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| Density Stereopycnometer Manual, Surface Area and Pore Size Analyzer, Automatic Pore Size Analyzers, Ultrafoam Pycnometer, Salt Spray Tester, Climatic / Stability Chamber | |||||||||
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The Stereopycnometer is a manually operated instrument designed to measure the true volume of powders and other solid materials by employing Archimedes’ principle of fluid ( gas) displacement and the technique of gas expansion. From this volume, density is easily determined by dividing into the weight of the sample. It features a digital display and fine adjustment controls for both pressurization and venting rates. A complete density analysis can be done in as little as a minute.
Gas is used as the displacing fluid since it penetrates the finest pores assuring maximum accuracy. For this reason helium is recommended, since its small atomic dimension enables entry into crevices and pores approaching two Angstrom ( 10-10m) . Its behavior as an ideal gas is also desirable. Other gases such as nitrogen can be used, often with no measurable difference. The Stereopycnometer comes with a choice of two inter-changeable sample cells used in conjunction with a single reference volume. A sample is placed in the sample cell and degassed by purging with a flow of dry gas, by vacuum, or by a series of pressurization cycles. The standard analysis is performed by pressurizing the sample cell to approximately 17 psi and recording the value. The selector valve is rotated so the gas expands into the reference or added volume and that lower pressure is recorded. From these two readings, the sample volume can be quickly and accurately calculated The Stereopycnometer is the standard model of the series of manually operated pycnometers. It offers a choice of two interchangeable sample cells used in conjunction with a single reference volume. A sample is placed in the sample cell and degassed by purging with a flow of dry gas, by vacuum, or by a series of pressurization cycles. The analysis is performed by pressurizing the sample cell to approximately 17 psi and recording the value. The selector valve is rotated so the gas expands into the reference or added volume and that lower pressure is recorded. From these two readings the sample volume can be quickly and accurately calculated. If samples are compressible foams, the cell-to-reference pressure sequence of the Stereopycnometer is the preferred method over that employed by the Multipycnometer. Features Sample size range from 5 cc to 135 cc Two interchangeable sample cells Manually Operated Gas Pycnometers Gas Recommendations: Ultrahigh purity compressed gas with outlet pressure of 20 PSIG. Helium is standard. Nitrogen or SF6 are alternate gases for helium permeable materials. Precision: Digital pressure display resolution of 0.001 pounds per square ( psi) Accuracy: Better than 0.2% ( when properly prepared, thermally equilibrated, and sample occupies greater than 75% of nominal sample cell volume) . Calibration: Metal spheres ( provided) by cell size: 4.5 cm3 Cell: 2 spheres, 1.0725 cm3 each 135 cm3 Cell: 1 sphere, 56.5592 cm3 Options: • N.I.S.T. certification of a sphere diameter • Non-elutriating cells for fine powders • Stainless steel cells for durability • Fiber/ film winding spool. Fits 20 cm3 cell. Physical: Weight 24 lbs. ( 10.9 kg) Width 11.8” ( 30 cm) Depth 18.5” ( 47 cm) Height 7.1” ( 18 cm) Power: 100/ 240 V; 50/ 60 Hz
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