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WO/1994/018653A1 |
A device (7) for testing the operation of smoke detectors (3) consists of a housing (1) open on one side which can be everted over the smoke detector (3) and in which there is a test light source (5) which can radiate pulsed light inside...
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WO/1993/025986A1 |
Apparatus for providing integrated test circuits for smoke detector (S1) is disclosed. The smoke detector (S1) operates such that products of combustion such as smoke and carbon monoxide cause the resistance across a sensor element (S1) ...
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WO/1993/022630A2 |
The invention concerns a device for testing the operability of a system for detecting heat-radiating, e.g. glowing or red-hot, particles carried in a particle stream, the device having at least two detectors (5) spaced a certain distance...
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WO/1993/015578A1 |
Not only to terminals such as repeaters, analog fire sensors and fire sensors fitted with addresses but also to the fire receivers to which the terminals are connected, given are address numbers. Further, to the signal sent out from the ...
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WO/1993/015577A1 |
A fire alarm having an extremely improved reliability of transmitting signals. In the fire alarm, through both first and second signal loops, whose transmission directions are opposite to each other, a fire receiver or a terminal sends o...
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WO/1993/015486A1 |
The proposal is for a receiving device for the reception of information transmitted wirelessly, especially with the aid of i/r light signals, in which the information is transmitted by a battery-operated transmitter having an indicating ...
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WO/1993/013401A1 |
A gas sample chamber (10) for use in a gas analyzer consists of an elongated hollow tube (21) having an inwardly-facing specularly-reflective surface (22) that permits the tube to function also as a light pipe for conducting radiation fr...
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WO/1993/011418A1 |
A gas sample chamber (10) for use in a gas analyzer consists of an elongated hollow tube (21) having an inwardly-facing specularly-reflective surface (22) that permits the tube to function also as a light pipe for conducting radiation fr...
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WO/1993/008550A1 |
A fire detector, for connection in a fire protection/alarm system, comprises an array of sensors, or a single sensor, of the semiconductor resistor type impregnated with a noble metal. The detector is responsive, by way of a decrease in ...
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WO/1993/006462A1 |
A smoke detector has a chamber (12) through which air or another gaseous medium in which smoke or other particles to be detected flows along a flow path (14). A light source (16) emits light into the chamber and a light sensor (20) recei...
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WO/1993/002510A1 |
An apparatus for monitoring and testing a twisted pair, particularly useful for an Ethanet network (fig. 3). First and second DC currents alternated with one another are applied to both ends of the line, asynchronously (fig. 29). By moni...
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WO/1993/000699A1 |
The invention provides an oscillatory suppression circuit (54) for use in a photosensor loop circuit (10) employing a phototransistor (14). The oscillation suppression circuit (54) prevents oscillation in the photosensor loop circuit (10...
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WO/1992/005527A1 |
A system and method for monitoring the location of an individual includes a band (10) attached to the individual that has a pressure actuated tamper indicator (100) and a monitoring/tracking unit (20) that may be used to both monitor whe...
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WO/1992/004758A1 |
The invention relates to the monitoring and testing of emergency systems (10) to ensure that they are at all times capable of performing their required emergency function. Emergency lighting systems (10) installed in buildings are requir...
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WO/1992/000240A1 |
An improved aerosol formulation for activating a smoke detector by emulating the effects of combustion products to test smoke detectors includes a propellant and an active ingredient consisting of one or more linear alkyl phthalate ester...
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WO/1991/014315A1 |
A system for the synchronization of encryption devices in a digital cellular communications system. Each of the encryption devices includes a multi-bit counter and generates a pseudo-random keystream which is combined with the data to be...
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WO/1991/009391A1 |
The invention relates to a control system for fire alarm installations and/or evacuation signalling installations with peripheral fire protection devices and a central fire alarm system, characterized in that the control system is incorp...
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WO/1991/006080A1 |
All known smoke alarms meant to be used at home have a serious problem, the battery gets too empty in secret. For instance a traveller just returned home does never know if the smoke alarm is ready for action. Most people forget to test ...
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WO/1991/000659A1 |
Test and measurement apparatus for testing a wristwatch pager (10) having an FM receiver (55) and a wristband antenna (14) coupled to the user's body. A monitor circuit (34) mounted on a watch-sized printed circuit board and its controll...
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WO/1990/013189A1 |
An electrical device has a power supply (32) which has a varying electrical condition. In response to the varying electrical condition equaling a predetermined electrical condition an indication is generated. The indication indicates the...
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WO/1990/012375A1 |
In order to oversee and plan, at overall shop level, the execution of maintenance work on several installations (1), each having monitoring equipment (3) which monitors the intervals at which maintenance should be carried out on the inst...
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WO/1990/009714A1 |
An alarm reporting system (1) includes a control unit (4) which services a supervised derived channel communicator (5), and a one-way radio transmitter (6) (preferably via the cellular telephone network), to provide for interactive opera...
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WO/1989/007814A1 |
A security system for an environment from which a power supply at a first voltage level is derived, said security system comprising a first electrical circuit including a capacitor which is adapted to store charge while the security syst...
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WO/1989/006412A1 |
A system for testing a remotely located sensing unit (10) includes a photosensor (20a) located within the sensing unit (10). A control beam of incident electromagnetic energy (8a) can be provided from a remotely located portable source s...
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WO/1989/004029A1 |
An intrusion detector (2) has a sensor (4) which is responsive to the vibration and tilting of an accessway, such as a door or window, brought about by the attempts of an intruder to gain entry to a premises. An alarm sounder (170) is ac...
