Adsorptive Properties
In 21CFR11 environments, this section is applicable only to members of the Developer group, however, members of the Analyst group may find information in this section helpful. Parameter file information that is available to Analysts is created by a member in the Developer group using information in this section. |
File > Open > [.ADP File]
(or click Edit next to the Adsorptive selection on the Analysis Conditions tab when in Advanced option presentation)
Adsorptive properties provide the adsorptive (analysis gas) characteristics for the analysis.
Field or Button | Description | ||
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Adsorbate molecular weight [text box] | The molecular mass is used for the weight % column of the isotherm tabular report and for the pressure composition isotherm plot. | ||
Adsorbed-phase free-space correction |
Adsorbed molecules occupy volume in the sample tube, reducing the analysis free space. Select Adsorbed-phase free space correction to adjust the reported quantity adsorbed to correct for this effect. This option is appropriate for all sample analyses that use the real gas equation of state. | ||
Adsorptive [text box] | Name of the adsorptive gas whose properties are being defined. | ||
Density Conversion Factor [text box] | Factor determined by obtaining the ratio of the gas density (STP) to the liquid volume. |
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Dosing Method |
Normal. Dose from a pressurized tank of gas attached to a gas inlet port.
Vapor source. Select if a container of condensed vapor is to be attached to the Psat port in place of the Psat tube and is dosed from the Psat port. |
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High-resolution fluid properties [selection] | Use to import parameters from a Fluid Properties (.FPI) file. Changing fluid properties should only be necessary if an adsorptive is to be used for which no adsorptive properties are provided. Contact Micromeritics Scientific Services if new fluid properties are required. |
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Ideal gas law with non-ideality correction [selection] |
Use if there is no compressibility table for the gas being used or if you want to match existing data. This factor adjusts the ideal gas law for calculating the quantity of gas in the cold free space. Most gases are nearly ideal near room temperature and at pressures not much above atmospheric pressure, so the cold free space is where the correction is most important. If selected, enter the non-ideality factor field. | ||
Mass flow constant ![]() |
Scaling factor for the Mass Flow Controller measured flow rate. Applicable only for the gas used in the flow prep tasks. The default is preset for gases provided with the application. See Chemical Adsorption Tasks. | ||
Maximum manifold pressure [text box] | The highest pressure to which the manifold will be dosed. To avoid damage to the analyzer, this number is limited to 925 mmHg. Low pressure sources will require lower numbers. For gases to be used for dosing after charging a tube from a gas inlet, enter the maximum pressure for dosing from the inlet, not from the tube of condensate. | ||
Mnemonic [text box] | Enter the mnemonic name for the adsorptive. |
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Molecular cross-sectional area [text box] | The area that a single adsorbed molecule occupies on the surface of the sample. It is used in surface area calculations. | ||
Non-condensing Adsorptive [check box] | Select if using a non-condensing analysis gas. When selected, the Density conversion factor field and the PSAT vs T button are disabled. | ||
Psat vs T [button] | Click to edit the Psat vs Temperature table. The table contains saturation pressures and their corresponding temperatures. To edit, click in a field and enter the value. | ||
Therm. tran. hard-sphere diameter [text box] |
An estimate of molecular size used in calculating the thermal transpiration correction. |
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