G3 Gauge

Technical specifications

Overview of the G3 gauge for monitoring misalignment / offset

The G3 gauge is designed to measure the evolution of a vertical misalignment (uneven floor slabs) or horizontal misalignment, or more generally, the evolution of movement perpendicular to an “X,Y” reference plane.

Monitoring the evolution of a horizontal misalignment: floor slab failure or ceiling sagging (A = structure whose movement is to be measured, B = fixed reference structure, d = misalignment)

Monitoring the evolution of a vertical misalignment: pillar leaning out of true or structure sliding (A = structure whose movement is to be measured, B = fixed reference structure, d = misalignment)

The measurement is taken using a vernier reading to 1/10th of a mm, corresponding to 2/10th of a mm of movement.

A = B: Plane Z
C: Plane XY
D: Misalignment
(1) double-sided self-adhesive tab 50 X 50 mm
(2) aluminium sensor ø 4 mm, length 70 mm

How to fix the G3 gauge?

Its cube shape allows it to be used in any position: on a plinth, in vertical or horizontal angles, by choosing one of its 5 faces to fix the gauge (see below for examples of installations).

Two fixing methods are possible:

• By bonding: fixing is quick and easy thanks to the double-sided self-adhesive tabs supplied. The supplied self-adhesive is applied to one of the 5 available faces of the cube so the fixing can be adapted to the location and the measurement to be taken. Two stickers are supplied to allow the gauge to be reused or to compensate for a bonding error.
  For the bonding to be effective, the surface must be smooth and clean. If necessary, and particularly if the surface is not perfectly flat and has rough spots, the bond can be reinforced with a fast-curing epoxy glue in a twin syringe. In this case, it is also possible to use the epoxy glue directly on the gauge without using the double-sided adhesive.
• By mechanical fixing: where the surface is very uneven, or crumbles with a risk of the gauge coming loose, we recommend using an intermediate plate. This plate is mechanically fixed to the surface with self-tapping screws (supplied with the plate), and the gauge is bonded to this plate. The plate then becomes the mounting surface.

A: 2 4/40 screws, B: Intermediate plate, C: Self-adhesive tab, D: E.J

The sensor length is adapted to the size of the misalignment: an offset of up to approximately 50 mm is possible; beyond that, a special assembly is required, please contact us if needed.

Examples of installations:

G3 gauge installed on a ceiling with the supplied self-adhesive tabs

G3 gauge installed with an intermediate plate on an uneven and damp surface

G3 gauge fixed on its side to measure settling

G3 gauges fixed to measure a pillar leaning out of true relative to its capital following an earthquake

Adjusting the sensor length according to the misalignment

Creating a special assembly for a large misalignment

How to protect the G3 gauge?

We offer protection with a thermoformed plastic cover or an IP65 aluminium cover.

1- Protection with the plastic cover
A semi-flexible, transparent cover measuring 27 X 13 X 9 cm is designed to protect the gauge from the weather, dust or vandalism. The cover is fixed to the surface with a self-adhesive strip and self-tapping screws.

Installation of a G3 gauge outdoors with the transparent cover

Detail of fixing with self-tapping screws

Reading through the transparent cover

2- Protection with the aluminium cover
For “high protection” covers, we offer aluminium boxes measuring 175 X 80 X 57 mm deep.

How to read the G3 gauge?

The reading is taken using the vernier principle, to 1/10th of a mm. Note the letter of the face read, A or B, in order to compare measurements with the same face over time.

a) Reading the mm:

The millimetre division of the graduation located to the left of the ꓕ indicates the measurement as a whole number of mm. In the example, the reading is therefore: 12 mm.

b) Reading the decimal:

Look for a line on the vernier that coincides with a line on the measuring scale.

This vernier line indicates the figure corresponding to the 1/10th of a mm. In the example, the reading is therefore: 4/10th of a mm

So the measurement corresponds to 12.4 mm

Due to the construction of the gauge, for geometric reasons, the evolution of the misalignment is equal to 2 times the difference between the 2 measurements taken.
∆h in mm = (M2 – M1) x 2
Example:
– Measurement 1 = 21.3 mm taken on 12/01/2022
– Measurement 2 = 21.6 mm taken on 24/04/2022
– Evolution of the misalignment = (21.6 – 21.3) x 2 = 0.3 x 2 = 0.6 mm

Recording kit

We offer an add-on recording kit to be mounted on the G3 gauge. This kit makes it possible to graphically record the maximum and minimum deformations of the structure.

More information on the G3 recording kit product page.

Download the Saugnac.app application to monitor your G3 gauge measurements

The Saugnac web application, completely free with no limitations, is available on PC or smartphone at https://saugnac.app. Each G3 gauge has a unique QR code and ID to associate the measurements with the gauge. This application allows you to:

– identify each gauge and its measurements with the unique QR code on the G3 gauge
– record the measurements in your account
– calculate the evolution of the misalignment
– retrieve the temperature and humidity level thanks to geolocation
– collaborate with several people on the same gauge
– manage alert thresholds
– sort the gauges by location and locate them on a map
– download the data in Excel format
– automatically display graphs
– share the data with others without an account
– access the application from your PC or smartphone
– add measurements without a connection in offline mode

Find all the explanations on how the application works