Abstract: A hydrostatic head tester arrangement has a frame, a test pressure generating device, a clamping device having first clamping ring and a second clamping ring and wherein a power gain element is connected to the first clamping ring. Further, the power gain element is connected to an actuation lever via a resilient member.

Abstract: The invention relates to a method for detecting drops of a liquid on a surface of a test specimen (16) originating from a liquid applied under pressure to an opposite surface of the test specimen during at least one test cycle comprising at least the steps of: a) monitoring the surface of the test specimen (16) with the aid of a digital camera (12); b) recording data, wherein the data are at least one image or at least one image and additional data information, at incidence of an event during a test process wherein the event is at least one of: start of the test cycle, incidence of at least one drop on the surface of the test specimen, end of the test cycle, manually initiated image recording, alarm situation.

Abstract: A hydrostatic head tester arrangement has a frame, a test pressure generating device, a clamping device having first clamping ring and a second clamping ring and wherein a power gain element is connected to the first clamping ring. Further, the power gain element is connected to an actuation lever via a resilient member.

Abstract: An air permeability apparatus has a test head with an opening, a vacuum pump, a clamping arm and an orifice disk that is rotatable around its central axis. The orifice disk is arranged between tubes and the vacuum pump and has a plurality of orifices. The orifice disk has at least one slit, the slit extending from an area of the perimeter of the orifice disk towards a central opening of the orifice disk. The length of the slit overlaps a contact area between a first ending of one of the tubes and the surface of the orifice when the slit is in a cleaning position and/or an air jet nozzle is aimed towards the orifice disk.

Abstract: An air permeability apparatus has a test head with an opening, a vacuum pump, a clamping arm and an orifice disk arranged between the test head and the vacuum pump, wherein the orifice disk has a plurality of orifices. The orifice disk is arranged vertically or inclined with respect to the opening.

Abstract: For continuous measurement of the air permeability of a moving or stationary cloth web, the latter is guided over a measuring orifice which opens at the end of a measuring tube through a convexly curved outer surface of a measuring head. This convexly curved surface deflects the web. As a result of the tensile stress in the web, the web thereby automatically sealingly clings to this surface around the measuring orifice. In the measuring tube, air is sucked by a pump through the web part extending across the measuring orifice. The flow speed of the air sucked through a test sample is measured in a flowmeter, is indicated as the air permeability of the test sample by an indicator instrument, and if appropriate is used for regulation.