Dosing method and filling machine

A method for dosing a product in liquid form in containers, comprising:

• transferring doses of product from a feed tank to said containers by means of a dosing unit each dose of product comprising a pre-established quantity of product;
• during said transferring, checking by means of a bubble sensor said doses of product that flowing from said feed tank through said dosing unit up to said containers for detecting the presence of gas bubbles and measuring a volume of said gas bubbles in each dose of product;
• performing one of the two following steps:
• delivering said doses of product in said containers in case said bubble sensor detects a volume of gas bubbles transferred from said dosing unit lower than a predefined reference value, or
• deviating and conveying towards said feed tank said doses of product transferred from the dosing unit in case said bubble sensor detects a volume of gas bubbles in said doses of product equal to, or higher than said predefined reference value.

A filling machine for dosing a product in liquid form in containers comprising a dosing system that includes:

• a dosing unit for delivering a dose of product, wherein each dose comprises a pre-established quantity of product;
• a feed tank for feeding with said doses of product said dosing unit by means of a first duct;
• at least one delivery element connected to said dosing unit by means of a second duct to release said doses of product in said containers,
• a bubble sensor associated to any one between said first duct and said second duct and arranged to detect the presence of gas bubbles in said doses of product which flow in said ducts, wherein the bubble sensor measure a volume of said gas bubbles in each dose of product;
• said filling machine further comprising:
• a weighing station provided with a weight sensor to measure a weight of said containers filled with said dosing system and to detect out-of-spec containers, wherein said out-of-spec containers have a weight out of a range of accepted weights;
• a processing and control unit set up for receiving and processing a weight signal from said weight sensor and a bubbles signal from said bubble sensor, wherein said processing and control unit is connected to said dosing unit and set up so as to modify said pre-established quantity of product supplied for each product dose as a function of the weight signal received by the weight sensor, and said processing and control unit is further set up to inhibit said modifying said pre-established quantity of product supplied for each product dose as a function of the weight signal received by the weight sensor, in case said bubble sensor detects in said products doses a volume of gas bubbles lower than a pre-established reference value.