The Type 3738 smart inductive limit switches for pneumatic control valves are designed to work in all general industrial applications. The limit switch will work on linear control valve via IEC NAMUR and direct (Type 3277 actuator) attachment methods as well as on rotary valve according to VDI/VDE 3845. The 3738 limit switches are offer in two version 3738-20 with diagnostics and a 3738-50 with Foundation Fieldbus and diagnostics. Diagnostic functions of the 3738 include partial stroke test (PST), movement counter, operating hours counter, dead time and transit time measurement.