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Drain Gauge User's Manual <br />2. Installing the Drain Gauge <br />2. Cut a small trench between the Drain Gauge site and <br />the valve box installation site (we recommend this step <br />be completed before replacing the surface vegetation <br />on top of the Drain Gauge). <br />3. Lay the sensor wire and calibration and sampling tubes <br />in the trench and recover them. <br />4. Place the valve box into the hole and arrange the tubes <br />so they can be easily accessed. <br />When the Drain Gauge's read circuit is excited by 2.5 <br />volts, the sensor output with a dry sampling chamber <br />should be — 10 mV, and the output when full should be <br />—120-125 mV. The siphon does not drain the .measure- <br />ment reservoir completely, so the sensor should read —30 <br />mV after a siphon event. Each of these values can vary ± <br />10% from instrument to instrument. If the probe output <br />isnot between 10 and 135 mV, check to be sure the sensor <br />wire was not damaged during installation. If you do not <br />see a flushing event after. injecting water into the calibra- <br />tion tube, pull air into the syringe and inject it into the <br />tube. This should push all the water out of the sampling <br />tube and into the reservoir. <br />i `• i i >: i •F <br />The sample reservoir collects water from the measure- <br />ment reservoir after each flush. Solution can be retrieved <br />from the sample reservoir through the blue sampling <br />tube. Insert a 60cc syringe (included) into the sampling <br />tube and slowly pull back on the plunger. If liquid is <br />present in the sampling reservoir, it should slowly begin <br />12 <br />