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A typical calibration schedule for a portable gas detector is a daily "bump test" accompanied by a monthly calibration. [17] Almost every portable gas detector requires a specific calibration gas In the US, the Occupational Safety and Health Administration (OSHA) may set minimum standards for periodic recalibration. [citation needed]
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The General Atomics MQ-9 Reaper (sometimes called Predator B) is an unmanned aerial vehicle (UAV, one component of an unmanned aircraft system (UAS)) capable of remotely controlled or autonomous flight operations, developed by General Atomics Aeronautical Systems (GA-ASI) primarily for the United States Air Force (USAF).
The device, also called a combustible gas detector, operates on the principle of resistance proportional to heat—a wire is heated, and a sample of the gas is introduced to the hot wire. Combustible gases burn in the presence of the hot wire, thus increasing the resistance and disturbing a Wheatstone bridge, which gives the reading.
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.
Sensors failed at 134 hours, compared to 250 hours required. In October 2011, a report concluded the Gray Eagle was meeting only four out of seven "key performance parameters," and its reliability fell short of predicted growth. 11 unplanned software revisions had generally improved reliability. [6]
MQ-25 T1 Stingray test aircraft refuels F-35C, 2021. In late April 2019, the first MQ-25 test aircraft (T-1 or "Tail 1") was taken by road from Boeing's technical plant at St. Louis's Lambert International Airport across the Mississippi River to MidAmerica St. Louis Airport, which is conjoined to Scott Air Force Base. [18]
A nondispersive infrared sensor (or NDIR sensor) is a simple spectroscopic sensor often used as a gas detector.It is non-dispersive in the fact that no dispersive element (e.g a prism or diffraction grating as is often present in other spectrometers) is used to separate out (like a monochromator) the broadband light into a narrow spectrum suitable for gas sensing.
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