RXW TEROS-12 Soil Moisture EC Temp Sensor (RXW-T12-xxx) Manual
1-800-LOGGERS
3
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shows all symbols illuminated on the LCD screen followed by
definitions of each symbol in the table.
LCD Symbol Description
The battery indicator shows the approximate battery
charge remaining.
This is a signal strength indicator. The more bars, the
stronger the signal between motes. If there is no x
icon next to the signal strength indicator, then the
mote is part of a HOBOnet Wireless Sensor Network.
An empty signal strength icon plus the x icon
indicates that the mote is not currently part of a
network. See
Adding the Mote to the HOBOnet
Wireless Sensor Network
for details on how to add a
mote to the network.
When the mote is in the process of joining a
network, the signal strength icon will blink and then
the bars in the icon will cycle from left to right. The x
icon will blink during the last step in the network
registration process (see
Adding the Mote to the
HOBOnet Wireless Sensor
Network for details).
This indicates a problem with the sensor itself (the
mote is operational). Check the sensor and make any
adjustments to it as needed. Contact Onset
Technical Support if the problem persists.
Sensor Components and Operation
The sensor measures soil moisture, temperature, and EC of soil
using stainless steel needles. As shown in the following
diagram, the sensor measures soil moisture between Needle 1
and Needle 2 and measures EC between Needle 2 and Needle
3. Temperature is measured with an embedded thermistor.
A ferrite core positioned on the sensor cable 7.6 cm (3
inches) away from the sensor head is used to isolate the
sensor from any interferences in the system. This
mitigates any potential noise from the system on the
measured sensor data.
Important:
Do not attach anything to the section of the
cable between the sensor head and the ferrite core as
this may influence the measurements.
The VWC measurement sensitivity is contained within a 1,010
mL volume roughly depicted in the following VFW volume of
influence figure.
Adding the Mote to the HOBOnet Wireless
Sensor Network
The mote must join a HOBOnet Wireless Sensor Network
before it can begin measuring soil moisture and transmitting
data. This requires accessing the station and the mote at the
same time so it is recommended that you complete these steps
before deploying the mote.
Important:
If you are setting up a new station, follow the
instructions in the station quick start before setting up this
mote (go to www.onsetcomp.com/support/manuals/24380-
man-rx2105-rx2106-qsg for RX2105 and RX2106 stations or go
to www.onsetcomp.com/support/manuals/18254-MAN-QSG-
RX3000 for RX3000 stations).
To add a mote to the network:
1.
If the LCD is blank on the station, press any button to wake
it up.
2.
Press the Select button once (which shows the number of
smart sensors installed) and then press it again to switch to
the module with the manager (module 2 on RX2105 or
RX2106 stations).
Press this button to view the module
Needle 3
Needle 2
Needle 1
Ferrite core
Thermistor in Needle 2
EC
VWC
WARNING:
Risk of
personal injury is
present. Sensor needle
points are extremely
sharp and will puncture
skin. Handle with care.
9.3 cm
7.5 cm