METER GROUP 10HS Manuale utente

10HS

TABLE OF CONTENTS

1. Introduction..............................................................................................1

2. Operation ...................................................................................................2

2.1 Installation ................................................................................................2

2.2 Removing the Sensor .................................................................................3

2.3 Connecting................................................................................................. 3

2.3.1 Connect to METER Data Logger........................................................ 4

2.3.2 Connect to a Non-METER Data Logger ............................................. 4

2.4 Interfacing with Data Loggers....................................................................6

2.4.1 Data Logger Requirements...............................................................6

2.4.2 METER Data Loggers........................................................................6

2.4.3 Non-METER Data Loggers................................................................ 6

3. System.........................................................................................................7

3.1 Specifications............................................................................................7

3.2 About 10HS................................................................................................ 9

4. Service....................................................................................................... 10

4.1 Calibration ............................................................................................... 10

4.1.1 Dielectric Calibration..................................................................... 10

4.1.2 Mineral Soil Calibration ................................................................. 10

4.1.3 Potting Soil .................................................................................... 11

4.2 Troubleshooting....................................................................................... 12

4.3 Customer Support.................................................................................... 13

4.4 Terms and Conditions .............................................................................. 13

References .................................................................................................... 14

Index ................................................................................................................. 15

13508-05

5.9.2018

1. INTRODUCTION

Thank you for choosing the ECH2O 10HS Soil Water Content sensor from METER Group.

This innovative sensor enables volumetric water content monitoring of soil accurately and

affordably.

This manual guides the customer through the sensor features and describes how to use the

sensor successfully. METER hopes the contents of this manual are useful in understanding

the instrument and maximizing its benefit.

Prior to use, verify the 10HS arrived in good condition.

OPERATION

2. OPERATION

Please read all instructions before operating the 10HS to ensure it performs to its full

potential.

PRECAUTIONS

METER sensors are built to the highest standards, but misuse, improper protection, or

improper installation may damage the sensor and possibly void the manufacturer’s warranty.

Before integrating 10HS into a system, follow the recommended installation instructions and

have the proper protections in place to safeguard sensors from damage.

2.1 INSTALLATION

When selecting a site for installation, remember that the soil adjacent to the sensor surface

has the strongest influence on the sensor reading and that the sensor measures the

volumetric water content of the soil. Therefore any air gaps or excessive soil compaction

around the sensor and in between the sensor prongs can profoundly influence the readings.

• If installing sensors in a lightning-prone area with a grounded data logger, please read

Lightning surge and grounding practices.

• Test the sensors with the data logging device and software before going to the field.

Do not install the sensor adjacent to large metal objects such as metal poles or stakes. This

can attenuate the sensor's electromagnetic field and adversely affect readings. In addition,

the 10HS sensor should not be installed within 5 cm of the soil surface, or the sensing

volume of the electromagnetic field can extend out of the soil and reduce accuracy.

Because the 10HS has gaps between its prongs, it is also important to consider the particle

size of the medium. It is possible to get sticks, bark, roots or other material stuck between

the sensor prongs, which will adversely affect readings. Finally, be careful when inserting the

sensors into dense soil, as the prongs can break if excessive sideways force is used when

pushing them in.

When installing the 10HS, it is imperative to maximize contact between the sensor and soil.

For most accurate results, the sensor should be inserted into undisturbed soil. There are two

basic methods to accomplish a high-quality installation.

With either of these methods, the sensor may still be difficult to insert into extremely

compact or dry soil.

NOTE: Never pound the sensor into the soil! If there is difficulty inserting the sensor, loosen or wet the soil.This will

result in inaccurate VWC measurements until the water added during installing redistributes into the surrounding soil.

10HS

METHOD 1. HORIZONTAL INSTALLATION

1. Excavate a hole or trench a few centimeters deeper than the depth at which the sensor

is to be installed.

2. At the installation depth, shave off some soil from the vertical soil face exposing

undisturbed soil.

3. Insert the sensor into the undisturbed soil face until the entire sensing portion of the

10HS is inserted. The tip of each prong has been sharpened to make it easier to push the

sensor into the soil. Be careful with the sharp tips!

4. Backﬁll the trench taking care to pack the soil back to natural bulk density around the

sensor body of the 10HS.

METHOD 2. VERTICAL INSTALLATION

1. Auger a 4-in hole to the depth at which the sensor is to be installed.

2. Insert the sensor into the undisturbed soil at the bottom of the auger hole using a hand

or any other implement that will guide the sensor into the soil at the bottom of the hole.

Many people have used a simple piece of PVC pipe with a notch cut in the end for the

sensor to sit in, with the sensor cable routed inside the pipe.

3. After inserting the sensor, remove the installation device and backﬁll the hole taking

care to pack the soil back to natural bulk density while not damaging the black

overmolding of the sensor and the sensor cable in the process.

View a visual demonstration on proper installation of the sensor in How to install soil

moisture sensors.

The sensor can be oriented in any direction. However, orienting the flat side perpendicular

to the surface of the soil will minimize effects on downward water movement. The sensor

measures the average VWC along its length, so a vertical installation will integrate VWC over

a 10-cm depth wile a horizontal orientation will measure VWC at a more discrete depth.

2.2 REMOVING THE SENSOR

When removing the sensor from the soil, do not pull it out of the soil by the cable! Doing so

may break internal connections and make the sensor unusable.

2.3 CONNECTING

The 10HS works most efficiently with METER ZENTRA, EM60, or Em50 data loggers, and

it can also be used with other data loggers, such as those from Campbell Scientific, Inc.

(Section2.4).

10HS sensors require an excitation voltage in the range of 3 to 15 VDC.

