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Horizontal Digitilt Inclinometer Probe
Copyright ©2006 DGSI. All Rights Reserved.
This equipment should be installed, maintained, and operated by technically qualified personnel. Any errors
or omissions in data, or the interpretation of data, are not the responsibility of DGSI (Durham Geo Slope Indi-
cator). The information herein is subject to change without notification.
This document contains information that is proprietary to DGSI and is subject to return upon request. It is
transmitted for the sole purpose of aiding the transaction of business between DGSI and the recipient. All
information, data, designs, and drawings contained herein are proprietary to and the property of DGSI, and
may not be reproduced or copied in any form, by photocopy or any other means, including disclosure to out-
side parties, directly or indirectly, without permission in writing from DGSI.
SLOPE INDICATOR
12123 Harbour Reach Drive
Mukilteo, Washington, USA, 98275
Tel: 425-493-6200 Fax: 425-493-6250
E-mail: solutions@slope.com
Website: www.slopeindicator.com
Horizontal Digitilt
Inclinometer Probe
50303599 Horizontal Digitilt Inclinometer Probe, 2006/5/10
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . 1
Components . . . . . . . . . . . . . . . . . . . . . . . 2
Installation of Casing . . . . . . . . . . . . . . . 4
Taking Readings. . . . . . . . . . . . . . . . . . . . 8
Data Reduction . . . . . . . . . . . . . . . . . . . 11
Maintenance . . . . . . . . . . . . . . . . . . . . . . 14 Digitilt Horizontal Inclinometer Probe, 2006/5/10
1
Introduction
About Horizontal
Inclinometers
Inclinometer casing is installed in a horizontal trench or bore-
hole. As shown in the drawings below, the casing can be open at
both ends, or closed at the far end. When the casing is closed at
the far end, a dead-end pulley and cable-return pipe are also
installed.
The probe, control cable, pull-cable, and readout unit are used
to survey the casing. The initial survey establishes the profile of
the casing, and subsequent surveys will reveal changes in the
profile if ground movement has occurred.
Casing open at both ends
Pull-Cable
on Reel
Readout and Control Cable
Probe
Casing
Casing closed at far end
Return Pipe
Dead-End
Pulley Digitilt Horizontal Inclinometer Probe, 2006/5/10
2
Components
Inclinometer Casing
Inclinometer casing is a special-purpose
pipe used for inclinometer installations.
Grooves inside the casing control the
orientation of the probe and provide a flat
surface for tilt measurements.
Casing is installed with one pair of
grooves aligned vertically, so that there is
top groove and a bottom groove.
Horizontal Probe
The horizontal inclinometer probe is used to obtain tilt
measurements along the length of the casing. It has wheels that
track the grooves in the casing. Always orient the probe so that
its sprung wheels track in the top groove and its fixed wheels
track in the bottom groove.
The probe has identical connectors at each end. Looking at the
probe from the top, you can see that the connectors are labelled
1 and 2.
When the probe is horizontal and connector 1 is raised, the tilt
reading will be a positive value. If connector 1 is lowered below
horizontal, the tilt reading will be a negative value.
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Bottom
Top
Connector 1
Connector 2
Top
View
Fixed wheels track the bottom groove
Sprung wheels track the top groove
Side
View
Fixed Wheel
1
2
+
Digitilt Horizontal Inclinometer Probe, 2006/5/10
3
Pull-Cap and Carabiner
A special pull-cap is supplied with the probe.
This cap is screwed onto either connector to
allow attachment of the pull cable. A snap
carabiner (snap clip) is also supplied with the
probe. It is permanently attached to the pull cable, providing a
quick way to connect and disconnect from the pull cap and
probe. If you have more than one installation, you can order
additional carabiners. The part number is 02750012.
Pull Cable
A stainless steel pull cable is used at the start of every survey to
pull the probe to the far end of the casing. The pull cable is
stored inside the casing when you leave the site.
