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0 <br />0 <br />n <br />i F <br />u <br />u <br />n <br />11 <br />F� <br />ECH2O Probe User's Manual <br />2. About the ECH2O Probes <br />Fig. 3); the white wire is excitation, red is output, and the <br />bare wire is ground. <br />Analog out (Red) <br />Sensor cable Ground (Bare) <br />iEE <br />Excitation (White) <br />rr= <br />• <br />Decagon supplies 50 -foot (15.25m) and 10 -foot (3m) <br />extension cables for use with the ECH20 probe. You can <br />safely connect up to 4 of the 50 -foot cables without signal <br />attenuation. For most applications, you will want to seal <br />the connections from the elements to maintain a good <br />connection and to prevent corrosion. <br />7 <br />