General Monitors’ S4000CH Combustible Gas Detector provides continuous monitoring of combustible gases via its catalytic bead technology. The unit features one person calibration and can virtually self-calibrate by simply activating a magnetic switch and applying gas. It is designed to monitor natural gas and vapors within the lower explosive limit (LEL) and provide status indication and alarm outputs. It complies with ANSI/ISA 12.13.01-2000 performance requirements for combustible gas detectors. The IR400 Point IR Gas Detector uses infrared technology to sense for combustible gases and vapors to quickly and reliably detect LNG gas leaks. The detector comes factory pre-calibrated, has a three-second response time, takes only minutes to set-up, operates with less than 4.8 W of power, and is inexpensive to operate and maintain.