8/10/2019 Digitilt Inclinometer Probe Datasheet

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S L O P E I N D I C A T O R - G E O T E C H N I C A L & S T R U C T U R A L I N S T R U M E N T A T I O N

1D U R H A M G E O S L O P E I N D I C A T O R

Digitilt Inclinometer Probe

ApplicationsDigitilt inclinometers are used tomonitor subsurface movements ofearth in landslide areas and deepexcavations. They are also used tomonitor deformations in structuressuch as dams and embankments.

OperationInclinometer casing is typicallyinstalled in a vertical borehole thatpasses through suspected zones ofmovement into stable ground. TheDigitilt inclinometer probe, controlcable, pulley assembly, and readoutare used to survey the casing. Thefirst survey establishes the initial pro-file of the casing. Subsequent sur-veys reveal changes in the profile ifground movement occurs.During a survey, the probe is drawnupwards from the bottom of the cas-ing to the top, halted in its travel at0.5 m or 2' intervals for tilt readings.

The inclination of the probe body ismeasured by two force-balanced,servo-accelerometers. One acceler-ometer measures tilt in the plane ofthe inclinometer wheels, which trackthe longitudinal grooves of the cas-ing. The other accelerometer mea-sures tilt in the plane perpendicular tothe wheels.

Inclination measurements are con-verted to lateral deviations, as shownin the drawing below. Changes indeviation, determined by comparingcurrent and initial surveys, indicateground movement.Plotting changes in deviation yields ahigh resolution displacement profile.Displacement profiles are useful fordetermining the magnitude, depth,direction, and rate of ground move-ment.

AdvantagesProven Performance: Digitiltinclinometer probes have earned aworld-wide reputation for durability,

high precision, and rapid response.Repeatable Tracking: To ensureconsistent tracking in all types ofcasing, the probe is equipped withrobust wheel carriages, sealed wheelbearings, and specially designedwheels.

Extended Installation Life: Thecompact size of the Digitilt probeallows it to pass through small radiuscurves, extending the useful life ofthe installation beyond that provided

by other inclinometer probes.Computerized Testing: Each probeundergoes thorough testing on acomputerized calibration table.

Reliable Control Cable: Digitiltcontrol cable is durable and easy tohandle, stays flexible in cold weather,resists chemicals and abrasion, andprovides excellent dimensional sta-bility. Flexible rubber depth marks arepermanently vulcanized to the cable

jacket. The marks cannot loosen and

have no rigid edges that can damagethe cable jacket and conductors.

Consistent Depth Control: Thepulley assembly, a recommendedaccessory, helps the operatorachieve uniform depth control. Theone-way action of its cable clampensures consistent positioning of theprobe.

Complete Solutions: Slope Indica-tors inclinometer system includeshigh-quality casing, vertical andhorizontal traversing probes, verticaland horizontal in-place sensors,recording readouts, graphing soft-ware, and specialized accessories.

8/10/2019 Digitilt Inclinometer Probe Datasheet

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Slope Indicator Head Office 12123 Harbour Reach Drive, Mukilteo, WA, 98275 USATel: 425-493-6200 Tel: 800-331-0703 Fax: 425-493-6250 Email: solutions@slope.com

Copyright 3/2006 by Slope Indicator, a division of Durham Geo-Enterprises. Products and specifications are subject to review and change without notice.

W W W . S L O P E I N D I C A T O R . C O M

SLOPE INDICATOR

D U R H A M G E O S L O P E I N D I C A T O R

METRIC PROBE SPECIFICATIONS

Wheel base: 500 mm.Range: 53 from vertical.Resolution: 0.02 mm per 500 mm.Repeatability: 0.003.Calibration: 14 point calibration with NISTtraceable calibration device.Temperature Rating: -20 to +50 C.Dimensions: 25.4 x 653 mm. Control cableconnector adds 92 mm to length of probe.Weight: 1.8 kg.Material: Stainless steel.

ENGLISH PROBE SPECIFICATIONS

Wheel base: 24".Range: 35 from vertical.Resolution: 0.0012 inch per 24 inches.Repeatability: 0.003.

