The U.S. has tightened limit values for methane and hexane. Previous rules allowed a percentage proportion of readings to exceed limits which meant the LEL was 4,400 ppm. New, much tougher standards require these components to be no more than 1,000 ppm.

As regulatory agencies around the world tighten exposure limits and rules, the ability to measure gases at these lower levels has increased.

Gas detectors are essential in environments where toxic or explosive gases are used or stored, or in areas where oxygen levels are low, e.g. badly ventilated rooms, shafts, tanks and sewers. In particular, the fermentation or rotting processes in sewage treatment and the production of biogas can give rise to noxious gases, often in unfamiliar mixtures. At IFAT 2008, which takes place from May 5 to 9, 2008 in Munich, visitors have the opportunity of finding out all about the latest trends in the sector and the technological solutions to handle the problems. For more information, visit www.ifat.de/link/en/16607391.