AccuPyc

Micromeritics
AccuPyc II 1340 Configurations and Options

 

Configurations

To ensure best fit with your sample, the AccuPyc is available in multiple configurations. Best fit means your sample nearly fills the sample chamber and, therefore, optimizes the precision of your results.

  • 1-cm3 sample chamber
  • 10-cm3 sample chamber
  • 100-cm3 sample chamber
  • 350-cm3 sample chamber

Temperature Control Option

The temperature-control unit is specifically designed for temperature-sensitive materials. This unit permits collection of volume/density data at a user-specified temperature. A temperature-control unit to which an external bath is connected is available in the following configurations:

  • 10-cm3 sample chamber
  • 100-cm3 sample chamber
Glove Box Option

This unit consists of two separate modules. The controller is placed outside the glovebox, while the analysis module is placed inside the glove box. If you have an existing AccuPyc II 1340, you can order the glove box analysis unit containing the desired sample chamber and simply connect it to the connector provided on the rear panel of the existing AccuPyc II.A glove box unit for analysis of samples in which a controlled environment is required is available in the following configurations:

  • 1-cm3 sample chamber
  • 10-cm3 sample chamber
  • 100-cm3 sample chamber
  • 350-cm3 sample chamber
FoamPyc Option

The AccuPyc II 1340 unit can be ordered with the FoamPyc application installed. If you have a standard AccuPyc II 1340, 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-control pycnometers:

  • 10-cm3 nominal cell volume
  • 100-cm3 nominal cell volume (for conformance to ASTM and ISO methods)

MultiVolume Option

A MultiVolume option allowing you to analyze smaller-sized samples with your current AccuPyc model is available for the following configurations:

  • 1-cm3 nominal cell volume, contains a 0.1-cm3 cup
  • 10-cm3 nominal cell volume, contains 1- and 3.5-cm3 cups
  • 100-cm3 nominal cell volume, contains 10- and 35-cmcups

AccuPyc Applications

Density Applications

Reducing the weight of some products is often desirable for performance as well as economic reasons. Many manufacturers strive to develop materials that are partially porous yet still fulfill their functions. Density measurements play a key role in these developments. In other products, preventing porosity is important. Closed air bubbles (cells) are desirable in home-insulating materials but an open cellular structure is required for automobile and furnace filters. Producers thus keep a check on closed and open cells by density evaluation.

A noted decrease from a reference value can indicate a void within the product, an undesirable situation for some manufactured products such as those composed of laminates. An increase in density of a polymer increases as it approaches its crystalline state.

The number of industries that depend on density determination is extensive. In the agriculture industry, the density of grains, feeds, tobacco, fertilizer, insecticides, and soil samples are measured. The ceramic industry uses density and specific gravity measurements on ceramic whiteware materials. In the pharmaceutical

industry, density measurements are correlated with solubility rates of powders and tablets.
The production of construction materials such as insulation, bricks and tile requires the determination of absolute density. The manufacture of carbon and graphite requires bulk density measurements. Studying the reaction rate of porous catalysts is augmented by measurements of particle density and volume. Other industries that benefit from density measurement include plastics, glass, powder metallurgy, paint, textile and pulp and paper.

From raw material to finished product, density measurements support a wide variety of industrial needs. Micromeritics’ experience in the field of density measurement began in 1961, when we introduced our first hand-operated helium pycnometer. In 1981 we developed the first commercial automatic gas pycnometer. Today, Micromeritics is a leading provider of instruments that determine density. We support these products with a worldwide network of personnel trained in applications and service support. Our pycnometers deliver fast, accurate, and reliable measurements to determine absolute, envelope, and bulk density measurements.

Partial list of materials that utilize density determination:

  • Carbon Black
  • Carbon Cloth
  • Catalysts
  • Cement
  • Ceramic
  • Clay
  • Coating powder
  • Coke
  • Dolomite
  • Film
  • Foam
  • Graphite
  • Iron oxide
  • Kaolin
  • Lactose
  • Limestone
  • Metal parts
  • Nickel
  • Pigment
  • Polyester fiber
  • Quartz
  • Resins
  • Silica
  • Starch
  • Talc
  • Tungsten carbide
  • Zeolite
  • Zinc oxide 

Typical AccuPyc II 1340 Applications

Pharmaceuticals – Composition of active and excipient ingredients can be monitored and controlled through determination of product density. Polymorphic, hydrated, and amorphous forms of products, as well as purity, can be determined by comparing measured density with theoretical and historical values.

