Abstract: A gas detection device includes a housing, a top disk, an electrochemical sensor, a gasket, and an electrically resistive material, the top disk, electrochemical sensor, gasket and electrically resistive material are located in the housing and the electrically resistive material is located between the housing and the gasket, between the gasket and the top disk, or dispersed through the gasket.

Abstract: A multi-sense platform is provided and includes a first sensor, a second sensor and a controller disposed in signal communication with the first sensor and the second sensor. The controller is configured to determine a presence of a first type of gas based on readings of the first sensor and to distinguish between a first one of the first type of gas and a second one of the first type of gas based on readings of the second sensor.

Abstract: A heating, ventilation, and air conditioning (HVAC) system includes a closed loop refrigeration circuit including a heat exchanger assembly, a detection assembly operable to detect refrigerant from the closed loop refrigeration circuit mixed with air, a mitigation device operable to monitor at least one parameter associated with operation of the detection assembly and a controller operable to determine if an alarm generated by the detection assembly is a false alarm in response to the at least one parameter monitored by the mitigation device.

Abstract: A detection assembly operable to detect a refrigerant leak event includes a sensor network and a controller. The sensor network is operable to generate sensor outputs including triggering-sensor (TS) outputs and triggering-sensor context (TSC) outputs. The controller is operable to perform a sensor-reading context analysis on the sensor outputs. The sensor-reading context analysis includes accessing a set of the sensor outputs that occurred within a context time window, along with determining that a pattern of the set of sensor outputs represents the refrigerant leak event.

Abstract: An optical monitoring device includes a housing including a plurality of walls and an interior space disposed therebetween, an opening disposed in a wall of the plurality of walls, and a movable panel, the opening forms a window through the wall, and the movable panel is configured to be moved to access the interior space; a lamp assembly disposed within the interior space and positioned to project light at the window; a camera including an image receiving lens, the camera positioned within the interior space with the image receiving lens is in optical communication with the window; a memory storage device for storing image data; and a controller in electrical communication with the camera and the memory storage device, wherein the controller is configured to compare instant image data from the camera to image data stored on the memory storage device.

Abstract: A fire suppression system has a plurality of tank units (40, 42, 44, 46) each having: a tank body having a first port and an interior for storing at least one of fire suppressant and driver gas; a discharge assembly mounted to the first port and comprising: a discharge valve (50, 52); and a first monitoring switch or sensor (230; 240). A first monitoring unit (100) is coupled to the first monitoring switch or sensor of each said tank unit and configured to communicate with a remote monitoring location. For each of the tank units there is: a second monitoring switch or sensor (260, 280, 290); and a second monitoring unit (340) coupled to said second monitoring switch or sensor and configured to communicate with the remote monitoring location.

Abstract: A fire suppression system has a tank unit (40, 42, 44, 46). A tank body has a first port and an interior for storing at least one of fire suppressant and driver gas. A discharge assembly is mounted to the first port and has a discharge valve (50, 52) and a first monitoring switch or sensor (230 240) having a normally closed output (532) and a normally open output (534). A first monitoring system (100) is coupled to one of the normally closed output and the normally open output. A second monitoring system (340) is coupled to the other of the normally closed output and the normally open output.

Abstract: A photoacoustic detection system includes a detector that has a chamber, a pulsed light source, piezoelectric tuning forks, and a photosensor. The chamber has an inlet and an outlet for flow of an analyte. The pulsed light source is adjacent the chamber and is operable to emit a light beam along a path through the chamber. The tuning forks are arranged along the path, and each of the tuning forks is operable to emit first sensor signals. The photosensor is arranged along the path and is operable to emit second sensor signals. A controller is connected to receive the first and second sensor signals. The controller is configured to determine whether a target species is present in the analyte based on the first sensor signals and determine whether the target species is present in the analyte based on the second sensor signals.

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: Embodiments of the disclosure describe systems and methods for a portable fire alarm device. The device includes a sensing unit configured to a sensing unit configured to receive signals from at least one of on-board sensors and remotely located sensor devices to generate sensor related data. The device also includes an alert generation unit configured to generate an alert based on the sensor-related data indicating a potential fire hazard. The device also includes a power unit comprising at least a pluggable power interface to enable a connection of the portable fire alarm device with an Alternating Current (AC) outlet to supply power to the sensing unit and the alert generation unit to generate the alert. The device further includes an interface module configured to establish a connection with a communication module of another device to send the generated alert to one or more external electronic devices.

Abstract: A method of indicating the presence of a target gas in a gas volume comprising providing a gas sensing core, configured for detection of the target gas, and a condition sensor within the gas volume, providing a controller, allowing gas to fluidly interact with the gas sensing core, monitoring a target gas measurement output from the gas sensing core, monitoring a parameter output from the condition sensor, recording a parameter output minimum value, calculating a parameter difference, calculating a rate of change of the parameter with respect to time, and indicating the presence of a target gas is detected in the gas volume when the target gas measurement exceeds a target gas measurement threshold value and the parameter difference is less than a parameter difference threshold value.