Calibration: 14 point calibration with NISTtraceable calibration device.Temperature Rating: -4 to +122 F.Dimensions: 1 x 30". Control cableconnector adds 3.75"to length of probe.Weight: 4 lb.Material: Stainless steel.

ACCURACY SPECIFICATIONS

Metric Systems: 0.25 mm per reading, or6 mm accumulated over 50 readings.English Systems: 0.01 inch per reading, or

0.3 inch accumulated over 50 readings.These system accuracy specifications werederived empirically from the analysis of a largenumber of surveys and include both random andsystematic errors introduced by casing, probe,cable, readout, and operator. Casing wasinstalled within 3 degrees of vertical, and opera-tors followed recommended reading practices.With careful installation of casing, redundantsurveys, and corrections for systematic error, sys-tem accuracy can be improved to approximately1 mm and 0.05 inch per fifty readings.

DIGITILT INCLINOMETER PROBE

Metric-Unit Probe . . . . . . . . . . . . 50302510English-Unit Probe . . . . . . . . . . . . 50302500Digitilt inclinometer probe includes a carryingcase and instruction manual. Control cable,pulley, and readout are not included.

CONTROL CABLE

30m Control Cable, Complete . . . 5060103050m Control Cable, Complete . . . 50601050100m Control Cable, Complete . . 50601100

100 ft Control Cable, Complete . . 50601002150 ft Control Cable, Complete . . 50601003300 ft Control Cable, Complete . . 50601004

Metric Cable, Custom Length. . . . 50601010English Cable, Custom Length . . . 50601000Connector for Readout . . . . . . . . 50301800Connector for Probe. . . . . . . . . . . 50303100Control cables listed as complete are standardlengths of cable and include connectors. If you

order a custom length cable, you must also orderconnectors.Control cable is supplied with no splices or sur-face defects and has a rated strength of 480 lband a working strength of 120 lb.Metric cable is graduated with yellow 0.5-metermarks and red 1-meter marks. English cable isgraduated with yellow 2-foot marks and red 10-foot marks.Cable has a steel core wire to control stretching,a torsion braid to counter cable torque, a binderlayer to eliminate slipping of cable jacket relativeto the steel core, and depth marks that are vulca-

nized onto the cable jacket. The Neoprene cable jacket resists chemicals and abrasions and isflexible in cold temperatures.Reels used to store cable should have hubs witha diameter of eight inches or more. Power reelsshould have hub diameter of sixteen inches.

PULLEY ASSEMBLY

Small Pulley . . . . . . . . . . . . . . . . . 51104604Large Pulley . . . . . . . . . . . . . . . . . 51104606Pulley assembly clamps onto top of casing tohelp operator control depth of probe. Cableclamp serves as reference for depth marks.

Removable pulley wheel facilitates insertion ofprobe into casing.Use small pulley with 48 or 70 mm (1.9 or 2.75")casing. Use large pulley with 70 or 85mm (2.75or 3.34") casing.

READOUTS

Digitilt DataMate . . . . . . . . . . . . .50310900The Digitilt DataMate is a recording readout. ThDigitilt 09 is a manual readout. See separatedata sheets for details.

DUMMY PROBE

Metric Wheel Base . . . . . . . . . . . . 50304810English Wheel Base. . . . . . . . . . . .50304800Reel & Line for Dummy Probe . . . .50304900Dummy probe is used to test for casing continu-ity, groove continuity, and obstructions or severedistortions of casing that could hinder retrievalof Digitilt probe and control cable. Dummy probis stainless steel and has dimensions and wheelsidentical to those of Digitilt probe.Reel with 60 m (200') of nylon line is used tolower and retrieve dummy probe.

SLIP-RING REELS

200 m (650') capacity . . . . . . . . . .50503100300 m (1150') capacity . . . . . . . . .50503300Sturdy slip-ring cable reel allows the readout toremain connected while the reel is operated.Jumper cable, included, connects readout to reel

STORAGE REELS

50 m (164') capacity . . . . . . . . . . .50502050100 m (360') capacity . . . . . . . . . .50502110

Sturdy storage reel with large diameter hubkeeps cable neat when not in use.

Slip-Ring Cable Reel