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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.

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
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Description

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.

Spesification

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

Applications

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.

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