FIELD: pipelines.SUBSTANCE: invention relates to a system and method of creating a velocity circuit. Probe system for extracting samples of divergent and explosive fluid from fluid sample source and return thereof to fluid sample source, characterized by that it comprises: elongated solid body of the sampling probe, made from stainless steel and having a port for extracting fluid samples, an output port of extracted fluid samples, a first channel for transmitting the recovered fluid, extending substantially axially in the direction of the length of the sampling probe housing to a first selected length, sufficient to pass between the fluid sampling port and the output port of the fluid samples, wherein sample probe defines separate return inlet of returned fluid samples, built-in into solid stainless steel housing, return outlet of returned fluid samples, and a second transfer channel for fluid return extending axially to the second selected length, substantially parallel to at least a portion of the first cha
