Proline Series Prosonic Flow 93P operates on principle of transit time difference where ultrasonic signal is transmitted bidirectionally from one sensor to another. System accommodates most pipes with 2-160 in. dia. Stainless steel sensor clamps onto pipe and operates from -40 to +340°F. Transmitter wall-mounts in nonhazardous or Class I, Div 2 areas. It's configured for 2-channel measurement at one or 2 different points. Materials include acid, paint, liquefied gas, and ultrapure water.