Digital Bus In-Place Inclinometer System


**This product has been DISCONTINUED**

Digital Bus In-place MEMS Inclinometer Systems (IPI) are designed to measure lateral movement of inclinometers when remote and continuous monitoring is required.


**This product has been DISCONTINUED**

Each IPI employs MEMS accelerometer sensors housed inside a 31.75 mm (1.25 in.) diameter, water-tight, stainless steel enclosure. The sensor body is rigidly connected to a 25.4 mm (1.0 in.) diameter bay rod which establishes the length of the IPI. Multiple IPIs are assembled with pivots allowing sensing of displacement over discreet, configurable intervals. Wheel assemblies centralize the pivot point and establish the azimuth of each IPI. They are available in sizes to fit 70 mm (2.75 in.) or 85 mm (3.34 in.) O.D. inclinometer casing.

The sensors are read through a connectorized signal cable designed to chain together multiple sensors. A datalogger is used to monitor the deflection of each sensor on the digital bus. If necessary, an alarm can be triggered when movement reaches a threshold rate or magnitude.

Digital Bus In-Place Inclinometer System Specifications


Range ±15°
Resolution ±1 arc sec. (±0.0003°) (0.004 mm/m)
Non-linearity ±0.0125% F.S. (±0.002°) (0.03 mm/m)
Repeatability ±0.0125% F.S. (±0.002°) (0.03 mm/m)
Sensor MEMS (Micro-Electro-Mechanical Systems) Accelerometer – Triaxial
Sensor Offset +/- 0.002 arc deg./deg. C
Sensor Sensitivity +/- 0.013 % of reading/deg. C
Supply Voltage 8 – 15V DC
Operating Temp. -40 to 60°C (-40 to 140°F)
Ingress Protection IP68 to 200m H20 (2 MPa)


Gauge Length 0.5 – 3 meters
Housing Diameter 31.75 mm (1.25 in.) (sensor)
Wheel Assembly 70 mm (2.75 in.)
85 mm (3.34 in.)
Bay Rod Diameter 25.4 mm (1.0 in.)

The Digital Bus In-Place Inclinometer System is ideal for monitoring of:

  • Stability adjacent to excavations or underground workings
  • Dams and embankments
  • Landslides
  • Deflection of piles, piers, abutments, or retaining walls.

Digital Bus In-Place Inclinometer System Ordering Info

General Info Required

Part number
Bay length
Number of boreholes
Wheel assembly size
(70 or 85 mm casing)
Number of sensors per borehole
Length of surface signal cable
Location of sensors in borehole
Optional wire rope bays


Sensor Ordering

Digital Bus Cable System

MEMS IPI bus sensor assembly: Biaxial for 70 mm casing IC7565B
MEMS IPI bus sensor assembly: Biaxial for 85 mm casing IC7575B
MEMS IPI bus sensor assembly: Uniaxial for 70 mm casing IC7560B
MEMS IPI bus sensor assembly: Uniaxial for 85 mm casing IC7570B

Digital Wire Rope System with Bottom Wheel Assembly

MEMS IPI assembly: Biaxial 70 mm casing IC7525B
MEMS IPI assembly: Biaxial 85 mm casing IC7555B
MEMS IPI assembly: Uniaxial 70 mm casing IC7520B
MEMS IPI assembly: Uniaxial 85 mm casing IC7550B


Bay Rod Ordering

Digital Bus or Digital Wire Rope Systems

Bay rod for 0.5 m gauge length IC7700
Bay rod for 1 m gauge length IC7701
Bay rod for 1.5 m gauge length IC7702
Bay rod for 2 m gauge length IC7703
Bay rod for 2.5 m gauge length IC7704
Bay rod for 3 m gauge length IC7705


Cable Ordering

Digital Bus and Digital Wire Rope System

4 conductor, 22 gauge polyurethane jacketed cable (digital bus) EL380004

Suspension Cable – Wire Rope System or Collar to First Bay

Stainless steel suspension cable 3/32” IC7300


Collar Hanger Ordering

Digital Bus System

Collar hanger w/1 bottom wheel assembly for 70 mm casing IC7070
Collar hanger w/1 bottom wheel assembly for 85 mm casing IC7085

Digital Wire Rope System

Collar hanger for 70 mm casing IC7070R
Collar hanger for 85 mm casing IC7085R



Imperial lengths available upon request
Submersible cable connector for bus options
DT2485: DT-BUS Data Logger
FlexDAQ Data Logger System

File Name

Digital Bus In-Place Inclinometer System

Resource Type

Language Version Download
English ICB0044F
Spanish ICB0048D

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