Abstract: An integrated fire suppression system includes a plurality of fire detection systems. Each of the fire detection systems is individually addressable. A control system is communicatively coupled to each of the fire detection systems. A plurality of building systems is communicatively connected to the control system. The plurality of building systems includes at least one of a fire suppression system, an alarm system, a heating ventilation and cooling (HVAC) system, a building power supply system, and a building security system. The control system is configured to provide a localized response to a fire detection by at least one fire detection system in the plurality of fire detection systems, the localized response being a response in at least one of the plurality of building systems.

Abstract: A fire suppressant module according to one example includes a suppressant tank having a body and a base, a counterweight scale disposed in the base, and a data module comprising at least one of a display configured to display a weight of the suppressant tank and processor and a transmitter configured to communicate the weight of the suppressant tank.

Abstract: A refrigerant detection assembly operable to detect refrigerant mixed with air includes a housing having an internal cavity fluidly connected with an ambient atmosphere surrounding the housing via an opening. A subassembly mounted within the internal cavity includes an air chamber fluidly connected with the internal cavity, a non-dispersive infrared sensor operably coupled to the air chamber, a printed circuit board, and a heat conduction plate mechanically and thermally coupled to the printed circuit board. At least one insulator is arranged within the internal cavity at a position between a portion of the subassembly and the housing. A shell is connectable to the housing in overlapping arrangement with the opening. The shell has at least one shell opening formed therein such that a flow path extends from the shell opening, through the opening formed in the housing to the internal cavity, and into the air chamber.

Abstract: A protective shield for a sensor subassembly is disclosed. The protective shield includes a cover member and a plurality of mounting tabs. The plurality of mounting tabs extend from the cover member. Each of the plurality of mounting tabs is adapted to engage with a sensor housing of the sensor subassembly, such that the cover member is adapted to cover at least one sensor accommodated in the sensor subassembly. The provision of the cover member prevents at least one of heat, ambient particulate matter, particles or spray of liquid that may be present in the HVAC environment (such as water, oil, and refrigerant), vibration, electrical noise, and other emissions within the environment of the HVAC system from directly contacting the at least one sensor accommodated in the sensor housing.

Abstract: In a system for measuring a fire suppressant or fire suppression propellant quantity, the system comprising: a base (102); a top plate (106) positioned to support a tank (22) of said fire suppressant or fire suppression propellant; a plurality of springs (112) positioned between the top plate and the base to support the top plate atop the base, the plurality of springs positioned to support the top plate along a range of motion between an extended condition and a retracted condition; a first magnetic member (142) mounted to the base; a second magnetic member (140) mounted to the top plate so that a spacing between the first magnetic member and the second magnetic member decreases as the top plate moves from the extended condition to the retracted condition. At least one of the first magnetic member and the second magnetic member is a permanent magnet. A magnetic field sensor (160) is positioned to detect changes in a magnetic field associated with changes in said spacing.

Abstract: Embodiments of the disclosure describe a robust optical monitoring device and an operating method thereof. The optical monitoring device includes a housing comprising a first compartment and a second compartment. The first compartment includes a camera circuit board and a wireless connection circuit board, wherein the second compartment comprises a supply circuit board. Further, the housing includes an isolation cell to isolate the first compartment and the second compartment, a camera configured to be disposed in the first compartment of the housing to receive images associated with a sight glass, and an illumination board disposed within the first compartment of the housing positioned to project light for operation of the camera.

Abstract: A fire suppressant storage device (20) comprises: a tank (22) having a first port (40), a second port (70), and an interior (32) for storing fire suppressant. A discharge assembly (46) is mounted to the first port and comprises: a discharge valve (48); and a discharge conduit (50). The discharge conduit is at least partially within the interior and has an interior and an exterior. A liquid level measurement assembly is mounted to the second port and comprises: a tube (100) at least partially within the interior and having: an exterior and an interior sealed relative to the surrounding tank interior. A float (120) surrounds the tube and has one or more magnets (130) and having a range of motion. A plurality of magnetic field sensors (152, 154) are along a carrier (150) within the tube interior. The carrier extends from a proximal end to a distal end.

Abstract: An example SPR detection system includes a first prism having a first surface adjacent to a first metal layer exposed to a sample gas, and a second prism having a second surface adjacent to a second metal layer exposed to a reference gas. At least one light source is configured to provide respective beams to the first and second surfaces, where each of the beams causes SPR of a respective one of the metal layers. At least one photodetector is configured to measure a reflection property of reflections of the respective beams from the metal layers during the SPR. A controller is configured to determine whether a target gas is present in the sample gas based on a known composition of the reference gas and at least one of an electrical property of the first and second metal layers during the SPR and the reflection property of the metal layers.