The GeoPyc 1365 pycnometer automatically determines the volume and density of a solid object by displacement of DryFlo, a solid medium. The medium consist of a narrow distribution of small, rigid spheres that have a high degree of flow ability and achieve close packing around the object under investigation. The particles are sufficiently small that during consolidation they conform closely to the surface of the object, yet do not invade pore space.
Features and Benefits
| Pressure Measurement | |
| 12.7-mm (0.50 in.) ID | Sample volumes between 0.3 cm³ and 0.8 cm³ |
| 19.1-mm (0.75 in.) ID | Sample volumes between 0.8 cm³ and 2.4 cm³ |
| 25.4-mm (1.00 in.) ID | Sample volumes between 2.4 cm³ and 5.3 cm³ |
| 38.1-mm (1.50 in.) ID | Sample volumes between 5.3 cm³ and 13 cm³ |
| 50.8-mm (2.00 in.) ID | Sample volumes between 13 cm³ and 25 cm³ |
| Physical | |
| Height | 11 in |
| Width | 22 in |
| Depth | 15 in |
| Weight | 42 lbs |
| Electrical | |
| Voltage | 85 to 265 VAC |
| Frequency | 47 to 63 Hz |
| Power | 95 VA |
| Environment | |
| Temperature | 15 °C to 35 °C |
| Humidity | 20% – 80% |
The GeoPyc automatically determines the volume and density of a solid object by displacement of Dry Flo, a solid medium. The medium is a narrow distribution of small, rigid spheres that have a high degree of flow ability and achieve close packing around the object under investigation. The particles are sufficiently small that during consolidation they conform closely to the surface of the object, yet do not invade pore space.
Repeatability and reproducibility are achieved by a controlled method of compaction. The sample cell in which the dry medium is placed is a precision cylinder. A plunger compresses the powder as the cell vibrates; the force of compression is selectable and, therefore repeatable from test to test. A preliminary compaction with only the displacement medium in the cell establishes a zero-volume baseline.
The sample is then placed in the cylinder with the dry medium and the compaction process is repeated. The difference in the distance ht the piston penetrates the cylinder during the test and the distance h0 it penetrates during the baseline procedure (h=h0– ht ) is used to calculate the displacement volume of the medium using the formula for the volume of a cylinder of height h, V =π r2h
The GeoPyc is operated from an intelligent touch screen. Data acquisition and reporting are fully automated for convenient incorporation in LIMS or other data concentrating systems. A variety of sample chambers is available to accommodate a wide range of sample sizes. After the analysis, a light shaking or dusting completely removes the Dry Flo so the samples can be reused or retested.
The GeoPyc has multiple operating modes including full blank, computed blank, and reference solid calibration with variance, which allows you to optimize speed and accuracy for your individual needs. During analysis, indications of progress and preliminary results make it possible to track what is occurring.
The GeoPyc completes density analysis and automatically prints a report in 5 to 20 minutes, depending on user-selected parameters. This rapid sample turnaround makes the GeoPyc an ideal quality control tool for many industries. Reducing analysis time and/or analyzing a larger percentage of samples means that production can respond more effectively to quality standards, whether the goal is to maximize the porosity of catalyst substrate or to minimize the porosity of powdered metal objects.
The GeoPyc could be most useful, however, when a constant level of product porosity must be maintained within narrow specifications. The GeoPyc’s method facilitates quick identification and correction of changes in product porosity. The simple technique and fully-automated process are designed to minimize human error.
The GeoPyc is also convenient for most labs because it is quiet and compact, and requires only an electrical supply (no gases or liquids). A variety of materials ranging from highly porous to nonporous can be analyzed.
T.A.P. Density Option
The GeoPyc T.A.P. density option obtains precise results comparable to conventional tap density analyzers, only it does it faster, quieter, and with a higher degree of reproducibility.
When equipped with the T.A.P. Density option, the GeoPyc measures the packing volume and calculates the bulk density of granular and powdered samples, including pharmaceutical and electrochemical materials, under a wide range of compaction conditions.
To determine T.A.P. density, the sample chamber is rotated and agitated while a precise specified force is applied to the sample. A force transducer measures the consolidation force in Newtons and the distance over which the consolidation piston and plunger travel is measured in steps. The user specifies the force applied and the number of consolidations per analysis. The GeoPyc averages the measurements from each consolidation and automatically calculates volume and density, and reports the results in cm3 and g/cm3
