MEMS Digital In-Place Inclinometer System

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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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Overview

Each IPI employs MEMS accelerometer sensors housed inside a 28.6 mm (1.125 in.) diameter, watertight, 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 for 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 casings.

The sensors are read through a connectorized signal cable designed to chain 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.

Designed for ease of installation, serviceability and fast delivery, RST’s In-Place Inclinometer System comes standard for both biaxial and uniaxial in one model.


MEMS Digital In-Place Inclinometer Sensor Specifications

Range ± 30°
Resolution 0.0002° (0.004 mm/m)1
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/m 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

ITEM PART #
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

ITEM PART #
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
Contact RST if a custom sensor is required.

 

Borehole Accessory Kit Ordering

ITEM PART #
70 mm Borehole Accessory Kit
(70 mm Collar Hanger, Bottom Plug, Safety Cable Attachment Kit, Extra Screws)
IC8000
85 mm Borehole Accessory Kit
(85 mm Collar Hanger, Bottom Plug, Safety Cable Attachment Kit, Extra Screws)
IC8001

 

Collar Hanger Ordering

ITEM PART #
70 mm Hanger IC8030
85 mm Hanger IC8031

 

Safety Line Ordering

ITEM PART #
Safety Line (sold in meters) IC8040
Safety Line Attachment Kit IC8045

 

Cable and Plugs Ordering

ITEM PART #
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 Wire Rope Communication Cable Extension IC8085

 

Wire Rope and Related Wire Rope Products Ordering

ITEM PART #
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

 

Options

Imperial lengths available upon request
Custom casing diameter wheel assemblies
Custom bay lengths available
DT2485: DT-BUS Data Logger
FlexDAQ Data Logger System

File Name

MEMS Digital In-Place Inclinometer System

Resource Type

Brochure
Language Version Download
English ICB0082A
Spanish ICB0084A
Portugese ICB0083A

File Name

MEMS Digital In-Place Inclinometer System Instruction Manual

Resource Type

Manual
Language Version Download
English ICM0062J

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