39results about How to "Improve alarm reliability" patented technology

A robust alarm system has an alarm controller adapted to input an alarm trigger and to generate at least one alarm drive signal in response. Alarm subsystems input the alarm drive signal and activate one or more of multiple alarms accordingly. A subsystem function signal provides feedback to the alarm controller as to alarm subsystem integrity. A malfunction indicator is output from the alarm controller in response to a failure within the alarm subsystems.

A portable alarm transmitter for compliance monitoring detects whether a user is wearing the device. If not, a special alarm signal is sent to the monitoring service provider so that remedial actions can be taken. The alarm transmitter comprises a motion sensor, and an algorithm thereby for detecting whether the alarm device is being worn by the user. The alarm transmitter distinguish between non-compliance (e.g. user has taken off the alarm device) versus other “activities of daily living (ADL) that may appear to be non-compliance events (e.g. sleeping) by incorporating user stimulus and user response.

The invention relates to an overheating protective device comprising a plastic element (2) and an elastic auxiliary component which further comprises a support and a spring (1), of which one end is connected to the support. The plastic element (2) is connected between the support and the spring (1) so that the spring (1) is in an energy storage state and is subjected to a tensile fracture at the time of overheating to release the energy of the spring (1). The spring (1) and the support are both provided with electrodes (5) for connection with an alarm, and the two electrodes (5) are in contact when the energy is released from the spring (1) so as to turn on the alarm. Compared with overheating protective devices in the prior art, the overheating protective device of the invention is low in cost, extensive in applicability, simple in structure, reasonable in layout, small in occupation space, high in normal temperature reliability and alarm reliability, fast in response speed and low in wrong touch rate.

The invention discloses an alarming device for a wire cutting machine spindle. The alarming device comprises guide rods, an alarming rod, a first broken wire detection unit, a relay unit, a PLC and an alarming unit, wherein the guide rods are arranged at the two ends of the wire cutting machine spindle; the two ends of the alarming rod are respectively fixed on the guide rods; the first broken wire detection unit is arranged at one end of the wire cutting machine spindle; the relay unit, the PLC and the alarming unit are arranged in a control cabinet of the wire cutting machine; the relay unit is electrically connected with the first broken wire detection unit; the wire cutting machine is integrally connected with a power cathode; the alarming rod is connected with a power anode; under a normal condition, the relay unit can continuously send a signal to PLC through a normally-closed contact; when the wire net of the wire cutting machine is broken, the broken wire head falls onto the alarming rod, the whole wire cutting machine and the alarming rod are formed into a circuit loop, the signal is sent to the relay unit through the first broken wire detection unit, the normally-closed contact of the relay unit is disconnected and the PCL cannot receive the signal sent by the relay unit, so that the alarming unit is controlled to alarm. The alarming device utilizes the circuit connection / disconnection principle to alarm, so that the alarming is higher in reliability and is more sensitive.

The invention comprises a main switch box, multi data / power buses, multi intelligent encoded temperature sensors and multi line type temperature sensing unit. The provided intelligent bus is parallel-connected to the thermosensitive line type temperature fire sensor; each intelligent encoded temperature sensor is connected to a line type temperature senor so as to reduce the distribution density of the intelligent encoded temperature sensor. The invention can sense the fire in small size.

The invention discloses a detection method and a gas alarm. The method is applied to a gas alarm. The gas alarm has a detection unit for receiving button operations. The method includes: detecting at the first moment to obtain the second A button operation; judging whether a second button operation is detected within the preset time range from the first moment; if so, generating an alarm command based on the second button operation; executing the alarm command, and outputting An alarm signal reduces the frequency of false alarms caused by misoperation and improves the reliability of the alarm.

An explosion-proof steel cylinder with a pretensioned conductive wire and a setting method for the conductive wire. The explosion-proof steel cylinder is composed of a steel cylinder, a container valve, a conductive wire wound on the outer wall of the steel cylinder at intervals, and an alarm box connected to the measuring end of the conductive wire; the two ends of the conductive wire are fixed to the outer wall of the steel cylinder, and have a Tension force, its remaining elongation is lower than the breaking elongation of the steel cylinder, and an insulating layer is also provided between the conductive wire and the steel cylinder. The explosion-proof steel cylinder provided by the invention with the pretensioned conductive wire can effectively improve the explosion-proof alarm sensitivity by increasing the explosion alarm time difference, so the alarm reliability is high and the safety is good. In addition, the setting method is simple and easy.