Rotork Schischek ExMax explosionproof actuators have been selected to assist the production of biogas for district heating systems in the German city of Munich. Biogas is produced during the effluent treatment process at the city’s largest wastewater plant Klaerwerk Gut Grosslappen.

The ExMax actuators have been installed in the digester and fermentation tanks, where all electrical equipment must be approved for use in hazardous areas. Built inside four large towers, the fermentation tanks mix the waste at a defined temperature to produce the biogas. For optimum performance, the inner tank temperature must be maintained at 100°F (38°C).

Six ExMax actuators are installed in an area known as the lamp at the top of each tower for the operation of air dampers to balance the inside temperature with fluctuating ambient temperatures on the outside.