You are here: Sample and Parameter Files > Parameter Files > Analysis Conditions

Analysis Conditions

(or click the Analysis Conditions tab when in Advanced option presentation)

Analysis conditions specify the parameters used to guide an analysis.

Analysis Conditions Fields and Buttons Table
Button Use to Specify...
Autocalculate Reverberi pressures [selection]

Select to have the application automatically use the Reverberi pressures. Selecting this option disables the pressures table. Click Options to enter additional Reverberi options.

Enter target pressures [selection] Select to manually enter pressures into the table.
High Pressure [group box]

Equilibrate by. Select the option for equilibration based on elapsed Time (in seconds) or decrease in Rate of intrusion (or extrusion) in mL/g per second.

Scan by:

  • Pressure. The analyzer goes through a sequence of segments, with each segment starting at the end of the previous one. Each segment ends at the specified pressure. The pressure is programmed to increase or decrease at a rate to give a constant time per decade of pressure. Along the way, the analyzer takes intrusion points at the specified number of points per decade, ending at the specified ending pressure. Also, any points in the pressure table, as well as points separated by the maximum intrusion volume, are collected.
  • Intrusion. The analyzer goes through a sequence of segments, with each segment starting at the end of the previous one. Each segment ends at the specified pressure The pressure rate is the maximum achievable safe rate (up to 0.5 min/decade) and is programmed to increase or decrease at a rate to give a constant intrusion / extrusion rate. The analyzer takes intrusion points at the specified number of points per decade, ending at the specified ending pressure. Also collected are points in the pressure table, as well as points separated by the maximum intrusion volume.

If both high pressure ports are in use, they may have different intrusion rates. In this case, the left port (port 1) determines when data are collected. The right port collects data at the same times as the left. This allows a differential analysis to be performed in this mode.

  • Hold at maximum pressure. Enter additional amount of time to remain at the maximum pressure in a pressure table intrusion segment before beginning extrusion.
Low Pressure [group box]

Evacuation . Select if the sample is a Formed solid, Powder, or Other. If Other is selected, the remaining fields are enabled. This window is also available from Unit [n] > Evacuate Low Pressure.

  • Initially evacuate at. Enter the initial maximum evacuation rate.
  • Switch to medium at. Enter the method and pressure the system must reach before medium evacuation begins.
    • Use pressure transducer
    • User vacuum gauge
    • Skip medium evacuation
  • Switch to fast at. Enter the pressure the system must reach before fast evacuation begins.
  • Evacuation target. Enter the evacuation pressure.
  • Continue evacuating for. Enter the evacuation duration.

Filling pressure. The penetrometer is filled with mercury at this pressure. It is recommended to set the filling pressure slightly lower than the first low pressure point on the pressure table.

  A filling pressure of at least 0.5 psia is recommended. Because mercury generates pressure and because fill pressures less than 0.5 psia can fail to fill the corner radii and gaps between the glass and sample in the penetrometer, using a lower pressures may reduce the accuracy of data.
  If the filling pressure is higher than any point in the table, an error message occurs. Delete the pressures lower than the filling pressure or change the filling pressure.

Equilibrate by. Select the option for equilibration based on elapsed Time (in seconds) or decrease in Rate of intrusion (or extrusion) in mL/g per second.

Mercury [button]

Enter the mercury properties. Mercury properties may change with variations in temperature.

Advancing contact angle. Enter the advancing (intrusion) contact angle.

Receding contact angle. Enter the receding (extrusion) contact angle.

Surface tension. Enter the surface tension of mercury.

Density.

  • Enter. Select to manually enter a density.
  • Calculate from the measured temperature. Select to use the entries in the table.
  • Linear compressibility. Enter the linear compressibility coefficient.
  • Quadratic compressibility. Enter the quadratic compressibility coefficient.
Table Options

Last Low Pressure. Select the row to indicate the last low pressure.

Starting Pressure. This column is not editable. The data are taken from the Ending Pressure of the preceding row and the Filling Pressure for the first row.

Pressure Increment. Enter the pressure increment for this segment if a sequence of linearly spaced pressures is preferred. Either the Pressure Increment or Points Per Decade can be specified. If one is entered, the other is automatically set to zero and displayed as blank. By default, both columns are blank (zero) when a new row is inserted or appended. If both columns are blank, only the Ending Pressure will be used.

Points per Decade. Enter the number of points per decade for this segment if a sequence of logarithmically spaced pressures is preferred. Either the Pressure Increment or Points Per Decade (but not both) can be specified. If one is entered, the other is automatically set to zero and displayed as blank. By default, both columns are blank (zero) when a new row is inserted or appended.

Ending Pressure. Enter the ending pressure for this segment.

Maximum Intrusion. The analyzer automatically takes additional readings between points on the pressure table when this volume of additional intrusion is detected. Enter the intrusion volume per gram of sample that must be reached in order for additional data pair readings to be recorded. Use 0 to prevent readings between pressure points. See Use of the Maximum Intrusion Volume Option. The Maximum Intrusion entry is set to the same value as the preceding row by default when a new row is inserted or appended.

Scan Rate. If scanning by pressure, enter the minutes per decade for this segment. If scanning by intrusion, enter the intrusion rate for this segment. The Scan Rate column is set to blank (zero) and disabled for all rows up to and including the Last Low Pressure. If Scan By Pressure or Intrusion is selected, the column title will display the appropriate units (min/decade) or (mL/g-sec) and each high pressure row must contain a value. The value for the previous row is set by default when a new row is inserted or appended, or the default value (5 min/decade or 0.001 mL/g-sec) for the first high pressure row.

Insert Range. Click to display the Enter Pressure Range window for entering parameters for the system to autofill the table with starting pressure, ending pressure, and the number of points to insert within the specified range.

  For fields and buttons not listed in this table, see Common Fields and Buttons.
 
   Micromeritics Learning Center    Contact Us

Copyright © 2014 - 2017. Micromeritics Instrument Corporation. All rights reserved.