ACCUPYC II 1345
16Pages

Effective Solutions for Material Characterization

ACCUPYC II GAS DISPLACEMENT PYCNOMETRY SYSTEM Gas pycnometry is recognized as one of the most reliable techniques for obtaining true, absolute, skeletal, and apparent volume and density. This technique is non-destructive as it uses the gas displacement method to measure volume. Inert gases, such as helium or nitrogen, are used as the displacement medium. Density calculations using the gas displacement method are much more accurate and reproducible than the traditional Archimedes water displacement method. The AccuPyc II 1345 Series Pycnometers are fast, fully automatic pycnometers that...

APPLICATIONS Application Powder Metallurgy Results of many intermediate and final processing steps are controlled by or related to skeletal density of the metal. In addition, the performance of many sintered or cast metal structures may be predicted from the skeletal density of the starting metal powder. Refractory Materials True density is a useful value for: classification, detecting differences in chemical composition between supposedly similar samples, indicating mineralogical phases or phase changes, calculating total porosity when the bulk density is known, and for any other test...

On an elementary level, the volume of a solid material can be calculated by measuring its length, width, and thickness. However, many materials have within their structure surface irregularities, small fractures, fissures, and pores. Some of these voids or pores are open to the surface or closed within the structure of the solid material. Therefore, differences in the material volume depend on the measurement technique, measurement method, and the conditions under which the measurements were performed. PARTICLE VOLUME Assemblage of porous particles in a container Interparticle void A single...

Knowledge of the bulk density is of interest in package sizing, in calibrating volumetric feeders or applicators, and in determining the storage capacity of bins and transport vehicles. Apparent density information can be used in segregation studies and development of granulation processes. True density measurements are important in process control and the design of process equipment. MINING CORES Simple physical measurements of a circular core cylinder’s diameter and length allow the envelope volume to be calculated. A gas displacement pycnometer, with a larger sample chamber designed...

GAS DISPLACEMENT PYCNOMETRY PRINCIPLE OF OPERATION This technique uses the gas displacement method to measure volume accurately. Inert gases, such as helium or nitrogen, are used as the displacement medium. The sample is sealed in the instrument compartment of known volume, the appropriate inert gas is admitted, and then expanded into another precision internal volume. The pressures observed upon filling the sample chamber and then discharging it into a second empty chamber allow computation of the sample solid phase volume. Helium molecules rapidly fill pores as small as one angstrom in...

Inert gas flows Into sample chamber valve a opens then closes Equilibrium is reached Gas flows into second chamber for volume measurement valve b opens 4 Equilibrium is reached yet again 5 Volume divided into sample weight determines density 6 Pressure vented off to atmosphere valve c opens

HIGHLY ADAPTIVE SYSTEM The AccuPyc II Pycnometer consists of an integrated control and analysis module. For those who require high throughput, analysis modules are also available in a single configuration, allowing you to attach up to five additional analysis modules to a single controlling unit. Each module has its own gas connection. A variety of sample chamber sizes can be selected to provide the best fit with your samples. The run precision mode allows you to achieve high repeatability. The instrument purges water and volatiles from the sample and then repeats the analysis until...

DIRECT SAMPLE MASS INPUT Sample mass may be directly input from an analytical balance COREPYC Specialized unit with 2000-cm3 sample chamber size BAYONET CAP FITTING Provides superior repeatable seal compared to screw-type fitting

Research grade helium or nitrogen is strongly recommended. High purity carbon dioxide, dry air, or argon may be used. A multigas option for up to four gases on one analysis unit is available. * Subject to environmental operating conditions

HARDWARE VERSATILITY MULTIVOLUME KITS A MultiVolume option allowing you to analyze smallersized samples with your current AccuPyc model is available for configurations listed below. Each kit includes appropriate insert(s), reference standard(s), and sample cup(s). 2000-cm3 nominal cell volume 650- and 1300-cm3 cups 100-cm3 nominal cell volume 10- and 35-cm3 cups 10-cm3 nominal cell volume 1- and 3.5-cm3 cups 1-cm3 nominal cell volume 0.1-cm3 cup SOFTWARE VERSATILITY DATA PRESENTATION The AccuPyc II can be operated with a full keyboard or an optional Windows® interface that provides...

POROSITY SOLUTION TOTAL PORE VOLUME/PERCENT POROSITY BUNDLE PHARMACEUTICAL APPLICATIONS While skeletal and envelope volume measurements are each important on their own merit, their combination also allows you to accurately calculate percent porosity and total pore volume of a body. TABLET PRESS PHARMACEUTICAL RIBBONS Pharmaceutical scientists realize that many of the physical, mechanical, and pharmacokinetics properties of tablets are influenced by the basic settings of a tablet press. Using the AccuPyc coupled with the GeoPyc, scientists are now able to determine quickly and easily the...

OPEN- AND CLOSED-CELL FOAMS The AccuPyc II unit can be ordered initially with the FoamPyc application installed. If you have a standard AccuPyc, you can upgrade with a software enhancement. A FoamPyc option for measuring open- and closed-cell foam materials is available in the following configurations for the standard and temperature-controlled pycnometers: ■ 10-cm3 nominal cell volume ■ 100-cm3 nominal cell volume (for conformance to ASTM and ISO methods) Analysis Prior to Recutting Cycle* Pi P2 Volume Volume Elapsed Pressure Pressure (cm*) Deviation Time (psig) (ps^g) (cm*) (mm:$s) (psig)...