| Inclinometer casing is typically
installed in a vertical borehole that
passes through suspected zones of
movement into stable ground. The
Digitilt inclinometer probe, control
cable, pulley assembly, and readout
are used to survey the casing. The
first survey establishes the initial profile
of the casing. Subsequent surveys
reveal changes in the profile if
ground movement occurs.
During a survey, the probe is drawn
upwards from the bottom of the casing
to the top, halted in its travel at
0.5 m or 2' intervals for tilt readings.
The inclination of the probe body is
measured by two force-balanced,
servo-accelerometers. One accelerometer
measures tilt in the plane of
the inclinometer wheels, which track
the longitudinal grooves of the casing.
The other accelerometer measures
tilt in the plane perpendicular to
the wheels.
Inclination measurements are converted
to lateral deviations, as shown
in the drawing below. Changes in
deviation, determined by comparing
current and initial surveys, indicate
ground movement.
Plotting changes in deviation yields a
high resolution displacement profile.
Displacement profiles are useful for
determining the magnitude, depth,
direction, and rate of ground movement. |
 |
Proven Performance: Digitilt
inclinometer probes have earned a
world-wide reputation for durability,
high precision, and rapid response.
Repeatable Tracking: To ensure
consistent tracking in all types of
casing, the probe is equipped with
robust wheel carriages, sealed wheel
bearings, and specially designed
wheels.
Extended Installation Life: The
compact size of the Digitilt probe
allows it to pass through small radius
curves, extending the useful life of
the installation beyond that provided
by other inclinometer probes.
Computerized Testing: Each probe
undergoes thorough testing on a
computerized calibration table.
Reliable Control Cable: Digitilt
control cable is durable and easy to
handle, stays flexible in cold weather,
resists chemicals and abrasion, and
provides excellent dimensional stability.
Flexible rubber depth marks are
permanently vulcanized to the cable
jacket. The marks cannot loosen and
have no rigid edges that can damage
the cable jacket and conductors.
Consistent Depth Control: The
pulley assembly, a recommended
accessory, helps the operator
achieve uniform depth control. The
one-way action of its cable clamp
ensures consistent positioning of the
probe.
Complete Solutions: The
inclinometer system includes
high-quality casing, vertical and
horizontal traversing probes, vertical
and horizontal in-place sensors,
recording readouts, graphing software,
and specialized accessories. |
| Metric-Unit Probe |
SI50302510 |
| English-Unit Probe |
SI50302500 |
| Digitilt inclinometer probe includes a carrying
case and instruction manual. Control cable,
pulley, and readout are not included. |
| Wheel base: |
500 mm |
| Range |
±53° from vertical |
| Resolution |
0.02 mm per 500 mm |
| Repeatability |
±0.01% FS |
| Calibration |
14 point calibration with NIST traceable calibration device |
| Temperature Rating |
-20 to +50 °C |
| Dimensions |
25.4 x 653 mm. Control cable
connector adds 92 mm to length of probe. |
| Weight |
1.8 kg |
| Material |
Stainless steel |
| Wheel base |
24" |
| Range |
±35° from vertical |
| Resolution |
0.0012 inch per 24 inches |
| Repeatability |
±0.01%FS |
| Calibration |
14 point calibration with NIST
traceable calibration device |
| Temperature Rating |
-4 to +122 °F |
| Dimensions |
1 x 30". Control cable connector adds 3.75"to length of probe |
| Weight |
4 lb. |
| Material |
Stainless steel |
| Metric Systems |
±0.25 mm per reading and
±6 mm per 50 readings |
| English Systems |
: ±0.01 inch per reading and
±0.3 inch per 50 readings. |
| These system accuracy specifications were
derived empirically from the analysis of a large
number of surveys and include both random and
systematic errors introduced by casing, probe,
cable, readout, and operator. Casing was
installed within 3 degrees of vertical, and operators
followed recommended reading practices.
When corrections for systematic error are made,
the remaining error is random. It accumulates
with the square root of the number of readings.
Thus the best precision obtainable with a metric
system is approximately ±1.4 mm per fifty readings,
and the best precision of an English unit
system is approximately ±0.05 inch per fifty
readings. |
| 30m Control Cable, Complete |
SI50601030 |
| 50m Control Cable, Complete |
SI50601050 |
| 100m Control Cable, Complete |
SI50601100 |
| 100 ft Control Cable, Complete |
SI50601002 |
| 150 ft Control Cable, Complete |
SI50601003 |
| 300 ft Control Cable, Complete |
SI50601004 |
| Metric Cable, Custom Length |
SI50601010 |
| English Cable, Custom Length |
SI50601000 |
| Connector for Readout |
SI50301800 |
| Connector for Probe |
SI50303100 |
Control cables listed as complete are standard
lengths of cable and include connectors. If you
order a custom length cable, you must also order
connectors.
Control cable is supplied with no splices or surface
defects and has a rated strength of 480 lb
and a working strength of 120 lb.
Metric cable is graduated with yellow 0.5-meter
marks and red 1-meter marks. English cable is
graduated with yellow 2-foot marks and red 10-
foot marks.
Cable has a steel core wire to control stretching,
a dacron torsion braid to counter cable torque
and eliminate slipping of cable jacket relative to
the steel core, and depth marks that are molded
onto the cable jacket. The Santoprene cable
jacket resists chemicals and abrasions and stays
flexible in cold temperatures. |
| Small Pulley |
SI51104604 |
| Large Pulley |
SI51104606 |
| Pulley assembly clamps onto top of casing to
help operator control depth of probe. Cable
clamp serves as reference for depth marks.
Clamp is made of carbon-fiber and does not
freeze in cold weather. Removable pulley wheel
facilitates insertion of probe into casing.
Use small pulley with 48 or 70 mm (1.9 or 2.75")
casing. Use large pulley with 70 or 85mm (2.75
or 3.34") casing. |
| Digitilt DataMate II |
SI50310900 |
| The Digitilt DataMate II is a recording readout.
The Digitilt 09 is a manual readout. |
| Metric Wheel Base |
SI50304810 |
| English Wheel Base |
SI50304800 |
| Reel & Line for Dummy Probe |
SI50304900 |
| Dummy probe is used to test for casing continuity,
groove continuity, and obstructions or severe
distortions of casing that could hinder retrieval
of Digitilt probe and control cable. Dummy probe
is stainless steel and has dimensions and wheels
identical to those of Digitilt probe.
Reel with 60 m (200') of nylon line is used to
lower and retrieve dummy probe. |
| 200 m (650') capacity |
SI50503100 |
| 300 m (1150') capacity |
SI50503300 |
| Slip-ring cable reel allows the readout to remain
connected while the reel is operated. Includes
jumper cable to connect reel to readout. |
| 30m (100’) capacity |
SI50502030 |
| 70 m (230') capacity |
SI50502050 |
| 100 m (360') capacity |
SI50502110 |
| Sturdy storage reel with large diameter hub
keeps cable neat when not in use.
Note: The use of reels is optional. Cable can also
be stored in a figure-8 or using the over-under
method of coiling cable, as presented in the
manual. If you choose to use a reel, be sure that
the hub of the reel has a diameter of eight inches
or larger (as do the reels above). Power reels
should be sixteen inches or larger. |
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