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G6 Gauge – 2-axis crack monitor
If you would like a quotation or have any questions about the product, please contact us:
- by email at info@saugnac-gauges.com
- by telephone on +33 9 62 07 18 68
141,20€ w/o VAT per box 5 units
Made in France
0.1 mmIn translation and rotation
2 axesOpening and shear
X and Y calculationSaugnac.app application
Indoor / outdoorPVC with UV stabiliser| Resolution | 0.1 mm in translation and rotation, i.e. 0.1 mm horizontally (X) and 0.33 mm vertically (Y) |
|---|---|
| Monitoring type | 2-axis crack monitoring |
| Crack type | Crack in a single plane with movement on 2 axes, typically with uneven width |
| Usage | Indoor / Outdoor: weather and UV resistant |
| Fixing | Adhesive bonding with supplied self-adhesive tabs, or mechanical fixing with screws (sold separately) |
| Self-adhesive installation conditions | Installation temperature: between -10 °C and 35 °C. Effective bonding from -40 °C to +80 °C |
| Dimensions | 200 mm x 95 mm x 3 mm |
| Measurement range | approx. 20 mm (possible variation between maximum and minimum reading) |
| Weight | 20 g |
| Material | Impact-resistant calendered PVC with UV stabiliser |
| Linear expansion coefficient | 7 × 10⁻⁵ m/m/°C |
The G6 gauge is designed to measure changes in the opening (gap) and shear displacement of crack edges, or any type of joint, within a single plane.
The combination of 2 verniers — for translation and rotation — allows the device to track deformation changes under different stress conditions.
This device is recommended for studying cracks with uneven edges — wider at one end — typically caused by differential settlement or subsidence.
Illustrative example: ground subsidence.
More generally, the G6 gauge is used to monitor any movement along 2 axes: an opening and a shear displacement between 2 structures. When used with an aluminium angle bar, it is also possible to monitor settlement and opening between two structures meeting at an angle (see installation examples below).
Each gauge has a unique QR code and identifier, enabling direct monitoring within the Saugnac application supplied with the product.
Two fixing methods are available for the G6 gauge:
Fixing is quick and easy using the supplied double-sided self-adhesive tabs. On smooth surfaces — partitions, interior walls, wallpaper or thin plaster — the self-adhesive tabs alone will be sufficient.
If necessary, particularly if the surface is not completely flat or has irregularities, bonding can be reinforced with a fast-curing twin-syringe epoxy adhesive.
For rough, damp or difficult surfaces, fix using large-head screws. The G6 gauge is pre-drilled with 3 holes of Ø 4 mm, making mechanical fixing straightforward on any surface type.
For difficult surfaces (crumbling, dusty, uneven or damp), mechanical fixing is recommended to prevent any risk of detachment. Bags of 50 screws and wall plugs are available, as well as a ready-to-use mechanical fixing kit including a 4 mm drill bit, a screwdriver and 40 plugs and screws.
Ideally, the gauge should be fixed so that the arm is perpendicular to and straddles the crack.
To make movement interpretation easier, it is recommended to position:
This ensures that the sliding tongue arm is parallel to the long side of the gauge body.
For vernier T, the T marker sits between graduations 10 and 11 on the main scale: the reading is therefore 10 mm.
For vernier R, the R marker sits between graduations 49 and 50 on the main scale: the reading is therefore 49 mm.
Find the vernier line that aligns with a line on the main scale.
For vernier T, graduation 7 aligns with a line on the main scale: the decimal value is therefore 0.7 mm.
The T reading is therefore 10.7 mm.
For vernier R, graduation 9 aligns with a line on the main scale: the decimal value is therefore 0.9 mm.
The R reading is therefore 49.9 mm.
The G6 gauge can be protected by a transparent PMMA sheet measuring 150 × 300 × 1.1 mm.
This protection is recommended when the gauge is installed in busy areas, schools or public places.
In locations with heavy footfall and a significant risk of damage, the removable E1 gauge with P2E1 plates for 2-axis monitoring may be used instead. After each reading, only the transparent plates remain on the surface, eliminating any risk of damage.
To make rotation interpretation easier, X and Y values can be calculated using the following reference frame:
The diagram below shows an example where the gauge body is intentionally not aligned with the sliding arm, in order to clearly illustrate the reference frame principle.
The initial position at installation defines the reference frame. For ease of interpretation, it is recommended to fix the gauge body parallel to the sliding tongue arm axis where possible (see installation tips above). This way, the X axis is parallel to the gauge body.
Example of the initial reference frame after a rotation movement:
The movement value along the Y axis corresponds approximately to the difference between two R vernier readings, multiplied by 3.3.
Example:
Movement along the X axis simply corresponds to the difference in the T vernier readings. Rotation causes a negligible variation in X: a change of 0.1 mm on the Y axis corresponds to a difference of 0.5 micrometres on the X axis (i.e. 0.0005 mm).
The Saugnac web application is completely free with no limitations and is available on PC and smartphone at https://saugnac.app. It allows you to:
Find out more about the Saugnac application.
Fast-curing epoxy adhesive in a twin-syringe for reinforced bonding in cases of significant surface roughness or high moisture
Mechanical fixing kit for surfaces unsuitable for self-adhesive installation (includes 1 drill bit + 1 PZ1/PZ2 screwdriver + 40 wall plugs and screws)
Bag of 50 anchors and screws for mechanical fixing on surfaces unsuitable for self-adhesive mounting
For measuring the variation in a crack in a vertical or horizontal internal angle (with self-adhesive tabs and 1 impact anchor).
Protection with anti-UV for G6 gauges fixed outside. Delivered with impact anchors.
If you would like a quotation or have any questions about the product, please contact us: