biofilm collection device, system and method for measuring biofilm for a network of industrial type pipes

The invention relates to a biofilm collection device to a network of industrial type pipes, the collecting device comprising a bypass (1) to put in place on a pipe (2) in which a fluid is capable of moving and cause the growth of a biofilm, characterized in that the bypass comprises: - at least one growth medium (10) of biofilm; - means for measuring the speed Vd (11) for moving the fluid in the bypass; - means for controlling and / or adjusting speed (12) of the fluid in the bypass to the hydraulic flow regime of the fluid in the bypass or turbulent type.