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r� <br />'J <br />L' <br />r <br />L <br />u <br />r� <br />0 <br />U <br />Drain Gauge User's Manual <br />4. Collecting Data <br />trol tube during installation (contact Decagon for <br />additional Bio -barrier). <br />If you are confident that the drain gauge will be installed <br />well below the potential root zone, or are concerned about <br />the presence of trace amounts of Trifluralin in your solu- <br />tion analysis, the Bio -barrier fabric can be easily removed <br />before installation. Simply remove the retaining ring and <br />fiberglass filter that sit above the wick, and remove the <br />Bio -barrier (green fabric with the black knobs) that sits <br />below the un -woven portion of the wick. Be sure to evenly <br />spread the unwoven wick portion and re -fasten the fiber- <br />glass filter with the plastic retaining ring before installing <br />the drain gauge. <br />NLO I I I MOW= <br />The following is an abbreviated program that can be used <br />with a CR10X data logger. This program outputs the raw <br />mV output from the water level sensor during flushing <br />events so that the flush volume can be calculated during <br />post -processing, using either a factory supplied or custom <br />calibration. The program additionally samples water level <br />sensor mV signal once per hour. <br />;(CR10X} <br />;Drain Gauge Program <br />;This short program is designed to limit the <br />;amount of program memory used <br />;Note: due to minimization, this program <br />;requires significant post -processing <br />;Siphon chamber water level mV data are <br />;output every hour. Additional water <br />;level data are output during each siphon <br />;chamber flushing event. Drainage is <br />;calculated using the methods discussed <br />;earlier in the manual <br />*Table 1 Program <br />01: 1 Execution Interval (seconds) <br />2% <br />