For a better understanding the meaing of the sensor-version nomenclature will be explained in the following. Pitot tube sensors which start with the letter „IB..“ are designed for fixed (installation not under pressure) installations. The letter „R“ („F“, „G“) indicates a threaded (flanged, welded) process

connection between the pipe and the sensor’s assembly components. All sensors, which are used to measure steam have the letter „D“ at the end of the model name. The additions „HT“ or „HTG“ stand for „High Temperature“. Pitot tube sensor series „Flo-Tap“ is indicated by the letter „FT’ at the

beginning of the model name. They can be installed and removed under pressure conditions (wet-tap design). The letters „N“ („M“, and „H“) signify their possible use in low („N“) and medium and high operating pressure applications, with „D“ for steam use. Model series 21,26,36 and 66 differ from

series 20,25,35 and 65 in that they come with a counter-end support, which serves to avoid mechanical stress caused by high flow velocities and high impact pressures or sensor-resonance oscillations