The Model 5100-04-IT Carbon Monoxide Gas Sensor Module from Sierra Monitors (USA) utilizes smart sensor technology to provide the user with more than just another oxygen gas sensor. This network-enabled gas detector includes: Extended calibration frequencies only requiring calibration every 6 months, cutting normal calibration requirements in half; Non-intrusive, one-person calibration for easy calibration; SIL-2 Certified for long term reliability; User-friendly, 8-character, fixed and scrolling LED display for ease of set-up with understandable menus; Choice or combination of outputs; Remote sensor configuration option to meet unique applications requirements; and Cast aluminum or 318 Stainless Steel enclosures for Class I, Div. 1, Groups B, C, D area.