Versatile and flexible, SAAF is the most popular ShapeArray model. A range of available segment lengths enables tailoring of spatial resolution and maximum curvature. Ideal for long-term monitoring horizontally, vertically, or in an arc.


Segment Length:
200, 305, and 500 mm


All-purpose shape monitoring

Project Duration:
Short and long term

The SAAF is the most popular and versatile type of ShapeArray that Measurand manufactures. SAAF measures ground and structural deformation, settlement, and subsidence. SAAF’s design—rigid stainless steel sensorized segments connected by flexible joints—is durable. SAAF may be installed near vertical to track the magnitude and direction of lateral deformation, or near horizontal to track vertical deformation.

SAAF is configurable with smaller segments than other ShapeArray models. Smaller segments mean data is sampled at more points, providing much higher spatial resolution of measurement data. Smaller segments also allow for greater curvature tolerance, making SAAF perfect for cross-section installation to monitor convergence in tunnels.

ShapeArray installation and removal is fast and low-cost, typically requiring far fewer people than traditional in-place inclinometers. ShapeArray is rolled off a reel and set into a narrow diameter PVC casing (27 mm), which is grouted into a borehole.

SAAF is available in 200 mm, 305 mm, and 500 mm segment-length configurations. SAAF can be manufactured to a maximum length of 150 m. All ShapeArrays are manufactured in an ISO 9001 certified facility.

"After several installations, we were really satisfied that SAA provided continuous deformation profiles and  reliable data in our pile lateral loading tests."

Eric Hoe
Diagnostic Engineering Consultants, Ltd.

Technical Overview

ShapeArrays contain three MEMS sensors and a temperature sensor in every segment that measures tilt relative to gravity. SAAF can be installed near vertical to measure the magnitude and direction of lateral deformation to create 3D data or near horizontal to track vertical deformation to create 2D data. Additionally, SAAF can also be installed along the cross-section (circumference) of tunnels and used in “mixed H/V” mode to measure convergence.

The most important benefit of using ShapeArray is automation. Data from the ShapeArray can be collected by a data logger where it can be stored and manually collected or streamed wirelessly to a PC or central server. Data can also be retrieved in the field manually through the SAAFPU.