The VOC-3 detector is designed for enclosed spaces or mechanical rooms where refrigerant leaks from chillers could pose a danger to personnel. This detector can cover up to 10,000 sq. ft. of clear, open space. It is designed to operate two-speed fans using two dry contacts that close at the appropriate low and high concentration levels for the refrigerant gas being detected. Refrigerants detected include R-11, R-12, R-22, R-62, R-113, R-502 and R-134a. It also includes visual indicators on the front of the unit for low and high level with an audible alarm at the high level. The VOC-3 is constructed of heavy, damage-resistant PVC with vandal-proof screws. Units are available with integral (standard) or remote (optional) sensor heads. Typical installations include mechanical rooms and personnel lounges in industrial buildings.