9185 results about "False alarm" patented technology

An adaptive alarm system is responsive to a physiological parameter so as to generate an alarm threshold that adapts to baseline drift in the parameter and reduce false alarms without a corresponding increase in missed true alarms. The adaptive alarm system has a parameter derived from a physiological measurement system using a sensor in communication with a living being. A baseline processor calculates a parameter baseline from a parameter trend. Parameter limits specify an allowable range of the parameter. An adaptive threshold processor calculates an adaptive threshold from the parameter baseline and the parameter limits. An alarm generator is responsive to the parameter and the adaptive threshold so as to trigger an alarm indicative of the parameter crossing the adaptive threshold. The adaptive threshold is responsive to the parameter baseline so as to increase in value as the parameter baseline drifts to a higher parameter value and to decrease in value as the parameter baseline drifts to a lower parameter value.

A system and method for enabling a central station to accurately verify in real-time whether an alarm signal generated by a security base station is a false alarm, and for enabling remote users to securely access features of the security base station such as remote surveillance, activating and deactivating the system, and adjusting alarm sensitivities.

A security system that secures a building includes a weather detector for detecting weather conditions, such as thunder or high winds, which are likely to cause false alarms in sensors such as an acoustic glass break sensor, shock sensor and vibration sensor. The weather detector may include a sensing component that senses atmospheric conditions external to the building, such as temperature, pressure, wind speed and / or lightning. The weather detector may also include a component for receiving a data communication, such as from a radio, Internet, or telephone link, indicating that the weather condition is present in a vicinity of the building. The security system operates in a bad weather mode by requiring corroboration of intrusion detection signals from the sensors that can cause false alarms.

The invention relates to the technical field of monitoring of plunger pumps, in particular to a method for preventing evacuation of a plunger pump based on monitoring of the output pressure. The method relates to the plunger and an output pipeline, and is characterized in that a pressure data acquisition control device is arranged on the outlet pipeline; and a data processing method comprises the following steps that (1) the average value P0 of the output pressure is obtained, specifically, the output pressure setting tolerance delta P is set, the domain above a P0+delta P line is called a peak domain, and the domain below a P0-delta P line is called a valley domain; a peak domain counter A and a valley domain counter B are set correspondingly; the allowable difference value between the peak domain counter A and the valley domain counter B is the numerical value C; and an out-of-tolerance time counter D and an upper limit E are set; (2) pressure data Px is acquired; (3) abnormal data are removed; (4) the number of times of Px falling into the peak domain and the valley domain is calculated; and (5) whether the out-of-tolerance time D of the difference value between the peak domain counter A and the valley domain counter B exceeds a preset value E or not is judged, and if yes, an evacuation alarm is given out. Compared with a detection method in the prior art, the method is accurate and reliable, and false alarms are avoided.