The Series 6400 Gas Detector warns users of hazardous chemicals detected in the atmosphere. When incorporated with an emergency shutdown system, the Series 6400 Gas Detector can turn off the supply of hazardous gas immediately after a leak is detected. The Series 6400 Gas Detector is a simple to use, all-in-on gas detector. This gas detector comes pre-calibrated and ready to plug in, with sensors and receiver / alarm modules. An auto-test option is also available.