SITRANS FS230 Ultrasonic Flow Meters FST030 Transmitter Stainless/Carbon Steel, Temperature -40 to +66C (-40 to 150F) Outside diameter between 510-813mm(20.1-32.0") Wall thickness between 8.128-11.176mm(0.32-0.44") High precision mounting - single enclosure (short, two sensors in one enclosure) One way (one pair of sensors) Standard environment Wall box, internal DSL, remote transm to sensor