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Drain Gauge User's Manual <br />4. Collecting Data <br />NOTE: Be aware that cutting off the cable plug or <br />cutting the cable in any other way will void your war- <br />ranty, since the plug and cable are both specially <br />engineered for optimal performance and noise reduc- <br />tion. <br />Extension cables <br />Decagon supplies 50 -foot (15.25m) and 10 -foot (3m) <br />extension cables to attach to the sensor cable. You can <br />safely connect up to 5 of the 50 -foot cables without signif- <br />icant signal attenuation. For most applications, you will <br />want to seal the connections from the elements to main- <br />tain a good connection and to prevent corrosion. To <br />waterproof the connectors, connect the extensions, then <br />coat the connection with silicone sealant. Next, cover the <br />connection with heat shrink and shrink it over the un- <br />cured sealant. <br />Datalogger Requirements <br />Decagon Em50, and Em50R loggers <br />The Drain Gauge's sensor is designed to work efficiently <br />g g Y <br />with Decagon's 5 -channel Em50 data logger with firm- <br />ware version 1.9 or higher. The Em50 automatically recog- <br />nizes the Drain Gauge and keeps a running total of <br />drainage since the last time the data logger memory was <br />erased. The Em50 will output the cumulative drainage in <br />units of 0.1 mm. For example, if the Drain Gauge has <br />experienced 7 siphon flushes and the siphon chamber is <br />half full at the time of measurement storage, the output <br />would be 75, indicating 7.5 mm of drainage. The total <br />drainage will not reset to zero when data are downloaded <br />22 <br />i <br />