Set maximum states for saturation curves for pseudo-pures properly

[paarfi]

AbstractState state = AbstractState.factory("HEOS", "R507A);
state.update(input_pairs.QT_INPUTS, 1.0, 355.37222222222226);
Exception -> "p is not a valid number"

[ibell]

You are in the very-near critical region, and R507A is pseudo-pure, probably this is an impossible state to meet, the error message should be clearer though...

[paarfi]

Yeah, I was only doing this calc as part of a T,P calc to compare pressures and see if I was sitting on the saturated vapor line. I'd be better to do this by checking P,Q and comparing temperatures. I agree a more informative error message would help. Thanks.