| 主权项 |
1. A leak detecting arrangement for packages, which packages contain a test gas, which leak detecting arrangement is located adjacent a transport arranged to transport the packages, the arrangement comprising:
a testing station in which a package is located by the transport, wherein the packages are arranged to have an internal pressure above the ambient pressure when located in the testing station, a gas sensor located in gas communication with the ambient air surrounding a portion of the package to be tested, wherein the sensor is arranged to detect the concentration of test gas in said ambient air and transmit a signal representing said concentration, an electronic control unit arranged to receive the signal from the gas sensor, wherein the electronic control unit is arranged to determine an instantaneous slope value for the concentration of test gas in the ambient, to monitor instantaneous slope values over time and to generate a fault signal if an instantaneous slope value exceeds the preceding monitored instantaneous slope value, a continuously operated suction arranged to draw ambient air past a seal on the packet to be tested, wherein the continuously operated suction is provided with a flow guide conforming to the shape of the seal, and a pair of opposing fluid actuators and opposing clamping means, wherein the clamping means are arranged to apply a predetermined pressure on the upper portion of the package below the seal to be tested in order to form a partially enclosed space with the fluid actuators such as to contribute to the forming of a flow guide around the seal and guide ambient air past the seal. |
