5TE Operator’s Manual
1. Introduction
1
1. Introduction
Thank you for choosing Decagon’s 5TE for measuring water
content, temperature, and EC. This manual is designed to help
you understand the probe’s features and how to use this
device successfully.
Specifications
Volumetric water content:
Range:
Apparent dielectric permittivity (
ε
a
): 1 (air) to 80 (water)
Resolution:
ε
a
:
0.1
ε
a
(unitless) from 1-20, <0.75
ε
a
(unitless) from 20-80
VWC:
0.0008 m
3
/m
3
(0.08% VWC) from 0 to 50% VWC
Accuracy:
(
ε
a
): ±
1
ε
a
(unitless) from 1-40 (soil range), ±15% from 40-80
(VWC):
•
Using Topp equation: ±0.03 m
3
/m
3
(±3% VWC) typical
in mineral soils that have solution electrical conductivity <
10 dS/m
•
Using medium specific calibration, ±0.01 - 0.02 m
3
/m
3
(± 1-2% VWC) in any porous medium
Electrical Conductivity (bulk):
Range:
0-23 dS/m (bulk)
Resolution:
0.01 dS/m from 0 to 7 dS/m, 0.05 dS/m from 7
to 23 dS/m
Accuracy:
±10% from 0 to 7 dS/m, user calibration required
above 7 dS/m
