<\/p>\n

If an on-site Barologger is not available, your data can be compensated using alternate barometric data (e.g. from a local weather station).<\/p>\n

To accomplish an accurate manual barometric compensation, the atmospheric pressure station should not be greater than 30 km (20 miles) away<\/strong>.\u00a0<\/span><\/p>\n

You should include the elevation difference between the weather station and Levelogger<\/strong> in your calculation (Step 1 below). As elevation increases, barometric pressure decreases at a rate of approximately 1.21\/1000 ft or meters. This rate can be shown as Elevation\/826.<\/p>\n

In addition, the date and time of the barometric data should cover the range of data collected<\/strong> by the Levelogger.\u00a0<\/span><\/p>\n

Next, your Levelogger data and barometric data must be in the same units<\/strong>\u00a0 <\/span>(Step 2 below), and assure that any offsets or normalization values are accounted for.\u00a0<\/span><\/p>\n

Although not shown in our example, it is also important to remember that weather station barometric data will often contain a different offset or normalization. Manual data conversion and barometric compensation should account for any variation of the normalization or offset used between the barometric data sourced and Solinst Leveloggers.<\/p>\n

Once the final calculated barometric pressure values are obtained, they are subtracted from the Levelogger data set<\/strong> (Step 3 below). Since the Levelogger data can be easily exported as a .csv\u00a0 <\/span>or .xml file using Levelogger Software, all manual corrections can be performed in external programs.<\/p>\n