Decagon GS3, Руководство оператора

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1 INTRODUCTION GS3
1.2 Specifications
Volumetric Water Content
Accuracy: ε
a
:
±
1 ε
a
(unitless) from 1 to 40 (soil range),
±
15% from
40 to 80:
•
Using a generic calibration:
±
0.03
m
3
m
3
(
±
3% VWC) typical
in mineral soils that have solution electrical conductivity < 5
dS/m
•
Using medium specific calibration,
±
0.01 to 0.02
m
3
m
3
(
±
1 to
2% VWC) in any porous medium
Resolution:
•
ε
a
: 0.1 ε
a
(unitless) from 1 to 20
•
< 0.75 ε
a
(unitless) from 20 to 80
•
0.002
m
3
m
3
(0.2% VWC) from 0 to 40% VWC
•
0.001
m
3
m
3
(0.1% VWC) > 40% VWC
Range: Apparent dielectric permittivity ( ε
a
): 1 (air) to 80 (water)
Bulk Electrical Conductivity
Accuracy:
±
5% from 0 to 5 dS/m,
±
10% from 5 to 23 dS/m, user
calibration required above 10 dS/m
Resolution: 0.001 dS/m from 0 to 23 dS/m
Range: 0 to 25 dS/m (bulk)
Temperature
Accuracy:
±
1
◦
C
Resolution: 0.1
◦
C
Range: -40 to 60
◦
C
General Specifications
Dimensions: 9.3 x 2.4 x 6.5 cm
Prong Length: 5.5 cm
Dielectric Measurement Frequency: 70 MHz
Measurement Time: 150 ms (milliseconds)
Power requirements: 3.6 to 15 VDC, 0.03 mA quiescent, 25 mA dur-
ing 150 ms measurement
2