Gas detector in industrial refrigeration processes and biological degradation processes, including exhaled breath. Depending on the required sensitivity, different types of sensors are used (e.g., flame ionization detector, semiconductor, electrochemical, photonic membranes). Detectors usually operate near the lower exposure limit of 25ppm; however, ammonia detection for industrial safety requires continuous monitoring above the fatal exposure limit of 0.1%. There are several different sensors that can be installed to detect hazardous gases in a residence. Carbon monoxide is a very dangerous, but odorless, colorless gas, making it difficult for humans to detect. Carbon monoxide detectors can be purchased for around US$20–60. Many local
John Deere Gator John Deere Gator Gators are used mainly on farms and sometimes in the military, but most people refer to them as farmers' vehicles. They can be ordered with specific off-road features. In 1992, the vehicle replaced the three- or five-wheel John Deere AMTs, introduced in 1987. The Gator vehicles use small but powerful 341 cc (0.341 L) four-stroke engines found in lawn mowers, or an optional diesel engine that is also found in some Deere mowers and utility tractors. They use a continuously variable transmission employing a belt and a conical pulley system. Thus, they require no clutch or gear