Take a look at the Fluid Components International (FCI) Air/Gas Flow Measurement Solutions Handbook.

FLT93 Series FlexSwitch

FLT93s are found in continuous operation in the most demanding and critical process and plant applications. You will find FLT93 the most preferred solution in oil and gas upstream, and downstream applications; wastewater treatment; chemical operations; power plants, including nuclear power;
food and beverage; refineries; mining; metals; manufacturing; and more.