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
Lawn-Boy new 2-stroke engine in 1970 that produced more power, with less weight and fewer parts. During this time the D-400 engine became popular. In 1988, Lawn-Boy acquired Gilson Brothers Co., a Wisconsin-based manufacturer of outdoor power equipment and recreational equipment. In 1989, OMC sold Lawn-Boy to the Toro Company, and eventually consolidated to the Toro headquarters in Bloomington, Minnesota. Since the acquisition by Toro, Lawn-Boy has introduced several new series of lawn mowers, including a new lineup of walk-behind mowers and an entirely new category of Zero Radius Turning mowers. Lawn-Boy In 1934, the original Lawn-Boy lawn mower was manufactured