Pfannenberg offers its rugged PATROL® Series Flashing Sounders for fixed gas detection alarming. Designed to alert personnel of an evacuation when there is presence of hazardous gas, these combined signaling products increase safety when used with gas monitoring systems in wastewater treatment and other industrial applications. The PATROL® Series Flashing Sounders offer 80 pre-programmed alarm tones with 4 stages for distinctive signaling of specific events. The devices are particularly well suited for environments with high ambient noise levels or when the use of hearing protection may hamper a sounder’s effectiveness, or in bright environments where visual signals alone do not suffice. A single device in heavy duty industry (90+dB) can cover over 350,000 ft³ visually and 800,000 ft³ audibly.