/emerson-exchange/b/weblog/posts/incus-hears-tiny-gas-leaks-in-big-areasby Jim Montague Intrinsically Safe Device Listens for the Ultrasonic Hiss of Escaping Gas Sometimes sound is better than sight—just ask any bug-hunting bat, submarine sonar operator or air-traffic controller. They all know that seeing requires a narrowlyen-USTelligent Community 13