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Drain Gauge User's Manual <br />4. Collecting Data <br />3. If your data logger is programmed to wait too long <br />between readings, you may miss a flushing event. <br />Connect the wires from the pigtail adapter to the data log- <br />ger as shown, with the supply wire (white) connected to <br />the excitation, the analog out wire (red) to an analog input, <br />and the bare ground wire to ground: <br />Analog <br />Supply out Ground <br />Exc. H L G <br />Analog <br />In <br />Datalogger, <br />Fig. 5. Datalogger configuration <br />Drainage r <br />Analysis, <br />The Drain Gauge is designed with a flush volume of 31 <br />cm3, ±10%. If the sampling area is taken as the surface <br />area of the opening in the divergence control tube (310 <br />cm2), each flush event corresponds to 1 mm of drainage. <br />Em50 loggers with firmware v 1.9 and greater will auto- <br />matically recognize the Drain Gauge, and keep a running <br />count of Drain Gauge flushing events (see reading the <br />Drain Gauge with Em50 loggers). With other data acquisi- <br />24 <br />