Geokon GK-604D User manual

MODEL GK-604D DIGITAL INCLINOMETER SYSTEM | QUICK START GUIDE |
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Document Revision: D | Release Date: 8/1/22
Model GK-604D
Digital Inclinometer System
Quick Start Guide
1. INTRODUCTION
The GK-604D Digital Inclinometer System is made up of four components: An
Inclinometer Probe, the Readout Unit, the Remote Module, and a Pulley
Assembly (Figure 1).
Figure 1: Model GK-604D Digital Inclinometer System
GEOKON makes every effort to ensure that the GK-604D system is completely set
up and working before it leaves the factory. If using an Android device that was
not provided by GEOKON as the readout unit, refer to the GK-604D instruction
manuals for information on how to install the GK-604D Reader Application and
pair the device with the Remote Module.
For more detailed information than is provided in this Quick Start Guide, please
refer to the Model GK-604D Instruction Manuals.
2. STARTING THE GK-604D READER APP THE FIRST
TIME
Begin by powering on the readout unit. The GK-604D readout
software is launched by entering the Android Apps drawer and then
selecting the GK-604D Reader icon (shown right).
When starting the application for the first time, the user will be prompted to
grant certain permissions. Tap “ALLOW” to grant the permissions and open the
application. (Tapping “DENY” will cause the application to close.)
After file access permission is granted, the Main Screen is shown (Figure 2).

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Figure 2: Main Screen
The GK-604D Reader Main Screen contains several “Button” and menu controls
designed to make it easy to select features of the application. These controls are
described in brief below.
The “Holes” button causes the “Holes” screen to be displayed.
This screen allows holes to be created, selected, and edited. The
process of creating a new hole is covered in Section 2.1.
The “Begin Survey” button is used to connect the Remote Module
to the Readout Unit (Section 2.2) and conduct a survey (Section 3).
Tapping the “Plots/Reports” button displays the “Plots/Reports”
selection screen. See Section 4.
Tap the “Share Data” button to export survey data to a file or
share it via email. See Section 5.
The “Status” pane of the Main Screen displays
the currently selected elements of the Reader
application, including the Project, Hole, and
Inclinometer Probe. The project can be
changed by tapping the project name. The user
will then be prompted to select a different hole.
Additional functions are available from the Main Screen “kebab” menu. These
items are described in the GK-604D Reader Application manual.
2.1 CREATING A NEW “HOLE”
“Holes” are contained within “Projects”. A default project is
created automatically when the app is first launched. Since
most boreholes are unique, no default “Hole” is created. To
create a new Hole, tap the Holes button on the Main Screen to
open the Holes” screen (Figure 3).

MODEL GK-604D DIGITAL INCLINOMETER SYSTEM | QUICK START GUIDE |
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Figure 3: Holes Screen
Tap the icon to open the Hole Editor screen (Figure 4). Enter a Name, Units,
Starting Level, and Interval then tap the back button to save the Hole (Figure 5).
Tap the back button again to return to the Main Screen.
Figure 5 Holes Screen (with new
“Hole 1” shown)
2.2 CONNECTING TO THE REMOTE MODULE
Press the “Power On/Off” button on the Remote Module (cable
reel). The blue light on the Remote Module will begin to blink.
Next, tap the “Begin Survey” button on the Main Screen to
initiate the Remote Module connection process.
Figure 4: Hole Editor Screen

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After a successful connection, the blue light on the Remote Module will remain
lit and the “Live Readings” screen (Figure 6) will be displayed on the Readout
Unit.
Figure 6: Problem Connecting
2.3 ENABLE COMPASS SURVEY
All GEOKON Inclinometer probes manufactured after 2015 have a built-in
compass. The compass sensor, coupled with two axes of MEMS, allows a
compass survey of the selected hole to be performed at the same time as the
inclinometer survey. For optimum accuracy, the digital inclinometer/compass
probe should be calibrated for each survey site.
To access the compass calibration screen, tap the “kebab” menu button in the
upper right corner of the Live Readings screen, then select “Calibrate
Compass”. Follow the onscreen instructions to calibrate the compass. (Make
sure to hold the probe in an upright position during the calibration.)
After completing the calibration, the Live Readings Screen will be displayed. Tap
the “kebab” menu button and then select "Enable Compass Survey". With the
compass enabled; an inclinometer survey will take approximately 30% longer
and:
•A+ data is always in degrees.
•and B- are always zero (0)
•B+ data is always 90 degrees greater than A+
Note: The compass is very sensitive to nearby ferrous metals. Any section of
the well that contains a metal casing will not yield accurate compass headings.
3. CONDUCTING A SURVEY
The following is a synopsis of the steps involved in taking a survey of the
inclinometer casing:
1. Use a clean working surface. If necessary, create a clean surface by placing a
tarp around the top of the inclinometer casing. This reduces potential for
debris to be collected on the inclinometer equipment and transmitted into
the casing.
2. Attach the cable to the probe making sure that the connector is clean and
the O-ring undamaged. Replace the O-ring if damaged. Tighten the
connector hand-tight to ensure that the O-ring is compressed and
watertight.

