I am trying to get something out of coolprop.dll on the lines of =PropsSI("H","P",(gauge pressure+101.325)*1000,"S",entropy,"R134a"). But the attached vi just crashes Labview. I tried with " , ' and just plain text for the variables, same result. The Labview wrappers here do not work for me either. Whats wrong with that vi, .dll connection looks straight forward. Could I use a formula node to invoke C?