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WO/1989/002635A1 |
A proximity sensor that employs an electrostatic sensing element (30) driven by an oscillator (26) is described, in which a disturbance of the electromagnetic field surrounding the sensing element is sensed by detecting small variations ...
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WO/1988/009024A1 |
A detector for sensing or measuring objects passing a measurement path (5) has a detection element (6), the output signal of which is a function of objects discovered in the measurement path. Said detection element catches radiation dire...
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WO/1988/007824A1 |
Information security box for safe storing and transportation of storage media which are information carriers. Security is achieved by erasing the information in the contained storage media if intruders attempt to gain admittance to the s...
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WO/1988/005581A1 |
Facility for the prevention of disasters which detects unconnected terminal devices as well as connected terminal devices of no interest, automatically stops monitoring the detected device in the object to be monitored and controlled, an...
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WO/1988/005580A1 |
Personal alarm system which comprises a portable transmitter unit (10) which is intended to be worn or to be manually carried by the user, and which is operable by the user at any particular location to transmit an alarm signal in an eme...
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WO/1988/003301A1 |
In a passive sensor of the type in which infrared energy emitted by an object inside a predetermined monitor field is detected by an infrared sensing element (6) and an alarm is sounded in response to the detection signal, the present in...
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WO/1988/003287A1 |
A computer security system (100) protects the computer software from unauthorized access and the computer hardware from unauthorized intrusion. At the start up (202) of the computer system (100), the computer's keyboard and diskette driv...
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WO/1988/001416A1 |
The ultra-violet flame detector with analog output firstly involves combining the application of a sensitive gas tube as relaxation device of which the cathode coating provides for the photoelectric effect which occurs in the light range...
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WO/1988/000412A1 |
Method and apparatus for monitoring that a plurality of mutually subsequent signals are of substantially the same appearance and, thereby, are substantially alike, and for triggering an alarm and/or stop function in the event of signal l...
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WO/1987/007418A1 |
A transmission circuit provided in a receiver or terminal equipment of a facility for preventing disasters in which the receiver effects the polling for each of many pieces of terminal equipment, reads terminal data from said terminal eq...
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WO/1987/001230A1 |
Circuitry for using the statistical properties of detected radiation in the time domain to discriminate between stimuli from fire and non-fire sources. Statistical discriminators for fire sensing may be combined with other types of senso...
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WO/1986/006859A2 |
A cross-correlation fire sensor circuit includes detectors (12, 14) responsive to heat and light radiation, respectively. Electrical signals (f1, f2) from the detectors are processed in two distinct channels through low pass filters (20,...
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WO/1986/000450A1 |
Method and system for sensing explosive fires by the parallel processing of signals derived from both electromagnetic radiation and mechanical wave energy simultaneously emanating from or near the source of these fires. This diverse-stim...
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WO/1985/003590A1 |
A ultrasound alarm installation, wherein ultrasounds are emitted continuously in an area under surveillance (R) and wherein a frequency shift due to the motion of an object, e.g. an intruder, is evaluated following the Doppler effect for...
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WO/1985/003589A1 |
The control of burglary alarms is performed by a device arranged within the alarm. The device makes sure that, during the installation and the operation of the alarm, its electric parameters are optimally adjusted. The divergences of sai...
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WO/1985/003591A1 |
In a ultra-sound alarm installation, wherein ultra-sound wave are continously emitted in a room under surveillance (R) and wherein a frequency shift due to an object movement, for example an intruder, is evaluated following a Doppler eff...
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WO/1985/002476A2 |
A fire detection system incorporating fiber optics and having a selectively energizable light source for applying light pulses to a fiber optics path and a one-way light transmitting element, such as a dichroic mirror (22), at the remote...
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WO/1985/001141A1 |
A test device for a multiple channel infra red detector utilizing photocells comprising an aperture plate mounted on the housing member of the detector. In the embodiment described a test lamp is mounted on a surface portion of the apert...
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WO/1984/002790A1 |
In a photoelectric smoke detector, a radiation source (2) is intermittently actuated by a control unit (1) and the radiation on which smoke particles have an influence, for example the diffused radiation, is picked up by a radioreceiver ...
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WO/1984/002216A1 |
A system for supervising a group of two or several localities and preferably residences. In each locality is provided a local equipment (A, B, C) having an alarm detector (2) for generating an alarm signal when a movement is sensed for e...
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WO/1984/001456A1 |
The invention relates to an electronic self-controlled alarm device. Set off conditions of the alarm are periodically established by varying alternatively into plus and into minus the resistance of the detection loop wherein are arranged...
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WO/1984/001431A1 |
A system for sensing (12) and annunciating (16) the presence at any one of a plurality of locations of accumulations of potentially hazardous gaseous and vapor mixtures prior to their reaching a lower explosive limit thereof. The system ...
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WO/1983/002187A1 |
A light extinction type smoke detector which uses simple pulse light or modulation pulse light to reduce energy consumption, and precisely discriminates smoke generated by fire from interruption of the light beam from the light source to...
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WO/1983/000558A1 |
Apparatus for detecting hazardous radiation with a light sensitive radiation receiving tube (24) enclosed in a housing (14) behind a transparent window (19), and including an auxiliary internal light source (30) positioned for transmitti...
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WO/1983/000179A1 |
Locking and unlocking system comprising a lock, respectively a combination lock, with several possibilities of actuation, which operate the opening and closing mechanism or several of such locking mechanisms. One or more of these possibi...
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