The digital air permeability tester according to Gurley consists of a robust cylinder with a pneumatic lifting and lowering mechanism. The start and stop position of the cylinder is detected by a sensor. The device is operated by a separate control unit, which evaluates the measurement data and displays it on a digital display, as well as calculating statistical values.
The sample is inserted into the test area and is pneumatically clamped when the start button is pressed. The calibrated cylinder is released and floats down into the sealing liquid. When the end position is reached, the measurements are sent to the control unit, and displayed there. When the stop button is pushed, the sample is released again and the measuring cylinder travels back to the start point. If more than one measurement is carried out, both individual and statistical values are displayed.