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
Sensation Lawn Mowers as greaseable wheels, thick cast aluminum decks, and some unique innovations like a cone-shaped metal crankshaft support which was purported to help prevent bending of the crankshaft. Sensation Lawn Mowers Sensation Lawn Mowers was a commercial lawnmower brand created by Howard Phelps in 1944. The Sensation Lawn Mower Company was located in Ralston, Nebraska, USA. Howard Phelps received patent number 2,265,545 on his mowing machine, which featured a rotary cutting blade directly driven by an industrial quality electric motor in 1941. This very prototype still exists and is on display at the Pioneer Village Museum in Minden, NE. The Sensation