The invention provides an indoor air quality monitor (10) which has: a housing (12) providing an air intake (24) leading via a flow path, which is formed within the housing and which comprises a flow chamber (70), to an air outlet (28); a fan arranged to M propel air from the air intake (24) through the flow path to the air outlet (28); at least one sensor (56, 58, 60, 62) which is for sensing at least one air pollutant, the sensor (56, 58, 60, 62) being exposed to air in the flow chamber (70); and an air guide arrangement (46, 48, 64, 66, 74) which is downstream of the air intake (24) in the flow path and which forms a plurality of flow passages (76, 78, 80) through each of which air passes in operation of the indoor air quality monitor to reach the flow chamber (70).

A detector comprising an analytical apparatus for detecting a substance of interest, and a detector inlet. The detector inlet comprises a flow passage for carrying a flow of fluid, the flow passage comprising a sampling volume, and a sampling inlet adapted to collect samples of the fluid from the sampling volume as the fluid flows past the sampling inlet, and to provide the samples to the analytical apparatus, wherein the flow of fluid carries particulates. The detector inlet also comprises a flow director arranged to vary a spatial distribution of the particulates carried by the fluid to increase a relative proportion of the particulates carried past the sampling inlet along the flow passage without entering the sampling volume.

An off-gas detection system for mobile equipment includes an off-gas detection device, and a controller. The off-gas detection device is configured to removably couple with the mobile equipment. The off-gas detection device is configured to define a controlled flow path between an electrical energy storage device of the mobile equipment and an off-gas detector. The controller is configured to receive data from the off-gas detector regarding an air sample, determine a presence or concentration of off-gas within the air sample, and initiate one or more actions in response to determining the presence or concentration of off-gas in the air sample.

An air sampling system is disclosed. The air sampling system includes: an air intake unit defining an inlet and an air inflow channel; a fan configured to cause air in a sampling environment to flow into the air inflow channel via the inlet; a cooling unit for cooling air in the air inflow channel; a collection chamber for collecting liquid water condensed from air in the air inflow channel, the collection chamber being removably coupled to the air intake unit and including an active target substrate having a surface that is coated with bioreceptors; and an optical detection unit including a light source, the optical detection unit being configured to illuminate the active target substrate with the light source.

A filter-based air sampler, more specifically a filter-based air sampler capable of integration into small unmanned aerial systems is disclosed. The filter-based air sampler may include a filter assembly which has as its component parts: an open faced air intake component, a filter, and a filter support that has a central supporting grid. The filter assembly may joined to the housing of a fan, such as a centrifugal fan, with the supporting grid of the filter support being disposed over the air inlet of the fan.

An air quality measurement unit comprising: a housing having an inlet for receiving an air flow and an outlet for venting said air flow; a plurality of sensors positioned in said housing forming an array of sensors, each sensor having a sensor inlet for receiving a portion of the air flow and a sensor outlet for venting said portion of air flow; each sensor arranged to measure an air quality parameter; wherein said sensors are placed such that the sensor inlet is positioned adjacent to the inlet.

A system for real-time detection of airborne pathogens is disclosed. The system includes: an air intake unit defining an inlet and an air inflow channel; a fan configured to cause air in a sampling environment to flow into the air inflow channel via the inlet; a cooling unit for cooling air in the air inflow channel; a collection chamber for collecting liquid water condensed from air in the air inflow channel, the collection chamber including: an active target substrate having a surface that is coated with bioreceptors; and a reference target substrate that is not coated with bioreceptors, and an optical detection unit that is configured to independently illuminate the active target substrate and the reference target substrate with light for detecting presence of an airborne pathogen.

A wear debris collection device includes a rotation body that is connected to a rotation shaft and performs rotating movement in accordance with rotation of the rotation shaft, a braking member that brakes the rotating movement of the rotation body, a hood covering the rotation body and the braking member and to prevent dust from entering from outside, a blower that blows air into the hood, a collection apparatus that suctions air in the hood and collects wear debris of the braking member contained in the air, and an air pressure adjuster that measures air pressure in the hood and external air pressure and adjusts an air quantity of at least one of the blower and the collection apparatus so that the air pressure in the hood equals the external air pressure.

A smoke detection device main body of a portable smoke detector can switch smoke detection sensitivity. At the start of operation, the smoke detection sensitivity of the portable smoke detector is equal to or higher than a smoke detection sensitivity of a fixed smoke detector that detects smoke in a monitoring area. At this time, switching of smoke detection sensitivity does not work. After the fixed smoke detector detects smoke generation, when the portable smoke detector is used to locate the smoke generation position while moving in the monitoring area, an operation is performed from an initial sensitivity. When a predetermined smoke detection signal is detected while using the portable smoke detector to identify the smoke generation position, the smoke detection sensitivity switching is activated, and the smoke detection sensitivity is changed accordingly. By lowering the smoke detection sensitivity, the smoke generation position is narrowed down and identified.

The invention provides an apparatus for increasing a number concentration of molecules of an analyte of interest in real time from a sample gas flow containing ionised molecules of the analyte, aerosol particles and other molecules, the apparatus comprising: an ion-concentrating chamber having: an inlet for receiving the sample gas flow; an ion outlet; and at least one other outlet; the ion-concentrating chamber being connected or connectable to a gas flow generating and controlling device for establishing a gas flow velocity field within the ion-concentrating chamber to direct the aerosol particles and other molecules of the sample gas flow to the at least one other outlet; and one or more electrodes arranged in an axially spaced apart manner along the ion-concentrating chamber for creating an electric field within the ion-concentrating chamber to direct the ionised analyte molecules in the sample gas flow to the ion outlet, wherein the electrodes are configured such that an absolute value of the strength of the electric field increases progressively along the ion-concentrating chamber.