (1 18).

7. Method performed by the apparatus of any of claims 1-6, comprising the steps of:

- sensing any motion in the major part of the monitored area by means of the microwave motion sensor of the mobile units (3), sensing a person moving in the vicinity of the mobile unit (3) by means of the short range PIR sensor,

- in the event of any motion sending a signal by the mobile unit (3) through the central control unit (2) to the central alert unit (1),

- the central alert unit (1) performs the relevant alert program, wherein according to the alert protocol the central control unit (2) and the mobile units (3) have the following functions:

(i) the signal from the central alert unit (1) is received by the central control unit (2);

(ii) alert signal is sent from the central control unit (2) through RF signals to every mobile unit (3), as a result of this signal the mobile units (3) put voltage on the control electronics of the valve opening device (4, 1 1);

(iii) in case the microwave and PIR sensors of the mobile unit (3) sense any motion the valve opening device (4, 1 1) gets activated and the content of the sprayer bottles (10, 1 19) is dispensed into the atmosphere.

8. A method according to claim 7, further comprising the following steps:

(iv) in buildings with built in air condition, ventilation or exhaust gas system operation of those parts of the ventilation system which extend through the actual alert zone is shut down by the central control unit (2) in response to the alert signal of the central alert unit (1);

(v) we keep tear gas content discharged by the mobile units (3) in the protected area;

(vi) after a predetermined period of time the air condition, ventilation or exhaust gas system is restarted by the central control unit (1), exhaustion of gases from the area happens at the highest available rate.

9. A method according to claim 7, further comprising steps with health monitoring functions: (i) sensing the presence of harmful gases or gases with dazing effect in the air by a gas sensor built into the mobile units (3);

(ii) if gas concentration reaches a certain limit the sound alarm installed into the mobile units (3) is activated;

(iii) at the same time with step (ii) the central control unit (2) sends an alert signal to a remote telemonitoring facility.