EC-20, EC-10 and EC-5 User’s Manual
4. Collecting Data
11
4. Collecting Data
Datalogger Requirements
The EC-20, EC-10 and EC-5 sensors are designed to
work most efficiently with Decagon’s 5-channel Em5b,
Em50, ProCheck or ECH
2
O Check handheld readout.
All Decagon readout devices use either a 3.0V or 5V
excitation.
The sensors however, may be adapted for use with other
dataloggers, such as those from Campbell Scientific,
Inc., for example. The EC-10 and EC-20 sensors require
an excitation voltage in the range of 2 to 5 volts. The
EC-5 requires an excitation voltage in the range of 2 to
3.6 volts. The sensors produce an output voltage that
depends on the dielectric constant of the medium sur-
rounding the sensor, and ranges between 10 and 50% of
the excitation voltage. Any datalogger which can pro-
duce a 2.5 to 5V (2.5 to 3.6V for EC-5) excitation with
approximately 10 millisecond duration and read a volt-
level signal with 12-bit or better resolution should be
compatible with the EC-20, EC-10 and EC-5 sensors.
For the EC-10 and EC-20 sensors, the current require-
ment at 2.5V is around 2mA, and at 5V it is 7-8mA. For
the EC-5, it is 10mA at 2.5V.
NOTE:
EC-20, EC-10 and EC-5 are intended only for
use with dataloggers and readout devices which can
provide short excitation pulses, leaving the sensors
turned off most of the time. Continuous excitation not
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