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  2. Gas detector - Wikipedia

    en.wikipedia.org/wiki/Gas_detector

    A gas detector is a device that detects the presence of gases in an area, often as part of a safety system. A gas detector can sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave.

  3. Smoke detector - Wikipedia

    en.wikipedia.org/wiki/Smoke_detector

    Smoke detector mounted on a ceiling. A smoke detector is a device that senses smoke, typically as an indicator of fire.Smoke detectors/alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary.

  4. General Atomics MQ-20 Avenger - Wikipedia

    en.wikipedia.org/wiki/General_Atomics_MQ-20_Avenger

    In December 2011, it was reported that the Air Force had ordered an Avenger and that it would be deployed to Afghanistan. "This aircraft will be used as a test asset and will provide a significantly increased weapons and sensors payload capacity on an aircraft that will be able to fly to targets much more rapidly than the MQ-9 [Reaper] UAS," the USAF said in an announcement.

  5. Aspirating smoke detector - Wikipedia

    en.wikipedia.org/wiki/Aspirating_smoke_detector

    An aspirating smoke detector (ASD) is a system used in active fire protection, consisting of a central detection unit which draws air through a network of pipes to detect smoke. [1] The sampling chamber is based on a nephelometer that detects the presence of smoke particles suspended in air by detecting the light scattered by them in the chamber.

  6. General Atomics MQ-9 Reaper - Wikipedia

    en.wikipedia.org/wiki/General_Atomics_MQ-9_Reaper

    The satellite antenna and sensors of an NOAA-NASA flight demonstrator, 2005 MQ-9 Reaper crews (pilots and sensor operators), stationed at bases such as Creech Air Force Base , near Las Vegas , Nevada, can hunt for targets and observe terrain using multiple sensors, including a thermographic camera .

  7. General Atomics MQ-1 Predator - Wikipedia

    en.wikipedia.org/wiki/General_Atomics_MQ-1_Predator

    The UAS consists of four aircraft or "air vehicles" with sensors, a ground control station (GCS), and a primary satellite link communication suite. [3] Powered by a Rotax engine and driven by a propeller, the air vehicle can fly up to 400 nmi (460 mi ; 740 km ) to a target, loiter overhead for 14 hours, then return to its base.

  8. Fire detection - Wikipedia

    en.wikipedia.org/wiki/Fire_detection

    In dwellings, smoke detectors are often stand-alone devices. In non-domestic buildings, fire detection will typically take the form of a fire alarm system, incorporating one or more of the following automatic devices: Heat detector; Smoke detector; Flame detector; Fire gas detector

  9. Optical beam smoke detector - Wikipedia

    en.wikipedia.org/wiki/Optical_beam_smoke_detector

    An optical beam smoke detector is a device that uses a projected beam of light to detect smoke across large areas, [1] typically as an indicator of fire. [2] They are used to detect fires in buildings where standard point smoke detectors would either be uneconomical [ 3 ] or restricted for use by the height of the building.

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