Explosive gas leak detectorAn explosive gas leak detector is a device used to detect explosive gas leaks in enclosed spaces. Typically, a local alarm will be triggered, and optionally a remote alarm may also be connected.ApplicationCarbon [monoxide detector]s will not detect explosive mixtures; thus the device is often recommended to complement the CO detector. Combination explosive gas leak and carbon monoxide detectors exist.PlacementA detector for propane is best placed down low near the floor, as propane is heavier than air. A detector for natural gas is best placed up high, near the ceiling. Some detectors can detect both natural gas or propane, but this requires a compromise location.