MEMS Digital In-Place Inclinometer System


RST’s new, MEMS Digital In-Place Inclinometer (IPI) System is designed to reliably measure lateral movement in and around dams, embankments, landfills, landslides, piles, piers, retaining walls, and abutments, particularly when continuous remote monitoring is required. It provides an early warning for movements, essential for protecting life and equipment.


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Product Features

  • Up to 70% reduction in installation time compared to previous generation
  • IP68 (2 MPa), stainless steel enclosure
  • Wet-mate submersible connector
  • Precision locking & tools free bay rod connections
  • Industry-leading system weight


MEMS Digital In-Place Inclinometer Systems (IPI) are designed to measure lateral movement when remote and continuous monitoring is required. Each IPI employs MEMS accelerometer sensors housed inside a 28.1 mm (1.125 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) OD inclinometer casing. The sensors are read through a connectorized signal cable which chains together multiple sensors. A data logger 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.

MEMS Digital In-Place Inclinometer Sensor Specifications

Range ± 30°
Resolution 0.0002° (0.004 mm/m)
Sensor Accuracy ± 0.002° (0.03 mm/m)1
Sensor Precision ± 0.0013° (0.02 mm/m)1
± 0.0005° (0.01 mm/m)2
Sensor 24  h Stability ± 0.03° mm/m1

± 0.01° mm/m2

System Precision ± 0.5 mm for 30 m IPI (15 sensors @ 2 m, 6
months, repeatability conditions in borehole)
Sensor MEMS (Micro-Electro-Mechanical Systems) Accelerometer
Temperature Dependent Uncertainty ± 0.016 mm/m/°C (±0.001°/°C) , for ± 5° from vertical
± 0.033 mm/m/°C (±0.002°/°C) , for ± 15° from vertical
Temperature Accuracy ± 0.5 °C (0°C to 60°C)
± 1.0 °C (-40°C to 60°C)
Temperature Resolution 0.06°C


Electrical Specifications

Supply Voltage 5 to 15V DC
Operating Current 490 uA (Reading Average, per sensor)
Standby Current <20uA (per sensor)
Signal Output RS485 Digital Bus (MODBUS RTU Protocol)
Operating Temp. -40 to 60°C (-40 to 140°F)


Mechanical Specifications

Ingress Protection IP68 (2 MPa)
Gauge Length 0.5 to 3 m
Sensor Diameter 28.6 mm (1.125 in)
Bay Rod Diameter 25.4 mm (1.0 in)
Wheel Assembly 70 mm (2.75 in)
85 mm (3.34 in)
System Maximum Weight 180 kgf
Sensor & Bay Rod Assembly Weight (dry, submerged H20) 0.5m: 1.25, 1.00 kgf
1.0m: 1.63, 1.12 kgf
1.5m: 2.00, 1.24 kgf
2.0m: 2.37, 1.36 kgf
3.0m: 3.11, 1.60 kgf

1:99% Confidence Interval, 2:68% Confidence Interval


The MEMS Digital 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.

MEMS Digital 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
Optional wire rope bays and cables


Bay Rod Ordering

0.5 m Bay Rod IC8011
1.0 m Bay Rod IC8012
1.5 m Bay Rod IC8013
2.0 m Bay Rod IC8014
3.0 m Bay Rod Bay Rod IC8015
Custom Metric Length Bay Rod IC8010
3.0 ft Bay Rod IC8021
5.0 ft Bay Rod IC8022
10.0 ft Bay Rod IC8023
Custom Imperial Length Bay Rod IC8020


Sensor Ordering

Vertical 70 mm IPI IPI27050-U-70mm
Vertical 85 mm IPI IPI27050-U-85mm
Horizontal 70 mm IPI IPI27050-D-70mm
Horizontal 85 mm IPI IPI27050-D-85mm
Custom inclined sensors and models available on request.


Borehole Accessory Kit Ordering

70 mm Borehole Accessory Kit
(70 mm Collar Hanger, Bottom Plug, Safety Cable Attachment Kit, Extra Screws)
85 mm Borehole Accessory Kit
(85 mm Collar Hanger, Bottom Plug, Safety Cable Attachment Kit, Extra Screws)


Collar Hanger Ordering

70 mm Hanger IC8030
85 mm Hanger IC8031


Safety Line Ordering

Safety Line (sold in meters) IC8040
Safety Line Attachment Kit IC8045


Cable and Plugs Ordering

5 m Top Cable IC8051
10 m Top Cable IC8052
20 m Top Cable IC8053
Custom Length Top Cable IC8050
Bottom Cable Male Plug IC8060
5 m IC8085
10 m IC8085-10M
15 m IC8085-15M
20 m IC8085-20M


Wire Rope and Related Wire Rope Products Ordering

Wire Rope (sold in meters) IC8065
70 mm Wire Rope Accessory Kit (Wheel Assembly, Adapter) IC8070
85 mm Wire Rope Accessory Kit (Wheel Assembly, Adapter) IC8071
70 mm Wire Rope Wheel Assembly IC8075
85 mm Wire Rope Wheel Assembly IC8076
Male Adapter for Wire Rope IC8080



Imperial lengths available upon request
Custom casing diameter wheel assemblies
Custom bay lengths available
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File Name

MEMS Digital In-Place Inclinometer System Brochure

Resource Type

Language Version Download
English ICB0082
Spanish ICB0084A
Portuguese ICB0083A

File Name

MEMS Digital In-Place Inclinometer System Instruction Manual

Resource Type

Language Version Download
English ICM0062K

Speak with an Expert

RST has been one of our trusted partners for years in providing solutions to a wide range of our instrumentation needs—from the prompt shipment of piezometers and inclinometer casing, to the annual calibration of our inclinometer systems. RST takes the time to learn about our projects and provides value by collaborating with us on our monitoring strategy.
-Elke Declercq, Geotechnical Dept – Flemish Government