OPERATION

The 10HS sensors come with a 3.5-mm stereo plug connector (Figure1) to facilitate easy

connection with METER loggers. 10HS sensors may be ordered with stripped and tinned

wires to facilitate connecting to some third-party loggers (Section2.3.2).

Ground

Data

Power

Figure1 Stereo plug connector

The 10HS sensor comes standard with a 5-m cable. It may be purchased with custom cable

lengths for an additional fee (on a per-meter basis). This option eliminates the need for splicing

the cable (a possible failure point). However, the maximum recommended length is 40 m.

2.3.1 CONNECT TO METER DATA LOGGER

The 10HS sensor works seamlessly with METER ZENTRA, EM60, or Em50 data loggers.

Check the METER download webpage for the most recent data logger firmware. Logger

configuration may be done using either ZENTRA Utility (desktop and mobile application) or

ZENTRA Cloud (web-based application for cell-enabled ZENTRA data loggers) (Section2.4.2).

1. Plug the 3.5-mm stereo plug connector into one of the sensor ports on the logger.

2. Using the appropriate software application, conﬁgure the chosen logger port for 10HS.

3. Set the measurement interval.

2.3.2 CONNECT TO A NONMETER DATA LOGGER

The 10HS sensor can be used with non-METER (third-party) data loggers. Refer to the third-

party logger manual for details on logger communications, power supply, and ground ports.

10HS sensors can be ordered with stripped and tinned (pigtail) connecting wires for use with

screw terminals. Connect the 10HS wires to the data logger as illustrated in Figure2 and

Figure3,with the power supply wire (brown) connected to the excitation, the analog out wire

(orange) to a analog input, and the bare ground wire to ground.

Ground (bare)

Data (orange)

Power (brown)

Figure2 Pigtail wiring

NOTE: Some 10HS sensors may have the older Decagon wiring scheme where the power supply is white, the analog

out is red, and the bare wire is ground.

10HS

Exc. H

Analog In

Data Logger

Analog

Out Ground

Power

Supply

Figure3 Wiring diagram

NOTE: The acceptable range of excitation voltages is from 3 to 15 VDC.To read 10HS sensors with Campbell Scientific

data loggers, power the sensor from a switched 12-V port or a 12-V port if using a multiplexer.

If the 10HS cable has a standard 3.5-mm stereo plug connector and will be connected to a

non-METER data logger, please use one of the following two options.

Option 1

1. Clip off the 3.5-mm stereo plug connector on the sensor cable.

2. Strip and tin the wires.

3. Wire it directly into the data logger.

This option has the advantage of creating a direct connection with no chance of the sensor

becoming unplugged. However, it then cannot be easily used in the future with a METER

readout unit or data logger.

Option 2

Obtain an adapter cable from METER.

The adapter cable has a connector for the stereo plug connector on one end and three

wires (or pigtail adapter) for connection to a data logger on the other end. The stripped and

tinned adapter cable wires have the same termination as seen in Figure3: the brown wire is

excitation, the orange is output, and the bare wire is ground.

NOTE: Secure the stereo plug connector to the pigtail adapter connections to ensure the sensor does not become

disconnected during use.

OPERATION

2.4 INTERFACING WITH DATA LOGGERS

2.4.1 DATA LOGGER REQUIREMENTS

The 10HS sensor is designed to work most efficiently with METER data loggers. All METER

readout devices use a 3.0-VDC excitation.

The sensors, however, may be adapted for use with other data loggers, such as those from

Campbell Scientific, Inc., for example. The 10HS requires an excitation voltage in the range of

3 to 15 VDC. The sensors produce an output voltage that depends on the dielectric constant

of the medium surrounding the sensor, and ranges between 10% and 50% of the excitation

voltage. Any data logger which can produce a 3- to 15-VDC excitation with approximately

10-ms duration and read a volt level signal with 12-bit or better resolution should be

compatible with the 10HS sensor. The current requirement for the 10HS is 12 mA at 3 VDC.

METER designed the 10HS sensor for use with data loggers and readout devices that

provide short excitation pulses, leaving the sensors turned OFF most of the time. Continuous

excitation not only wastes battery power, but may, under certain circumstances, cause

the sensor to exceed government specified limits on electromagnetic emissions. Do not

continuously power the 10HS sensor.

2.4.2 METER DATA LOGGERS

METER data loggers can be configured using ZENTRA Utility (a desktop and mobile

application) or ZENTRA Cloud (a web-based application for cellular-enabled ZENTRA data

loggers). Contact Customer Support for more information about these programs.

2.4.3 NONMETER DATA LOGGERS

Non-METER data loggers may require programming to read the 10HS sensor. METER

provides some resources to help interface with Campbell Scientific loggers.

The Campbell Scientific SCWin (Short Cut) program for the 10HS soil moisture sensor is

available.

10HS

3. SYSTEM

This section describes the 10HS sensor.

3.1 SPECIFICATIONS

MEASUREMENT SPECIFICATIONS

Volumetric Water Content (VWC)

Range 0−0.57 m3/m3(0%−57% VWC)

Resolution 0.0008 m³/m³ (0.08% VWC) in mineral soils from 0−0.50 m³/m³

(0%−50% VWC)

Accuracy With standard calibration equation, 0.03 m³/m³ (3% VWC) typical

in mineral soils that have solution electrical conductivity <10dS/m

NOTE: With soil-specific calibration, ±0.02 m³/m³ ( ±2% VWC) is typical in any soil.

COMMUNICATION SPECIFICATIONS

Output

300−1,250 mV, independent of excitation voltage

Data Logger Compatibility

Data aquisition systems capable of switched 3–15 VDC excitation and single-ended

voltage measurement at greater than or equal to 12-bit resolution.

Indice

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