12 has been determined likewise in certain embodiments sensor 60 is disposed along flow shaping line 17 or line 43 at a point where substantial liquid stratification has taken place thereby increasing the accuracy of sensor 60 in certain embodiments sensor 34 and sensor 60 may be a single sensor utilized for multiple functions such as to identify the cut of gas a first liquid and a second liquid in flow 12 turning to fig4 other embodiments of the invention are illustrated in certain embodiments the curvilinear flow path 16 is substantially in the form of a plurality of loops l 1 l i each loop characterized by a diameter d 1 d i that together comprise flow shaping line 17 the loops l are disposed along an axis 62 in certain embodiments the diameter d of the loops l may remain substantially constant along the length of axis 62 while in other embodiments the diameter of the loops may increase or decrease either randomly or successively in the illustrated embodiment the diameter d of successive loops decrease along the length of the flow shaping line 17 from the first end 64 to the second end 66 of flow shaping line 17 the plurality of loops l may be provided to develop the increased concentration of the gas 22 on the inner wall 24.