Decagon Devices 5TE Manuel utilisateur
5TE
Water Content, EC
and Temperature Sensors
Operator’s Manual
Version 7
Version 7Version 7
Version 7
Decagon Devices, Inc.
2365 NE Hopkins Court
Pullman WA 99163
www.deca on.com
soils@deca on.com
©2007-2010 Deca on Devices, Inc.
All ri hts reserved
5TE Operator’s Manual
Table of Contents
i
Contents
1. Introduction . . . . . . . . . . . . . . . . . .1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . 1
Contact Information . . . . . . . . . . . . . . . . . . .2
Warranty Information . . . . . . . . . . . . . . . . . . 2
Seller’s Liability . . . . . . . . . . . . . . . . . . . . . .3
2. About t e 5TE . . . . . . . . . . . . . . . . 4
Background Info . . . . . . . . . . . . . . . . . . . . . .4
3.T eory . . . . . . . . . . . . . . . . . . . . . . 6
Volumetric Water Content . . . . . . . . . . . . . . 6
Temperature . . . . . . . . . . . . . . . . . . . . . . . . .6
Electrical Conductivity . . . . . . . . . . . . . . . . .6
Converting Bulk EC to Pore EC . . . . . . . . 7
Pore Water vs. Solution EC . . . . . . . . . . . . . . 9
4. Calibration . . . . . . . . . . . . . . . . . . 11
Dielectric Permittivity . . . . . . . . . . . . . . . . . 11
Mineral Soil Calibration . . . . . . . . . . . . . . . 11
Calibration in Non-Soil Media . . . . . . . . . . 12
5. Connecting to Logger . . . . . . . . .14
Connecting to an Em50/Em50R logger . . . 14
3.5mm Stereo Plug Wiring . . . . . . . . . . . . . . . . . . 15
5TE Operator’s Manual
Table of Contents
ii
Connecting to a Non-Decagon Logger . . . .15
Pigtail End Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 16
6. Communication . . . . . . . . . . . . . .18
Serial Communication . . . . . . . . . . . . . . . . . 18
Dielectric Permittivity . . . . . . . . . . . . . . . . . . . . . . . 19
Electrical Conductivity . . . . . . . . . . . . . . . . . . . . . 19
emperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SDI-12 Communication . . . . . . . . . . . . . . .20
Sensor Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
7. Installing t e Sensors . . . . . . . . 23
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Removing the sensors . . . . . . . . . . . . . . . . .26
Multiple sensor Installation . . . . . . . . . . . . . 26
8. Campbell Scientific Programs . . 27
9. Troubles ooting&Sensor Care . 28
Datalogger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Sensor Cleaning . . . . . . . . . . . . . . . . . . . . . . 28
Cleaning Method . . . . . . . . . . . . . . . . . . . . . . . . . .30
Declaration of Conformity . . . . . . .31
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 sensor’s features and
how to use this device successfully.
Specifications
Volumetric water content
Range:
Apparent dielectric permittivity (εa): 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 m3/m3(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 m3/m3(±3% VWC) typical
in mineral soils that have solution electrical conductiv-
ity < 10 dS/m
• Using medium specific calibration, ±0.01 - 0.02 m3/m3
(± 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
5TE Operator’s Manual
1. Introduction
2
Temperature
Range: -40-50 °C
Resolution: 0.1 °C
Accuracy: ±1 °C
General
Dimensions: 10 cm (1) x 3.2 cm (w) x 0.7 cm (d)
Prong Length: 5.2 cm
Dielectric Measurement Frequency: 70 MHz
Measurement Time: 150 ms (milliseconds)
Power requirements: 3.6 - 15 VDC, 0.3 mA quiescent, 10
mA during 150 ms measurement
Output: RS232 (TTL) or SDI-12
Operating Temperature: -40-50 °C
Connector types: 3.5 mm (stereo) plug or stripped &
tinned lead wires (Pigtail)
Cable Length: 5m standard; custom cable length available
upon request
Datalogger Compatibility (not exclusive):
Decagon: Em50, Em50R
Campbell Scientific: Any logger with serial I/O (CR10X,
CR850, 1000, 3000, etc.)