Coatings – Dried film density can be used in determination of Volatile Organic Compound (VOC) content of clear and pigmented coatings. VOC reporting is required by government regulations. In addition, total solids content can be used to determine minimum coverage obtainable with different coating blends. Mixtures of dry pigments can be monitored by comparing measured density with theoretical density based upon composition of the mixture..

Calcination – Many materials undergo structural rearrangement through pressure or temperature treatment, or both. Conversion level can be monitored through density measurement during and at the end of processing. SPC reporting of results facilitates monitoring of product control. Applications include different crystal structures of carbon and ceramics..

Organic chemicals and polymers – Polymerization and organic reforming processes are used to produce desired compounds from raw materials. Conversion and purity can be monitored by comparing measured density to theoretical density of the desired product..

Ceramics and powder metallurgy – Density measurements can be used to determine closed porosity from casting, sintering, and forging operations where parts are made from powdered samples. If the density of the finished part is significantly less than that of the constituent powder, closed pores have formed during the part processing.

Rigid cellular plastics – Closed-cell rigid plastics (foams) exhibit different properties based upon the ratio of open and closed cells. Insulation foams limit thermal conductivity through pockets of trapped gases contained within closed pores. Flotation devices, likewise, owe buoyancy to closed air-filled pores that prohibit water entry..

Plastic films – Plastic films are produced through extrusion of plastic beads. Film quality is related to the amount of encapsulated air in the starting beads. Density can be used to determine the quantity of entrapped air. In addition, the degree of crystallinity of the final film can be determined using density. Brittleness of the film increases with crystallinity, while strength decreases..

Slurries – With knowledge of the dry powder and suspending liquid densities, the quantity of liquid in a slurry mixture can be calculated by measuring the density of the slurry. Generally it is expensive to ship excess liquid in slurries, and then to remove suspending liquid before casting operations. On the other hand, too little suspending fluid can lead to difficulty in transporting the slurry due to unfavorable rheological properties of the slurry when the solids content is too high. These rheological properties can be monitored by measuring the density of the slurry..

Blending of materials– Many powder products are shipped and used as blends of primary ingredients. The accuracy and reproducibility of the blend can be monitored by comparing the measured densities to the expected density based upon the target recipe of primary ingredients. The high degree of accuracy and precision of the AccuPyc helps ensure that the blends produced at a given plant match the desired recipe, the previous lots of materials, and those from other locations, regardless of the industry where these blends are used..

 

 

AccuPyc II 1340 Software and Data Presentation

Software and Data Presentation

The AccuPyc II 1340 can be operated with a keypad or an optional Windows interface that provides exceptional reporting and archiving capability. Both versions include direct sample mass input from an analytical balance and cycle-based displacement volume reporting. With the Windows interface, features such as time-based pressure equilibration reporting and additional calculations such as percent solids content and total pore volume are included. Operational status can also be continually monitored in a status window on the monitor screen.

User-selected reports include :

  • Summary Report
  • User-Defined Tabular Reports
  • Volume vs. Cycle #
  • Density vs. Temperature
  • Total Pore Volume vs. Time
  • Density vs. Cycle #
  • Options Report
  • Equilibration Report
  • Sample Log
  • Combined Report

 

AccuPyc II 1340 Technique Overview

The AccuPyc works by measuring the amount of displaced gas. 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. Gas molecules rapidly fill the tiniest pores of the sample; only the truly solid phase of the sample displaces the gas. A sample chamber of 1 cm3, 10 cm3, 100 cm3, or 350 cm3 can be selected to provide the best fit with your samples.The run precision mode allows you to achieve high repeatability. The instrument automatically purges water and volatiles from the sample and then repeats the analysis until successive measurements converge upon a consistent result.

 

 

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