We recommend that you buy a reel for the pull cable. It is
important that the cable is not twisted or kinked.
The pull cable should be long longer than the casing to allow
easy handling and easy connection to a reel. When a dead-end
pulley is used, the length of the pull cable must be doubled. It
must go through the casing, around the pulley, and through the
return pipe.
Dead-End Pulley
When the far end of the casing is closed, a
dead-end pulley and cable return pipe are
installed so that the pull cable can be
operated from the near end of the casing.
The dead-end pulley is not used when
both ends of the casing are open.
Control Cable
The control cable is used to control the position of the probe
conduct power and signals between the probe and the readout.
Metric control cables are graduated at 0.5 meter intervals and
English control cables are graduated at 2-foot intervals.
Readout
The Digitilt DataMate records the inclinometer survey. Opera-
tion of the DataMate is covered in a separate manual. Digitilt Horizontal Inclinometer Probe, 2006/5/10
4
Installation of Casing
Planning
Site conditions vary widely, so these instructions are general
rather than specific. Read through the instructions, and then
make a plan that is suitable for your site.
Casing Size
Use either 70mm or 85 mm (3.34" or 2.75") casing. The current
version of the horizontal probe (50303510 or 50303500) is
supplied with two sets of wheels that can be interchanged for
different sizes of casing.
The retired version of the horizontal probe (50302910 or
50302900) requires 85mm (3.34") casing and cannot operate in
70mm casing.
Casing Type Slope Indicators Standard casing, is the recommended casing
for horizontal installations. Couplings are glued, so ABS
cement is required. Slope Indicators QC casing is less convenient. Couplings are
harder to snap together and this makes it difficult control ori-
entation of the grooves. Telescoping sections are not needed and not recommended.
Casing Orientation Install the casing with one pair of
grooves oriented vertically, so there is a
top groove and a bottom groove.
Accuracy degrades when grooves are
off vertical by more than 3 degrees. Mark the outside of each section of
casing to show where the top groove is.
This lets you easily check the overall
orientation of the casing during assembly and backfilling. Check the verticality of the top and bottom grooves each time
you add a length of casing. Use a plumb bob or carpenters
level. Keep casing in shipping boxes and in the shade until it is used. Review casing assembly instructions. Try joining two sections
of casing to help predict possible problems. Use clean rags to plug ends of casing. Tie a string onto the
rags, to avoid leaving a rag inside.
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Bottom
Top Digitilt Horizontal Inclinometer Probe, 2006/5/10
5
Pull Cable Pull cable should be longer than the casing to allow easy han-
dling and easy attachment to a reel. If a dead-end pulley is
used, the cable length must be doubled. Put the pull cable on a reel so that it will not kink or carry
sand and dirt into the casing.
Dead-End Pulley If the far end of the casing is closed, you must install a dead-
end pulley and a return pipe.The dead-end pulley should be
oriented vertically, so that the cable will stay on the pulley.
That puts the return pipe above the casing, as shown in the
drawing below. Thus it is probably easiest to assemble the casing first, work-
ing toward the pulley. When you reach the pulley, thread the
pull cable through the pulley, and then assemble the return
pipe, working away from the pulley.
Excavate the Trench Check that the fill has been compacted well before trenching. Site specifications may suggest a width and depth for the
trench, otherwise, make the trench at least 0.5m (1.5') wide
and 0.6m (2') deep. A 3% grade is useful for drainage. Check that the bottom of the trench free from rocks or other
hard materials. Place a 150 mm (6 inch) layer of sand or other finely graded
material on the bottom of the trench and tamp it well so that
casing will be supported by a firm, flat surface.
Assemble the Casing
1.
Position the reel where you will begin assembly of the casing.
Thread the pull cable through each section of casing as it is
added.
2.
Follow casing assembly instructions, but consider that
trenched installations do not require rivets or sealed
couplings.
3.
As you