Decagon EC-5 Operator's Manual
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5 COLLECTING DATA EC-55 Collecting Data5.1 Data Logger RequirementsThe EC-5 sensor is designed to work most efficiently with Decagon’s5-channel Em5b, Em50, or ProCheck handheld readout. All Decagonreadout devices use a 3.0 V excitation.The sensors however, may be adapted for use with other data loggers,such as those from Campbell Scientific, Inc., for example. The EC-5requires an excitation voltage in the range of 2.5 to 3.6 V. The sensorsproduce an output voltage that depends on the dielectric constantof the medium surrounding the sensor, and ranges between 10 and50% of the excitation voltage. Any data logger which can produce a2.5 to 3.6 V excitation with approximately 10 millisecond durationand read a volt level signal with 12-bit or better resolution should becompatible with the EC-5 sensor. The current requirement for theEC-5 is 10 mA at 2.5 V.We designed the EC-5 sensor for use with data loggers and read-out devices that provide short excitation pulses, leaving the sensorsturned off most of the time. Continuous excitation not only wastesbattery power, but may, under certain circumstances, cause the sen-sor to exceed government specified limits on electromagnetic emis-sions. Do not continuously power the EC-5 sensor.5.2 Sample ProgramThe following program is an example that can be used with theCampbell Scientific CR10X data logger and our EC-5 sensor at a2,500 mV excitation:;{CR10X}; Example ECH2O Data Logger Program for CR10X; Wiring:10 |
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