Abstract: A detector assembly for a duct of a heating ventilation and air conditioning system includes an outer housing having at least one through hole formed therein, an inner sampling support receivable within a hollow interior of the outer housing, and at least one detector mounted to the inner sampling support. The at least one detector is axially aligned with the at least one through hole when the inner sampling support is installed within the hollow interior of the outer housing. The at least one detector is operable to sample air within the duct to detect a hazardous condition.

Abstract: A chamberless smoke detector includes at least one light emitter and at least one light receiver and a transparent sheet above the at least one light emitter and the at least one light receiver.

Abstract: A smoke detector for an air duct includes a photoelectric detection system and an air flow pathway in fluid communication with the air duct. The air flow pathway includes an inlet, an optic tube, and an outlet. The photoelectric detection system includes a circuit board having at least one light emitter and at least one light receiver mounted thereon. The optic tube passes through the circuit board and between the at least one light emitter and at least one light receiver.

Abstract: A detector assembly for a duct of a heating ventilation and air conditioning system includes an outer housing having at least one through hole formed therein, an inner sampling support receivable within a hollow interior of the outer housing, and at least one detector mounted to the inner sampling support. The at least one detector is axially aligned with the at least one through hole when the inner sampling support is installed within the hollow interior of the outer housing. The at least one detector is operable to sample air within the duct to detect a hazardous condition.

Abstract: A smoke detector for an air duct includes a photoelectric detection system and an air flow pathway in fluid communication with the air duct. The air flow pathway includes an inlet, an optic tube, and an outlet. The photoelectric detection system includes a circuit board having at least one light emitter and at least one light receiver mounted thereon. The optic tube passes through the circuit board and between the at least one light emitter and at least one light receiver.

Abstract: A smoke detector for an air duct includes a photoelectric detection system and a sampling space in fluid communication with the air duct wherein the sampling space is enclosed by a removable sampling space enclosure having an optic window, and the photoelectric detection system is located adjacent to the optic window. The sampling space enclosure can be removed or replaced without removing or replacing the entire smoke detector.

Abstract: A detector assembly for a duct of a heating ventilation and air conditioning system includes an outer housing having at least one through hole formed therein, an inner sampling support receivable within a hollow interior of the outer housing, and at least one detector mounted to the inner sampling support. The at least one detector is axially aligned with the at least one through hole when the inner sampling support is installed within the hollow interior of the outer housing. The at least one detector is operable to sample air within the duct to detect a hazardous condition.

Abstract: Open-chamber smoke detector and detection method. An elecromagnetic emitter emits radiation, a sensor receives the signal after it has travelled through the monitored area and analyses it to determine whether smoke is present by comparison with a reference signal representative of a smoke plume. An alarm condition is signaled when an evolution in the obtained data corresponds to the reference profile within a threshold amount.

Abstract: Open-chamber smoke detector and detection method. An elecromagnetic emitter emits radiation, a sensor receives the signal after it has travelled through the monitored area and analyses it to determine whether smoke is present by comparison with a reference signal representative of a smoke plume. An alarm condition is signaled when an evolution in the obtained data corresponds to the reference profile within a threshold amount.