Intek RheoVac 950 - Manual (Page 18)

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3.6 DATA PROCESSING
TABLE IV. Column H eadings for Data Downloads and Archived Data*
Time
Stamp
(Time of
day)
Actual
Volume
Flow
(ACFM)
Total Mass
Flow
(lbs/hr)
Water
Vapor
Flow
(lbs/hr)
RheoVac
Pressure
("Hg abs)
Water
Vapor Sp.
Vol.
(Cu. ft/lb)
Water to
Air Mass
Ratio
(lb/lb)
Relative
Saturation
(%)
H
2
O
Partial
Pressure
("Hg abs)
Air Flow
In-Leak
(SCFM)
Probe
Temp. (°F)
0 1 2 3 4 5 6 7 8 9 10
* See Custom Information section (Section 6) for custom units of measure.
A very important part of understanding your condenser system comes from evaluating the data that is
created and stored by the RheoVac instrument. The ability to evaluate data has been greatly enhanced
with the RheoVac Model 950 by providing nearly unlimited data storage capacity. A data file is created
for each calender day that the monitor is operating. The ability to review stored data has been invaluable
when troubleshooting condenser problem s.
The importance of reviewing graphed data cannot be overstated. Reviewing data for normal operating
conditions will greatly decrease the time needed to troubleshoot problem conditions when they arise. To
simplify the graphing process, an Excel add-in has been created by the technical support team at Intek
and is included with your RheoVac user software. This Excel add-in graphing utility, called
RheoGraph, is an automated graphing macro that imports and graphs RheoVac data files.
The RheoGraph utility is contained in a self-extracting zip file called “InstallRheoGraph.exe” on the
User Interface software CD. Executing the file will begin the menu driven installation process. The
default installation path is to C:\RheoV ac, do not change this path nam e during installation. The file
RheoGraph.xla will be copied to the installation folder along with help files, sample data, and a readme
text file. Microsoft Excel is required for the add-in to function.
Executing RheoGraph.xla will launch Excel and the graphing menu w ill appear. Selecting Auto will
prompt the user to enter Company, Plant, and Unit info, which will be placed in the graph titles. Then
the user is prompted to browse to the data file to be graphed. The data will be inserted into a spreadsheet
page and four graph pages will then be automatically added as separate tabs in the workbook. When the
graphs are com plete, macro execution terminates.
Several advanced features are available by selecting A dvanced on the Auto Start menu. For additional
help, use the keyboard arrow keys to set focus on any button, then press F1. The following is an example
of one of the graphs made by RheoGraph showing air in-leak and water vapor to air mass ratio.