Alarms responsive to a single specified undesired or abnormal operating condition and not elsewhere provided for

GPHYSICS G08Signaling G08BSIGNALLING OR CALLING SYSTEMS ORDER TELEGRAPHS ALARM SYSTEMS

G08B21/00Alarms responsive to a single specified undesired or abnormal operating condition and not elsewhere provided for

G08B21/02Alarms for ensuring the safety of persons G08B21/0202Child monitoring systems using a transmitter-receiver system carried by the parent and the child G08B21/0205Specific application combined with child monitoring using a transmitter-receiver system G08B21/0208Combination with audio or video communication G08B21/0211Combination with medical sensor G08B21/0213System disabling if a separation threshold is exceeded G08B21/0216Alarm cancellation after generation G08B21/0219Circuit arrangements G08B21/0222Message structure or message content G08B21/0225Monitoring making use of different thresholds G08B21/0227System arrangements with a plurality of child units G08B21/023Power management G08B21/0233System arrangements with pre-alarms G08B21/0236Threshold setting G08B21/0238adding new units to the system G08B21/0241Data exchange details G08B21/0244System arrangements wherein the alarm criteria uses signal delay or phase shift G08B21/0247System arrangements wherein the alarm criteria uses signal strength G08B21/025System arrangements wherein the alarm criteria uses absence of reply signal after an elapsed time G08B21/0252System arrangements wherein the child unit emits G08B21/0255System arrangements wherein the parent unit emits G08B21/0258System arrangements wherein both parent and child units can emit and receive G08B21/0261System arrangements wherein the object is to detect trespassing over a fixed physical boundary G08B21/0263System arrangements wherein the object is to detect the direction in which child or item is located G08B21/0266System arrangements wherein the object is to detect the exact distance between parent and child or surveyor and item G08B21/0269System arrangements wherein the object is to detect the exact location of child or item using a navigation satellite system G08B21/0272System arrangements wherein the object is to detect exact location of child or item using triangulation other than GPS G08B21/0275Electronic Article Surveillance [EAS] tag technology used for parent or child unit G08B21/0277Communication between units on a local network G08B21/028Communication between parent and child units via remote transmission means G08B21/0283via a telephone network G08B21/0286Tampering or removal detection of the child unit from child or article G08B21/0288Attachment of child unit to child/article G08B21/0291Housing and user interface of child unit G08B21/0294Display details on parent unit G08B21/0297Robbery alarms G08B21/04responsive to non-activity G08B21/0407based on behaviour analysis G08B21/0415detecting absence of activity per se G08B21/0423detecting deviation from an expected pattern of behaviour or schedule G08B21/043detecting an emergency event G08B21/0438Sensor means for detecting G08B21/0446worn on the body to detect changes of posture G08B21/0453worn on the body to detect health condition by physiological monitoring G08B21/0461integrated or attached to an item closely associated with the person but not worn by the person G08B21/0469Presence detectors to detect unsafe condition, e.g.infrared sensor, microphone G08B21/0476Cameras to detect unsafe condition G08B21/0484Arrangements monitoring consumption of a utility or use of an appliance which consumes a utility to detect unsafe condition G08B21/0492Sensor dual technology, i.e. two or more technologies collaborate to extract unsafe condition G08B21/06indicating a condition of sleep G08B21/08responsive to the presence of persons in a body of water G08B21/082by monitoring electrical characteristics of the water G08B21/084by monitoring physical movement characteristics of the water G08B21/086by monitoring a perimeter outside the body of the water G08B21/088by monitoring a device worn by the person G08B21/10responsive to calamitous events G08B21/12responsive to undesired emission of substances G08B21/14Toxic gas alarms G08B21/16Combustible gas alarms G08B21/18Status alarms G08B21/182Level alarms G08B21/185Electrical failure alarms G08B21/187Machine fault alarms G08B21/20responsive to moisture G08B21/22responsive to presence or absence of persons G08B21/24Reminder alarms G08B21/245Reminder of hygiene compliance policies