摘要:
An alarm device monitoring and control tool (1, 40) has a radiation transceiver (20) to locally communicate with alarm devices (50) within a building. It generates and transmits test instructions for the devices and receives and processes event data resulting from said instructions. This event data includes historical event data captured by the devices in real time, especially regarding signal strength and repeat levels for communication between individual devices. It can test reliability of wireless communication paths between devices in a group by sampling in the frequency band used to determine interference. Also, it can automatically convert between count values transmitted by a device and a real time stamp, allowing real time patterns to be monitored even though the device has a small processing and memory capacity without a real time clock.
摘要:
A wireless alarm device network (1) comprises alarm devices (A-J, L) each having a processor, a wireless communication interface, and a condition sensor. The devices are communicate by wirelessly transmitting messages, and in a learning mode, automatically register in a monitoring cluster according to received signal strengths. A device (A-J, K) recognises a device as being in its cluster if at least received signal strength exceeds a threshold. Each device is adapted to monitor each other device or devices in its cluster, and to generate an alert if it determines that a device in its cluster is not sending messages.
摘要:
A smoke alarm device has an interface (1) with a microprocessor (2), and transistors (3, 4) controlling a piezo horn (5). The microprocessor (2) is programmed to generate a test output record including various items of data such as the device's serial number, the battery level, a contamination level if it is an optical alarm, an event log, and an installation date. This information is encoded by control of the transistors (3, 4) in an acoustic output from the piezo horn (5) using an encoding technique akin to Morse code. The data is decoded by any electronic testing device having a microphone and a processing capability, such as a PDA, a laptop computer, or even a mobile phone. Devices with stereo microphones can also be used for better performance. If the device has a camera then it could both capture the acoustic signal and take an image of the alarm device to provide a more comprehensive record. In one example, a mobile phone downloads over a mobile network an application to do this processing. In order to do an audit it is only necessary for the technician to press a test button upon which the microprocessor (1) generates the acoustic signal with audit data. This acoustic signal is captured by the testing device and either decoded by that device or uploaded to a central host for decoding and further processing and storage.
摘要:
A smoke alarm modular base (10) contains an interconnect interface (30) for wireless communication with other devices in a group. An alarm device (1-7) is completed by push-fitting an alarm unit to the base (10). An antenna (15) is curved within a housing, or may be extended out through an aperture (16). The interconnect interface is activated when the alarm unit is pushed into place, by a protruding switch (25). Pressing of a house coding switch (28) of a number of devices in quick succession causes them to communicate a unique device identifier to each other so that a network group is automatically learned.
摘要:
An alarm device (1) has a circuit (10) with a microcontroller (11) which activates a green LED (4) to indicate normal operation, a yellow LED (6) to indicate if there is a fault, and a red LED (5) to indicate an alert arising from carbon monoxide concentration exceeding a volt. If the user presses a test/hush button (3) the microcontroller indicates the peak concentration since a memory was last reset. Continuing to press the button causes the memory to be reset. This provides peace of mind to the user.
摘要:
A gas sensor (1) has a reagent (5) of orange colour and which becomes darker in colour upon contact with CO. The reagent (5) is partially covered by a mask (6) which retards diffusion of contaminants to the reagent surface behind the mask. Thus, for example, if the exposed part becomes bleached by contaminants, CO will still be indicated as a dark line at the edge of the mask (6).
摘要:
A smoke alarm device has an ASIC (1) with an integrated photo detector (3) and control circuit. The photo detector output is compared every ten seconds with an alarm threshold level in a comparator circuit (10), with a sensitivity-decrease threshold in a comparator circuit (11), and with a sensitivity-increase threshold in a comparator circuit (12). A logic block (2) causes sensitivity to be increased or decreased in which decreases take place at intervals of six hours and increases take place after 40 secs. The logic block (2) provides for least sensitivity at power-up with rapid increases to the appropriate level according to the level of back-scatter caused by dust contamination. The logic block (2) maintains a high signal on an interconnect terminal (9) for four seconds after a test button (7) is pressed so that a maintenance person can hear remote interconnected devices after the local device has stopped sounding. The logic block (2) also stores a memory flag when is goes into alarm mode and modulates the horn at a different frequency at the next testing to indicate that it has historically sensed smoke since last tested.
摘要:
An alarm device 1 comprises a base (2) which is secured to a ceiling using screw fasteners (11). A mains cable (12) is trained in through the base (2) at an aperture (19) and electrical connections are made to a terminal block (14). An alarm body (3) is then electrically and mechanically connected to the base (2) by simply sliding it in the plane of the base (2) until electrical and mechanical connections are automatically made. The alarm body (3) may be separated to insert a back-up battery or for maintenance by initially releasing a safety catch using a screwdriver and pushing in the opposite direction.
摘要:
A controller (1) for a smoke, heat, and carbon monoxide alarm system automatically assigns one of a plurality of commands to a common user action button (10) press, according to circumstances. It assigns a test command if all of the alarm devices are in standby, a locate command if any of the alarm devices are alarming, and a hush command if its last command was a locate command. The processor activates output indicators to provide alarm condition information to a user, and there is a dedicated indicator (21-23) for each sensed condition. The processor controls the indicators (24-27) to inform the user of the command which would be assigned to a next button (10) press.