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PISA-M – In-Place MEMS Inclinometer

SINGLE SERIAL CABLE INSTALLATION

LOW COST REAL TIME MONITORING

EXCELLENT REPEATABILITY

The in-place MEMS model PISA-M inclinometers are used for continuous and unattended measurements of lateral displacement of soil, rock and structures

Description

The PISA-M in-place MEMS inclinometer is either a uniaxial or biaxial tilt transducer with signal conditioning electronics, housed inside a rugged tube. A set of wheels directs the in-place MEMS inclinometer in the inclinometer casing.

Two configurations are possible: the serial-sensor one (basic configuration) or the single-sensor configuration for monitoring a discrete zone. In the first case, only one jumper cable is required to connect the top of the sensor string to the data logger. In the second case, each sensor is connected via its own cable to the data logger.

The data from the string of sensors in a borehole provides a vertical profile of the borehole. By comparing profiles over time, deflection and rate of movement can be calculated. The PISA-M can be reused on other projects once the monitoring

Specifications

Angular range 

± 10° 

Resolution with SENSLOG

0.0025° 

Repeatability 

± 0.006° 

Output channels 

One or two orthogonal tilt channels: ± 2.5 volts differential per channel 

Power requirements 

+8 to + 15 VDC 

Housing 

Stainless steel, 32 mm diameter, waterproof to 2 MPa 

Weight 

1.6 kg with sensor and 2 m gauge length 

Cable 

Each sensor is supplied with cable sufficient for 3 m gauge lengths 

Casing 

70 or 85 mm diameter casing 

Sensor type 

MEMS tilt sensors for inclination readings 

 

Thermistor for temperature readings 

Max number of sensors *

 50 (40 m), 40 (92 m), 30 (165 m), 20 (258 m), 10 (375 m)

   * Representing nominal limits of serial sensors per length of jumper cable

 

Ordering Info

Please specify:

  • Uniaxial or biaxial version
  • Set of four guide wheels (specify casing size)
  • Tubing for 1, 2 or 3 m gauge length (or custom)
  • Cable length

A standard IPI system requires inclinometer casing, sensors with wheels, gauge tube, jumper cable (serial configuration), signal cable for each sensor (non-serial configuration), a suspension kit, and a data acquisition system.

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