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0 <br />u <br />1 <br />ECH2O Probe User's Manual <br />Z Introduction <br />1. Introduction <br />Welcome <br />Welcome to the ECE20 Dielectric Aquaxneter sensors <br />for measuring soil water content. These innovative sen- <br />sors will enable you to monitor soil moisture accurately <br />and affordably. <br />71 <br />Specifications <br />Measurement Time: 10ms (milliseconds) <br />Accuracy: <br />EC10 andEC20. <br />+.04 m3 /m3 (±4%) <0.5 dS/m <br />With soil -specific calibration: ±.02 m3 /m3 (±2%) <br />ECS: <br />at least 0.003 m3/m3 all soils, up to 8 dS/m <br />With soil -specific calibration: ±.02 m3/m3 (±2%) <br />Resolution: <br />E C 10 and E C20. 0.002m3/m3 <br />E C 5: 0.001 m3/m3 VWC in mineral soils, 0.25% in <br />growing media <br />Power: <br />R*rmrw: <br />EG 10 and EG20: 2.5VDC @a 2mA to 5VDC @a 7mA <br />EG5:3VDC@a 10mA <br />Org10-40% of excitation voltage (250-1000mV at <br />2500mV excitation) <br />Operating Environment: <br />EC 10 andEC20. 0 to 50°C <br />1 <br />71 <br />