Geokon GeoNet 8000 Series Instruction Manual

Installing Model 8920
Cellular Loggers

GEOKON Provided
►Mini to standard USB cable
►#3 Philips head screwdriver
►Small flat head screwdriver
►Desiccant packs
Customer Provided
►Mounting hardware
►Materials to create a suitable earth ground
Items Required for Installation

1. Remove the rubber cap from
the antenna mount
2. Thread the antenna onto the
mount by rotating it clockwise
until finger tight
Attach the Antenna
Do not cross thread the antenna.
The O-ring on the antenna must
be flush against the enclosure.

A
C D
B
Cellular Loggers can be mounted
using bolts (A), screws (B),
hose clamps (C), U-bolts (D), etc.
(Mounting hardware not included)
Always mount Loggers vertically,
with the antenna pointing up
The space around the antenna
should be free of obstructions
A minimum mounting height of
two meters (six-feet) is
recommended
Logger Mounting

The direction of tilt for the A and
B axes is shown on the cover of
the unit
The two axes of the tiltmeter
have a calibrated range of ±30°,
based on a starting position of 0°
(antenna pointing up)
Tiltmeter Logger Orientation

Properly grounding Loggers
protects against lightning and
other large transient voltages
A 6-foot copper rod and 12
AWG or larger copper wire
are recommended
All Cellular Loggers can be
grounded via the mounting
bracket (A)
Multi-channel Loggers can
also be grounded via the
copper ground lug on the
bottom of the enclosure (B)
Grounding the Logger
A B

1. Using a Phillips head screwdriver,
loosen the cover screws by turning
them counterclockwise
2. Remove the cover
Remove the Cover

1. Record the serial number of the
sensor and the logger
(For Multi-channel loggers, note
the channel each sensor has
been wired into)
2. Loosen the cable gland nut and
remove white plastic dowel
3. Slide the cable of the sensor
through the cable gland (and
gland nut) and into the Logger
Connecting the Sensor

4. Wire each conductor by
pressing down on an orange
tab, inserting the bare end of
the conductor into the terminal
block, then releasing the tab
Conductors are wired as
follows:
Connect the Sensor (Continued)
Addressable Loggers
GREEN = 485–
RED = 12V
BLACK = GND
VW Loggers
RED =
BLACK = VW–
GREEN = TH–

5. Gently pull on each conductor to make sure it is secure
6. Tighten the nut onto the cable gland until the gland firmly grips
the outer jacket of the cable
The cable gland must be properly tightened to prevent water
entry (Do not over-tighten, which may strip the plastic threads)
7. Gently pull on the sensor cable to make sure it is held in place
by the cable gland
Connect the Sensor (Continued)
To prevent possible short circuits, do not allow bare leads to
touch each other during or after wiring

On Multi-channel loggers, sensor cables should be inserted
into the cable glands in order from left to right and wired in
sequence, starting with Channel 1
Do not wire sensors into the terminal blocks marked
“485_IN” and “485_OUT” on a Multi-channel logger
Multi-channel and addressable loggers stop trying to read
empty channels after two attempts; additional attempts
occur at the top of every hour
(Reset the logger to initiate an immediate retry)
Multi-Channel and Addressable
Loggers

1. Plug the AC adaptor, solar
panel, or other external
power source, into the 9-24V
power jack
2. Move the power switch to
the correct position based on
the table below
Powering the Loggers
Geographical Zone
Power Source Temperate Sub Polar
Mains / Solar with External Battery INT
BATTERY
EXT BATTERY
Solar, NO External Battery N/A

Press the Status button to display
the logger status
The table below shows the
meaning of the LED indications
If the red LED flashes, wait a few
minutes then try again
(If communication cannot be
established, refer to the manual
for troubleshooting)
Verify Connectivity
‘Logging’ LED ‘Comms’ LED Indication
GREEN Logging, Good Communications
GREEN RED Logging, No Communications
RED Not Logging, No Communications

1. Place the supplied desiccant packs
inside the enclosure
2. Make sure the cover gasket and the
mating ridge on the enclosure are
clean, and that the gasket is
properly seated inside the groove
3. Place the cover on the unit, making
sure the orientation is correct
4. Tighten the cover screws a little at a
time, working in a diagonal pattern
5. Check that the cover has closed
tightly and evenly
Close the Logger

Complete the installation before commissioning the Logger
Loggers are commissioned using the GEOKON API portal:
https://api.geokon.com
A tutorial on using the API portal is available at:
https://www.geokon.com/8900-Tutorials#API
Logger Commissioning

Consult the Model 8920 instruction manual
Instruction manuals are available for download at:
www.geokon.com/Manuals
Please visit https://www.geokon.com/Tutorials for more tutorials
For more information…
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