Decagon Devices 5TE Bedienungsanleitung

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

All ri hts reserved

5TE Operator’s Manual

Table of Contents

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

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

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:

0.1

(unitless) from 1-20, <0.75

(unitless) from 20-80

VWC: 0.0008 m3/m3(0.08% VWC) from 0 to 50% VWC

Accuracy:

(

): ±

(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

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

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

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

Figure 1: 5TE Components

5TE Operator’s Manual

3.Theory

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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