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1、 Pore Size Meter PSM 165 The unique Pore Size Meter PSM 165 provides pore size information for a wide range of porous materials with applications in the field of filtration, hygiene and Tissue engineering. Materials that may be tested include filter papers, micro sieves, non-wovens as well as woven
2、materials and sintered polymers or metals. The operator is guided through the test procedure by an easy to use software package PSMWin running on a standard PC. The following parameters describing the inner structure of the material can be obtained with this compact measuring instrument: Bubble Poin
3、t Pressure drop at which the wetted sample starts to become gas permeable. Pore Size Distribution Permeability weighted pore size distribution calculated from wet flow curve (pressure drop vs. volumetric flow rate of the wet sample) and dry flow curve (similar to wet flow, but obtained on a dry samp
4、le). Mean Flow Pore Size Pore size diameter corresponding to the pressure drop where the wet flow value is half (50%) of the dry flow. Applications Filter material development Quality assurance Specification of filter materials Advantages Quick and easy sample change Flow rate range adjusts to test
5、item Computer controlled test procedure and user friendly data acquisition and presentation in Windows environment User defined test fluid Measured pressure drop vs. flowrate for a dry and wetted sample of non-woven material The pressure drop across the filter media sample is measured as a function
6、of the gas flow rate through the sample for the dry and the wetted sample material. As a test fluid Topor (perfluoro compound, Topas specific testing fluid) is recommended due to its excellent wetting behavior. Data acquisition and processing is completely computerized guiding the operator with spec
7、ific instructions. Pore Size Meter for Filter Papers, Woven Materials, Non-Wovens and other Porous Materials PSM 165 Differential Pressure at sample Dry-Flow Wet-Flow Bubble PointWet-Flow 2Dry-Flow 2Dry-Flow 1Wet-Flow 1FlowRate Principle of Operation The basic principle of pore size measurements is
8、that liquid filled pores will become gas permeable at a certain gas flow pressure. This initial pressure indicates the bubble point of a material. As real materials contain a range of pore sizes, the bubble point corresponds to the opening pressure of the largest pore. The measured pressure value is
9、 dependent on the surface tension of the test fluid used. By further increasing the gas flow rate, and therefore the pressure drop across the material under test, it is possible to calculate a pore size distribution from these two measured parameters. The applied measuring principle is in close acco
10、rdance with ASTM E 1294-89 and ASTM F 316-03 standards. In addition to Topor, measurements can be carried out with a range of other test fluids. To achieve reliable results the surface tension of the test fluid must be known and a sufficient wetting of the test sample has to be guaranteed. Dialog wi
11、ndow for choosing a test fluid Flow Scheme of PSM 165 The basic configuration of the device is shown in the following figure. Two high-precision mass flow controllers are used to generate a defined flowrate which is passed through the test sample. The resulting differential pressure is measured by p
12、ressure sensors which can be customized to provide the best possible result for a specific sample type. Basic setup of the PSM 165 Test Procedure Connect the instrument to compressed air supply and PC (RS 232 interface) Prepare the sample and insert into the holder Run PSMWin software which guides t
13、he operator through all necessary steps of a complete sample test Create new test file in software and select desired test conditions Start measurement Test duration depends on sample (approx. 15 min) Display measuring data as graphics or table and store/print/transfer data Colour-coded adapters for
14、 clamping the sample Principle of Operation Mass Flow ControllerBubble Flow ValveDrain valvSample Holder Main Mass Flow Controller PressureSensor23 mm 16 mm 11 mm 6 mm The specially developed data acquisition and control software PSMWin runs on all Windows-platforms, is easy to use, and features som
15、e of the following functions: Guiding the operator through the whole test procedure Automated test procedure Data presentation with protocol printout Dynamic data exchange with Excel and via “copy and paste” for other applications Pore size calculator Pore size calculator for evaluation of the measu
16、ring range Test file structure As the test procedure is fully automated, the operator must only perform the sample preparation. The measurement itself is done automatically recording pressure drop and flow rate data during the test. Necessary adjustments of test parameters to different sample properties can be done easily via the software. The measuring range of the PSM 165 depends on the specified pressure transducers and the te
