Patent ID: 11921009
Assignee: FT SYSTEM S.R.L.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for detecting leakages from sealed containers, said method comprising the steps of:
defining a detection zone (13) in which a sealed container (CT) will be placed;
putting said detection zone (13) in communication with a pair of gas sensors (219a, 219b) through a duct (21a, 21b) the pair of gas sensors (219a, 219b) including a first gas sensor (219a) and a second gas sensor (219b) and being connected in series to each other by a segment (21a) of said duct (21), the inner volume of which is known and which determines a corresponding delay line in gas propagation along the duct (21);
introducing a flushing gas into said detection zone (13) by making said flushing gas flow through said duct (21) in a first direction;
placing a container (CT) in said detection zone (13);
sucking gas from said detection zone (13) and transferring it to the pair of gas sensors (219a, 219b) for ascertaining a presence of a gas leakage in said container (CT), said gas being transferred from said detection zone (13) to said pair of gas sensors (219a, 219b) by making it flow through said duct (21) in a second direction opposite to said first direction
obtaining a corresponding signal (M1, M2) from said pair of gas sensors (219a, 219b) and sending each corresponding signal (M1, M2) to a comparator (210); and
obtaining an output signal (M3) from the comparator (210), the output signal (M3) being indicative of a presence of a leakage from a container present in the detection zone (13) when the signal (M2) of the second sensor (219b) exceeds a floating threshold determined by the variable signal (M1) of the first sensor (219a) at the same time instant.