Device for fluid measuring

Duct, for the passage of a fluid to be detected and/or measured, said duct configured to be used for/in an ultrasound device for measuring the fluid, the duct comprising:

• a first piece and a second piece, which are entirely or mostly made of polymeric material by molding, and which, once molded, are configured to be joined and fixed together to define, following their union, a measurement channel, which is configured to be crossed by the fluid to be measured,
• a first port for the inlet or outlet of the fluid to be measured in/from said duct,
• a second port for the outlet or entry of the fluid from/into said duct, wherein:
• the first piece comprises a tubular portion with an open/missing area,
• said second piece is configured so as to close the first piece in correspondence with the open/missing area so that the two pieces thus united and fixed, define said measurement channel which is closed in a fluid-tight manner in correspondence with the areas of union between the two pieces, said second piece comprising in correspondence with its surface facing the inside of the measurement channel an internal area which is intended to be lapped by the fluid passing through the duct and in which an ultrasonic signal emitted by at least one sensor is reflected, or by a pair of sensors, configured to be operatively associated with said duct so as to emit said ultrasonic signal inside the measurement channel.