Particulate Systems HPVA Series, Руководство оператора, Страница: 56 / 124

Running the Macro HPVA Series Operator’s Manual
3-4 Mar 2011
Parameter Settings
Set Baseline Set this option to TRUE if a blank tube analysis was performed.
Otherwise, set it to FALSE.
When set to TRUE, this option corrects errors in an analysis by
using data collected from a blank tube analysis.
When set to TRUE, when you select Read Data File from the
HPVA menu, you will be prompted to:
• Select the analysis sample file
• Enter the dry mass of the sample
• Select the blank tube analysis sample file
To perform the correction, the slopes and intercepts of the lines of
best fit for the adsorption and desorption curves are calculated.
The system corrects the sample analysis file by subtracting out the
error found with the slope and intercept at each pressure point in
the isotherm using a volumetric basis.
This correction should only be used if the blank sample tube
analysis was performed at the same temperature, in the same
pressure range, and with the same sample tube and analysis gas as
the analysis performed on the sample.
Cryostat Correction Note: This setting applies to a ColdEdge cryostat. It has not been
verified with other brands.
Set this option to TRUE only if a cryostat was used for the
analysis. Otherwise, set the option to FALSE.
When a cryostat is in use with the instrument, the instrument reads
the sample temperature from the control box of the cryostat. The
control box reads the temperature from a temperature probe
within the sample well of the cryostat. The reading of this
temperature probe is approximately 1°C less than the true
temperature within the sample cell. This correction adds 1°C to all
sample temperature readings prior to all calculations.