Control Instruments Corporation Gas Sensors details:
The catalytic and electrochemical sensors are widely used as area monitors for detection of combustible and toxic substances. When used with the SmartMaxII stand-alone controller, they can report directly to many existing control systems. Additionally they are able to do this without the need for a dedicated monitor instrument. The controller is an explosion proof field transceiver that can accept up to four combustible, toxic or oxygen sensors. This greatly reduces both purchase price and installation costs. Its designed for indoor and outdoor area monitoring installations & reports the readings from up to four sensors including catalytic sensors for LFL monitoring and electrochemical sensors for oxygen and toxic gas monitoring.
