Bent-tube sensor for gas measurement

The utility model relates to a pipeline flow measurement sensor, in particular to a syphon sensor for gas measurement, which comprises a syphon, a pressure sampler fixed in an arc roof of the outer bend inside the siphon. The axis of the pressure sampler is in an acute angle with a line connecting the arc roofs inside the siphon and the lumen of the pressure sampler expands from inside to outside through a cone. Due to the appropriate increase of the aperture of the pressure sampler which causes a transition from large to small through the cone, the measuring precision is guaranteed by preventing bubbles from gathering in the sharp corner of the pressure sampler, and the siphon flowmeter is stable in performance and reliable in operation by preventing the condensation water entering inside a guiding press pipe.