MODEL GK-604D DIGITAL INCLINOMETER SYSTEM | QUICK START GUIDE |
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3. Attach the pulley assembly to the top of the casing. If using a casing
extension, attach the pulley assembly to the top of the extension. Use of the
pulley assembly is highly recommended, as it reduces fatigue on the user
during monitoring and it helps provide repeatable and consistent placement
of the probe at each reading interval, which improves measurement
accuracy.
4. Align the probe so that the uppermost wheel fits into the casing groove that
faces the direction of the anticipated movement (in the case of a slope this
would be downhill, or, in the case of a shoring wall, in the direction of the
excavation.
5. Remove the wheel from the pulley assembly. Compress the probe’s wheel
assemblies as the probe is introduced into the casing and lower the
inclinometer probe into the casing. Slowly lower the probe and cable down
through the casing, exercising care not to let the probe strike against the
bottom of the hole to reduce the potential for damage to the probe.
6. Place the wheel into the pulley assembly and lift the inclinometer until the
first cable marker sits in the groove located in the metal plate on top of the
pulley assembly (or sits in the cable hold if a cable hold is being used). Allow
for at least 6 inches of clearance from the bottom of the probe to the bottom
of the casing. If using telescoping sections in the casing, allow for an
additional 6 inches of clearance for each telescoping section installed.
7. Allow the probe to rest in this position for about 10 minutes. This allows the
electronics in the probe to acclimate to the temperature in the casing and
will reduce the potential for bias-shift errors caused by thermal differences in
the probe between the first and second pass.
8. During this 10-minute period, switch on the FPC-3 and then launch the GK-
604D Reader | aos application. Follow the instructions for setting up a new
“hole” casing as indicated in Section 2.1. For new casings, take note of the
starting depth indicated on the cable (typically where the cable is supported)
and the reading intervals (half-meter / two foot). End depth is zero by default.
9. If an existing “hole” casing has been previously saved in the GK-604D
Reader | aos database, select it from the app in the “Holes” page. After the
10-minute “soak” period has expired, turn on the Remote Module (blue light
blinking) and tap on the Begin Survey menu, then press “OK” at the prompt
to display the Live Readings Page.
Make sure “Dataset 1” is shown in the upper right portion of the screen. If
"Dataset 2".is displayed, tap the Dataset button to select "Dataset 1".
10. Take the first reading by tapping the “RECORD” button then pull up on the
cable until the next cable marker sits in the groove located in the metal plate
on top of the pulley assembly (or sits in the cable hold if a cable hold is being
used). After the readings have stabilized, take another reading.
As the cable is being pulled up and out of the casing, place it on the tarp (or
clean surface) to the side of the borehole. The cable should be collected in a
figure eight-shaped arrangement on the ground (or tarp). This process will
reduce the potential for damage to the cable. Do not wind the cable back
onto the reel during this process, as repeated and continued winding of this
cable in the same direction will cause the cable to spiral and lead to kinking
or damage to the internal leads of the cable.
11. Continue in this way until the top marker is reached, then remove the wheel
from the pulley assembly, and pull the inclinometer probe out of thehole.
12. Rotate the probe 180 degrees, so that the uppermost wheel is aligned with the
grooves of the A- direction (opposite of the first pass). Carefully lower it to the
bottom of the hole, and then pull the cable up to the first reading depth.

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13. Allow for a few minutes (up to 5 minutes) for the probe to stabilize. The
probe should be mostly acclimated to the temperature in the casing, unless
the probe was out of the casing for an extended period following the first
pass. Tap the Dataset button to select "Dataset 2".
14. Repeat steps 10 through 12.
15. Tap the back button to exit the Live Readings Page. A prompt will be displayed
asking if the user would like to save the data. Tapping “Yes” will cause the reel
to shut down and the main page to be displayed on the GK-604D Reader |
aos app.
16. Disconnect the probe from the signal cable, wiping any moisture from both,
then attach protective caps to the probe and the cable. Collect the pile of
inclinometer cable and flip it over on the tarp. Retract the cable back onto the
reel. If the cable is difficult to manage and get back on the reel without
causing kinked sections, it is suggested to lower the cable (without probe
and with end cap) back into the inclinometer casing to allow it to release
some of the twist it may have developed, and then wind in up on the reel.
17. Wipe down the probe after each use. Spray a light lubricant (WD-40, or
similar) on the springs, wheel assemblies, and yokes prior to placing in the
protective carrying case. Do not apply this lubricant to the electrical
connection end of the probe.
Please consult the GK-604D Instruction Manuals for more information on the GK-604D
System and GK-604D Reader Application.