Contact Information
If you need to contact Decagon:
•Call us at 800-755-2751 or (509) 332-2756
•Fax us at (509) 332-5158
•E-mail us at [email protected].
Warranty Information
All Decagon products have a 30-day satisfaction guarantee
and a one-year warranty.
5TE Operator’s Manual
1. Introduction
3
Seller’s Liability
Seller warrants new equipment of its own manufacture
against defective workmanship and materials for a period of
one year from date of receipt of equipment (the results of
ordinary wear and tear, neglect, misuse, accident and exces-
sive deterioration due to corrosion from any cause are not to
be considered a defect); but Seller’s liability for defective
parts shall in no event exceed the furnishing of replacement
parts F.O.B. the factory where originally manufactured.
Material and equipment covered hereby which is not manu-
factured by Seller shall be covered only by the warranty of
its manufacturer. Seller shall not be liable to Buyer for loss,
damage or injuries to persons (including death), or to prop-
erty or things of whatsoever kind (including, but not without
limitation, loss of anticipated profits), occasioned by or aris-
ing out of the installation, operation, use, misuse, nonuse,
repair, or replacement of said material and equipment, or
out of the use of any method or process for which the same
may be employed. The use of this equipment constitutes
Buyer’s acceptance of the terms set forth in this warranty.
There are no understandings, representations, or warranties
of any kind, express, implied, statutory or otherwise
(including, but without limitation, the implied warranties of
merchantability and fitness for a particular purpose), not
expressly set forth herein.
5TE Operator’s Manual
2. About the 5TE
4
2. About t e 5TE
The 5TE is designed to measure the water content, electrical
conductivity, and temperature of soil and growing media.
Using an oscillator running at 70 MHz, it measures the
dielectric permittivity of soil to determine the water content.
A thermistor in thermal contact with the sensor prongs pro-
vides the soil temperature, while the screws on the surface
of the sensor form a two-sensor electrical array to measure
electrical conductivity.
Background Info
In 2006, Decagon incorporated research from its EC-5 volu-
metric water content sensor into the ECH2O-TE, a sensor
which measured volumetric water content, temperature, and
electrical conductivity. The new 5TE uses the same theory
as the ECH2O-TE, but the location of the EC measurement
is in the stainless steel screws instead of gold traces. The use
of stainless steel screws has made the 5TE a more robust
sensor. Additionally, the 5TE utilizes a 5 point dielectric
calibration to provide dielectric permittivity measurements
more accurate than the previous ECH2O-TE.
5TE Operator’s Manual
2. About the 5TE
5
Figure 1: 5TE Components
5TE Operator’s Manual
3.Theory
6
3.T eory
Volumetric Water Content
The 5TE sensor uses an electromagnetic field to measure
the dielectric permittivity of the surrounding medium. The
sensor supplies a 70 MHz oscillating wave to the sensor
prongs that charges according to the dielectric of the mate-
rial. The stored charge is proportional to soil dielectric and
soil volumetric water content. The 5TE microprocessor
measures the charge and outputs a value of dielectric per-
mittivity from the sensor.
Temperature
The 5TE uses a surface-mounted thermistor to take temper-
ature readings. It is located underneath the sensor overmold,
next to one of the prongs, and will read the temperature of
the prong surface. The 5TE will output temperature in °C
unless otherwise stated in your preferences file in either the
ECH2O DataTrac or ECH2O Utility programs.
It is important to note that if the black plastic overmold of
the sensor is in direct sunshine, the temperature measure-
ment may read high. Exposure of the overmold to solar radi-
ation will also drastically decrease the life expectancy of the
sensor. We do not recommend that the sensor be installed
with the overmold in the sun.
Electrical Conductivity
Electrical conductivity (EC) is the ability of a substance to
conduct electricity and can be used to infer the amount of
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