RXW Temperature Sensor (RXW-TMB-1-xxx and RXW-TMB-6-xxx) Manual
•
Make sure the mote is mounted a minimum of 1.8 m (6 ft)
from the ground to help maximize distance and signal
strength.
•
Place the mote so there is full line of sight with the next
mote. If there is an obstruction between two sensor
motes or between the sensor mote and the manager, then
use a repeater mounted on the obstruction.
•
There should not be more than five motes in any direction
at their maximum transmission range from the manager.
Data logged by a wireless sensor must travel or “hop”
across the wireless network from one mote to the next
until it ultimately reaches the manager connected to the
station. To make sure the data can successfully travel
across the network, the mote should not be more than
five hops away from the manager.
•
The HOBOnet Wireless Sensor Network can support up to
50 wireless sensors or 336 data channels per one HOBO
RX station.
•
Use a #4-40 screw to attach a ground wire to the port on
the back of the mote if you are deploying the mote in a
location where lightning is a concern.
Sensor Mounting Guidelines
•
Mount the sensor so that at least 10 cm (4 inches) of the
sensor cable is placed in the medium that is being
measured. The temperature sensor is approximately 0.32
cm (0.126 inches) from the end of the stainless steel tip.
•
To minimize measurement errors due to ambient RF, keep
the probe cable as far as possible from other cables.
•
Refer to the station manual and Tripod Setup Guide at
information regarding setting up stations.
Sensor Operating Environment
The temperature sensor can be used in air, soil, or water. The
sensor is designed to last at least one year in water as warm as
50°C (122°F). If the sensor is continually exposed to water for
more than a year, it will eventually drift. Exposure to water
above 50°C (122°F) is not recommended and may significantly
reduce the life of the sensor.
Maintenance
The temperature sensor does not require any maintenance
other than an occasional cleaning. If necessary, rinse the sensor
and cable with mild soap and fresh water.
Periodically inspect the mote and do the following:
•
Verify the mote is free of visible damage or cracks.
•
Make sure the mote is clean. Wipe off any dust or grime
with a damp cloth.
•
Wipe off any water before opening the mote.
•
Make sure the interior seal is intact and the latches are
fully locked when the mote door is closed.
Verifying Sensor Accuracy
It is recommended that you check the accuracy of the
temperature sensor annually. The temperature sensor cannot
be calibrated. Onset uses precision components to obtain
accurate measurements. If the sensor is not providing accurate
data, then it may be damaged or worn out if it has been in use
for several years.
Updating Mote Firmware
If a new firmware version is available for the mote, use
HOBOlink to download the file to your computer.
1.
In HOBOlink, go to Devices, then RX Devices, and click your
station name.
2.
On the station page, click Overview and scroll down to
Device Information.
3.
Click the Wireless tab. This icon
appears next to the
mote if there is a new version of firmware available.
4.
Click the firmware
upgrade link. Click Download and
save the firmware .bin file to your computer.
5.
Connect the mote to the computer with a USB cable (open
the mote door and use the USB port to the right of the
LCD). The blue LED is illuminated while connected.
6.
The mote appears as a new storage device in the
computer’s file storage manager. Copy the downloaded
firmware file to the new storage device (the mote). The
blue LED will blink slowly while the file is copying.
7.
After the file is copied to the mote, the LED will stop
blinking and remain a steady blue. Eject the storage device
from the computer and disconnect the cable from the
mote. The firmware installation process will begin
automatically on the mote. The blue LED will blink rapidly
while the firmware is installed. Once the firmware
installation is complete, the LCD symbols return and the
mote will automatically rejoin the network.
Notes:
•
Mac® users: A message may appear indicating the disk
has not ejected properly when disconnecting the mote
from the computer. The mote is operational and you can
ignore the message.
•
If the blue LED turns off abruptly while copying the file or
installing the firmware, a problem has occurred. Contact
Onset Technical Support for help.
Battery Information
The mote uses two 1.5 V lithium batteries (HWSB-LI). Lithium
battery life is an estimated at 1 year, but varies based on the
ambient temperature where the mote is deployed, the logging
interval, the number of tripped alarms, and other factors.
Estimates are not guaranteed due to uncertainties in initial
battery conditions and operating environment.
To install lithium batteries:
1.
Open the mote door.
2.
Remove any old batteries and install the new ones
observing polarity.
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