METER TEROS 10 Manuale utente
TEROS 10
i
TABLE OF CONTENTS
1. Introduction..............................................................................................1
2. Operation ...................................................................................................2
2.1 Installation.................................................................................................2
2.2 Connecting.................................................................................................7
2.2.1 Connect to METER Data Logger.........................................................7
2.2.2 Connect to a Non-METER Logger ......................................................8
2.3 Interfacing With Data Loggers ....................................................................9
3. System....................................................................................................... 10
3.1 Specifications ..........................................................................................10
3.2 Components.............................................................................................12
3.3 Theory ......................................................................................................13
4. Service....................................................................................................... 14
4.1 Calibrations..............................................................................................14
4.1.1 Mineral Soils ...................................................................................14
4.1.2 Soilless Media.................................................................................14
4.1.3 Apparent Dielectric Permittivity......................................................15
4.2 Troubleshooting........................................................................................15
4.3 Customer Support....................................................................................16
4.4 Terms and Conditions...............................................................................16
Reference....................................................................................................... 17
Index ................................................................................................................. 18
18241-00
6.30.2018
ii
1
TEROS 10
1. INTRODUCTION
Thank you for choosing the TEROS 10 Rugged Soil Moisture sensor.
The TEROS10 sensor is designed to be installed in mineral soils, many types of growing
media, and other porous materials.
This manual guides the customer through the sensor features and applicationsand describes
how to use the sensor successfully.
• Volumetric water content (VWC) measurement
• Soil/substrate water balance
• Irrigation management
Prior to use, verify the TEROS10 arrived in good condition. METER recommends testing the
sensors with the data logging device and software before going to the field.
2
OPERATION
2. OPERATION
Please read all instructions before operating the TEROS10 to ensure it performs to its full
potential.
PRECAUTIONS
METER sensors are built to the highest standards. Misuse, improper protection, or improper
installation may damage the sensor and possibly void the manufacturer’s warranty. Before
integrating the TEROS10 into a system, follow the recommended installation instructions
and have the proper protections in place to safeguard sensors from damage. If installing
sensors in a lightning-prone area with a grounded data logger, see the application note
Lightning surge and grounding practices.
2.1 INSTALLATION
Follow the steps listed in Table 1 to set up the TEROS10 and start collecting data. For more
detailed installation information consult the TEROS Sensors Best Practices Installation Guide.
Table 1 Installation
Tools Needed
Auger or Shovel
Optional Tool
Borehole Installation Tool
flashlight
carriage
lever
base plate
jack
shaft
actuator
cradle
TEROS
sensor
3
TEROS 10
Table 1 Installation (continued)
Preparing
Determine Best Installation Method
There are several methods for installing soil moisture sensors. These methods
are described in Table 2.
Avoid Putting Any Metal in Between the Sensor and the Ferrite Core
Any metal located between the sensor and the ferrite core can interfere with
the TEROS10 VWC measurement.
Check Sensor Functionality
Plug the sensor into the data logger (Section2.2) to make sure the sensor is
operating as expected.
NOTE:
ZENTRA Utility.
Conduct System Check
Verify all sensors read within expected ranges. To validate both sensor
function and logger functionality, take a sensor measurement in air and
water. The TEROS10 will read approximately 0.64 m3/m3 in water (sensor
head fully submerged to 1 cm up cable) and a slightly negative value in air.
1 cm
Installing
Create Hole
Avoid interfering objects. Large metal objects can affect the sensor function
and distort readings. Roots or rocks that could potentially bend the needles
and should be avoided.
Auger or trench a hole to the desired sensor installation depth and direction
according to the installation method desired.
Insert Sensor
ATTENTION: Minimize air gaps around the sensor. Air gaps around the sensor needles will
result in low readings of soil moisture.
1. Load the TEROS10 using the Borehole Installation Tool (BIT).
NOTE: The BIT provides a significant amount of mechanical advantage. See
2. Lower the tool into the hole or trench with the back of the tool supported
by the far wall.
3. Pull the tool lever to activate the jack and insert the sensor into the
sidewall.
WARNING: When installing sensors in rocky soils,use care to avoid bending sensor needles.
The soil closest to the sensor has the strongest inuence on readings. It is ideal
to install the sensor in the native soil to get accurate soil moisture readings.
4
OPERATION
Table 1 Installation (continued)
Installing
(continued)
TEROS10 may be positioned in any direction (needles aligned horizontally
or vertically). However, installing the sensors with the needles in a horizontal
position (as shown below) will provide the least restriction to water ow
through soil because the water will ow through the soil directly to the
needles.
Sensor body vertical and needles horizontal
Because of the shape of the sensor electromagnetic eld, installing the
sensor with the body oriented vertically will integrate more soil depth into
the soil moisture measurement. Installing the sensor with the body oriented
horizontally (on its side) will provide measurements at a more discreet depth.
See Measurement volume of METER volumetric water content sensors for
more information on sensor measurement volume.
Connecting
Select Location for Data Logger and Cable
Connect to Data Logger
Plug the sensor into the data logger.
Use the data logger to make sure the sensor is reading properly.
Verify that these readings are within expected ranges.
Secure and Protect Cables
NOTE: Improperly protected cables can lead to severed cables or disconnected sensors.
Cabling issues can be caused by many factors such as rodent damage, driving over sensor
cables, tripping over cables, not leaving enough cable slack during installation, or poor
sensor wiring connections.
5
TEROS 10
Table 1 Installation (continued)
Connecting
(continued)
Install cables in conduit or plastic cladding when near the ground to avoid
rodent damage.
Relieve strain on the connections and prevent loose cabling from being
inadvertently snagged by gathering and securing the cables between the
TEROS10 and the data acquisition device to the mounting mast in one or more
places.
Tie excess vertical cable to the data logger mast to ensure cable weight does
not cause sensor to unplug.
conduit
zip tie
mast
ERROR
OK
TEST
(–)
(+)
(–)
(+)
(–)
(+)
(+)
(–)
(+)
(–)
P1 P2 P3 P4 P5 P6
Securing excess cable
Return soil to the hole, packing the soil back to its native bulk density.
WARNING: Do not hit the ferrite core as this could potentially pull the sensor out of the soil.
Table 2 contains brief descriptions for typical installation methods. Each has its own
advantages and disadvantages. For more information about which installation method is
best for specific applications, please see the TEROS Sensors Best Practices Installation
Guide or contact Customer Support.
6
OPERATION
Table 2 Installation methods
Borehole
This method uses the TEROS
Borehole Installation Tool
(Table1) that allows a prole
of soil moisture sensors to be
installed at different depths
within a single augered borehole.
A 10-cm (4-in) borehole is
augered vertically at the
measurement location. The
Borehole Installation Tool is then
used to install the sensors in the
sidewall of the borehole.
NOTE: The borehole method
Advantage
Minimizes soil
disturbance at
measurement
site.
Disadvantage
Requires a
specialized
installation
tool that can
be rented from
METER.
Trench
This method is best for shallow
installations (less than 40 cm).
This requires digging a trench
with a shovel, excavator, etc. The
trench needs to be dug to the
depth of the deepest installed
sensor. For deep installations, this
may require a large trench.
The sensor is installed carefully
by hand into the undisturbed soil
of the trench sidewall. The trench
is then carefully backlled to
preserve the bulk density of the
soil and to avoid dislodging the
installed sensor by accidentally
snagging the ferrite core.
Advantage
Does not
require
specialized
equipment.
Disadvantage
Large soil
disturbance at
measurement
site.
Potentially
large
excavation
effort.
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