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
Husqvarna Group range expanded to heating boilers and lawn mowers. The first test with a lawn mower powered by an engine was done in 1947. 1959 – Chainsaws As demand for bicycles, mopeds and motorcycles declined, forestry became increasingly important. The expertise in engines was utilized in new areas and the first chainsaw was produced in 1959. 1968 – Power cutters A saw rebuilt to a power cutter in 1968 was the starting point of what today is the business area Husqvarna Construction. 1978 – Electrolux acquired Husqvarna. 1986 – The motorcycle division was sold to Cagiva. 1995 – Robotic lawn mowers