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Table of Contents
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1
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2
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3
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4
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5
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6
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6.1
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6.2
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6.3
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7
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8
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9
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10
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11
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12
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13
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6.3 Data Compensation
Click the Data Compensation icon  to open the Data Compensation Wizard. The Data Compensation Wizard is shown in Figure 6-8.
In the first window of the wizard, the user identifies the currently opened file type. There are two file types: Barometric files (data that is retrieved from a Barologger) and Submerged Levelogger files (data that is retrieved from LT, LTC Levelogger or Levelogger Gold). After the selection of the file type, click Next and the Data Compensation selection window will open.
There are four data compensation options available: Barometric Compensation, Manual Data Adjustment, Density Adjustment and Barometric Efficiency.
- Barometric Compensation requires the Barometric file and the submerged Levelogger file and simply involves subtraction of the barometric reading from the Levelogger reading. If there is an inconsistency of the time stamp between the Barometric file and the Submerged Levelogger file, a linear approximation on the barometric data will be performed.
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- Manual Data Adjustment requires the user to select the Reference Time from the data file and enter the new reading in the Reference Datum to replace the original level reading of that selected Date/Time. The user can use this field to adjust the data by an offset value by inputting the Reference Datum value for that time when the offset is incorporated. Please note that the value input in Reference Datum field will become the actual finished data point at that date/time. Therefore, the program computes a correction factor to adjust the existing data value after the other requested compensations such as barometric or density compensations, are performed. This correction factor is then applied to all the data from that file after other compensations are performed.
- Density Adjustment corrects the range of the level channel in the data file based on a user input adjustment of fluid density. The adjustment formula is stated in section 5.1. The density range can be set from 0.90 to 1.10.
- Barometric Efficiency Adjustment is used to proportionally adjust Barologger data in relation to a particular Levelogger. Barometric efficiency is often expressed as a percentage or proportion. The input field is proportional and has a default value of 1.00. For more information about Barometric Efficiency, see Section 9.1.3. The barometric efficiency can be set from 0.01 to 3.00.
The compensated data will be saved in a new *.lev file. The default file name will be the <Submerged Levelogger file name> with the word <compensated> added to the file name prefix. Alternatively, the user can name the compensated file. Do not change or delete the file extension.
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