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

Claim 10:
11. An apparatus for detecting leakages from sealed containers, said apparatus comprising:
a detection zone (13) adapted to receive a sealed container (CT);
a pair of gas sensors (219a, 219b) including a first sensor (219a) and a second sensor (219b);
a duct (21) communicating with said detection zone (13) and said pair of gas sensors (219a, 219b);
a flushing gas blower (23) provided with an outlet port (23a) for said flushing gases, said outlet port (23a) communicating with said duct (21) said blower (23) being configured for introducing a flushing gas into said detection zone (13) by making said flushing gas flow through said duct (21) in a first direction;
a suction fan (25) provided with an inlet port (25a) from which air is sucked, said inlet port (25a) communicating with said duct (21), said suction fan (25) being configured for sucking gas from said detection zone (13) by making said gas flow through said duct (21) in a second direction opposite to said first direction;
wherein the pair of gas sensors (219a, 219b) are 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) communicating with the detection zone (13); and
wherein a corresponding signal (M1, M2) coming from said pair of gas sensors (219a, 219b) is sent to a comparator (210), whereby a signal (M3) outputted by said comparator (210) is 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.