Digital Inclinometer Spiral Sensor


The RST Digital MEMS Inclinometer Spiral Sensor is used to determine down-hole helical deformation of installed inclinometer casing.


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Product Features

  • "Hot swap" capability with RST's Digital Inclinometer System
  • No additional software required
  • Inertial sensor eliminates errors due to sensor offset, wheel/groove clearance, friction, and magnetic declination
  • Compact and lightweight design


The RST Digital MEMS Inclinometer Spiral Sensor is used to determine down-hole helical deformation of installed inclinometer casing. Installed casing spiral is a function of the manufacturing process, casing coupling, and installation technique.

Best casing installation practice requires that the casing be installed with the correct azimuth from the start and throughout the installation, with no torque applied either intentionally or otherwise during the installation. Such carefully installed RST inclinometer casing would typically maintain groove azimuth to within a few degrees over 30 metres. However, for very deep installations, or installations where twist due to installation problems is suspected, the Digital MEMS Inclinometer Spiral Sensor permits measurement of the installed groove azimuth down-hole.

Operation is similar to the RST Digital Inclinometer, using the same cable, reel, and hand-held readout. It is only necessary to read one data set; no 180 degree second reading set is required. Typically this measurement is only performed once in the life of the hole, as the casing is torsionally restrained by the backfill, typically grout. RST Inclinalysis™ Inclinometer Software processes the resulting spiral data set.

The Digital Inclinometer Spiral Sensor is supplied in a robust carrying case.


Material Stainless Steel
Weight 1 kg
Overall Length 570 mm
Gauge Length 400 mm
Accuracy ±1° per 30 m typical
Resolution 0.1°
Compatible Casing Sizes 70 mm (2.75 in.) and 85 mm (3.34 in.)

Digital Inclinometer Spiral Sensors are commonly used for determining spiral deformation of inclinometer casing installed in very deep boreholes.

Digital Inclinometer Spiral Sensor

Digital Inclinometer Spiral Probe IC32705

File Name

Digital Inclinometer Spiral Sensor Instruction Manual

Resource Type

Language Version Download
English ICM0039H

File Name

Digital Inclinometer Spiral Sensor

Resource Type

Language Version Download
English ICB0003M
Spanish ICB0076A

Speak with an Expert

I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd