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.
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.
| 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 |
| 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) |
| 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:
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 |
| 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 |
| 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 |
| Custom inclined sensors and models available on request. |
| 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 |
| ITEM | PART # |
| 70 mm Hanger | IC8030 |
| 85 mm Hanger | IC8031 |
| ITEM | PART # |
| Safety Line (sold in meters) | IC8040 |
| Safety Line Attachment Kit | IC8045 |
| 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 |
| SENSOR-TO-SENSOR COMMUNICATION CABLE FOR WIRE ROPE CONFIGURATION | |
| 5 m | IC8085 |
| 10 m | IC8085-10M |
| 15 m | IC8085-15M |
| 20 m | IC8085-20M |
| 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 |
| Imperial lengths available upon request |
| Custom casing diameter wheel assemblies |
| Custom bay lengths available |
| DT2485: DT-BUS Data Logger |
| FlexDAQ Data Logger System |
| RSTAR Affinity Wireless Data Logger System |
MEMS Digital In-Place Inclinometer System Brochure
| Language | Version | Download |
|---|---|---|
| English | ICB0082 |
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| Spanish | ICB0084A |
|
| Portuguese | ICB0083A |
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MEMS Digital In-Place Inclinometer System Instruction Manual
| Language | Version | Download |
|---|---|---|
| English | ICM0062K |
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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