A system for detecting a fire or overheating event includes a heat detector, an optical fiber, a photodetector, and a processing unit. The pneumatic heat detector includes a sealed chamber sealed with a diaphragm having an initial position, and the optical fiber is in operable communication with the diaphragm. The optical fiber includes a Fiber Bragg Grating (FBG). The optical signal generator is configured to emit an optical signal with into the optical fiber. The photodetector is configured to receive a reflected optical signal from the FBG. The processing unit is configured to correlate the reflection wavelength of the reflected optical signal with a temperature of the heat detector.

A method of manufacturing an overheat or fire alarm detection system, comprises the steps of micromachining a pressure sensor and securing a sensor tube in fluid communication with the pressure sensor. The sensor tube may comprise a hollow tube containing a material that evolves gas upon heating. The micromachining step may comprise doping at least a portion of a first layer, forming a cavity at least partially within the doped portion and forming a deformable diaphragm over the cavity.

A method of manufacturing an overheat or fire alarm detection system, comprises the steps of micromachining a pressure sensor and securing a sensor tube in fluid communication with the pressure sensor. The sensor tube may comprise a hollow tube containing a material that evolves gas upon heating. The micromachining step may comprise doping at least a portion of a first layer, forming a cavity at least partially within the doped portion and forming a deformable diaphragm over the cavity.

A pneumatic sensing apparatus for use in an overheat or fire alarm system includes a sensor tube containing a pressurized gas in communication with a pressure sensor configured to sense a temperature variation based on changes of the pressurized gas. A pressure switch is coupled to the pressure sensor. The pressure switch includes a signal transducer configured to provide an output indicative of an overheat or fire alarm condition.

A pneumatic sensing apparatus for use in an overheat or fire alarm system includes a sensor tube containing a pressurized gas in communication with a pressure sensor configured to sense a temperature variation based on changes of the pressurized gas. A pressure switch is coupled to the pressure sensor. The pressure switch includes a signal transducer configured to provide an output indicative of an overheat or fire alarm condition.

A system (10) and method (100) for detecting and suppressing a dust explosion occurring in a process enclosure (12). A sensor (14) generates a pressure signal indicative of a pressure within the enclosure (12). A processing element (16) analyzes the signal to determine whether the dust explosion is occurring. The signal is sampled at a higher frequency, and then converted to a lower frequency by averaging, then filtered with first and intermediate filters to remove portions of the signal having rates of increase that exceed pre-established maximum magnitudes, and then filtered with a second filter having an appropriate cut-off frequency, stop band attenuation factor, and end of passband frequency. An alarm and a suppression system (18) are activated if a static pressure exceeds a limit, a rate of pressure increase exceeds a limit, or a total suppressed pressure exceeds a limit, each of which indicates occurrence of the dust explosion.

A pneumatic detection system and a method of forming the pneumatic detection system are described. The system includes a sealed tube, a refrigerant disposed within the sealed tube, and a switch configured to be activated based on a specified pressure being reached within the sealed tube.

A pneumatic detection system and a method of forming the pneumatic detection system are described. The system includes a sealed tube, a refrigerant disposed within the sealed tube, and a switch configured to be activated based on a specified pressure being reached within the sealed tube.

A water-powered residential fire suppression and alarm system is provided. The system comprises a sprinkler head, a water-powered alarm, a fire-resistant transfer line assembly, and a housing assembly. The sprinkler activates upon excessive heat. The transfer line assembly provides an unclosable channel connecting an existing residential water fixture with the sprinkler head. The transfer line assembly includes a fire-resistant transfer line connected to a multi-port coupling which connects to the existing water fixture. The transfer line assembly also provides water to the alarm. The housing assembly has a housing with a vertical span of about 3-12 inches. The sprinkler head and alarm are mounted to the housing assembly and the transfer line assembly is connected to the housing assembly. When water is provided to the coupling and the sprinkler head activates, water flows through the transfer line, activating the alarm.

A water-powered residential fire suppression and alarm system is provided. The system comprises a sprinkler head, a water-powered alarm, a fire-resistant transfer line assembly, and a housing assembly. The sprinkler activates upon excessive heat. The transfer line assembly provides an unclosable channel connecting an existing residential water fixture with the sprinkler head. The transfer line assembly includes a fire-resistant transfer line connected to a multi-port coupling which connects to the existing water fixture. The transfer line assembly also provides water to the alarm. The housing assembly has a housing with a vertical span of about 3-12 inches. The sprinkler head and alarm are mounted to the housing assembly and the transfer line assembly is connected to the housing assembly. When water is provided to the coupling and the sprinkler head activates, water flows through the transfer line, activating the alarm.