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> Detailed description of G1 gauges

This gauge is recommended for cracks with parallel edges. Size 140 X 40 mm, total depth 3 mm, weight 4 g, traction force in the order of 25 g. There are 3 models:


The G1 type gauge:

It is white
It is in extruded PVC
- thickness of plate = 0.7 mm
- thickness of sliding tongue = 0.5 mm

Coef. of linear expansion = 7.10-5

This is the standard gauge
It is weather-resistant

The G1.1 type gauge:

It is yellow
It is in extruded PVC
- thickness of plate = 0.5 mm
- thickness of sliding tongue = 0.5 mm

This gauge is for use inside buildings only and is for installation particularly in dry rooms.

The G1.2 type gauge:

It is transparent
It is made of lexan polycarbonate, is unobstrusive and barely visible
- thickness of plate = 0.5 mm
- thickness of sliding tongue = 0.5 mm

It is for use on quality structures:
- decorated interiors
- stone facades
It is weather-resistant
The three G1 type Saugnac Gauges are all based on the same two concepts:
  • Measurements are made using a vernier measuring to 1/10th of a mm.
  • They can be fixed in place using double-sided self-adhesive tabs.
The new gauges in the G1 family are supplied ready drilled with two ° 4 mm holes. These holes facilitate fixing by mechanical means using plugs and screws on difficult structures where self-adhesion and sticking are not possible.

> Reading the vernier

The upper section is graduated in mm from 0 to 30: this is the measurement scale. The lower section moves: this is the 1/10th mm vernier (10 divisions of the vernier correspond to 9 mm on the measurement scale).


Examples of reading
Reading a measurement with a decimal (example: gauge G1. N░3):
The pointer of the vernier is between two graduations of the measurement scale. Example: between 13 and 14.

a) Reading the millimetres:
The number of mm corresponds to the graduation to the left
of the pointer of the vernier: in this case that is 13.

b) Reading the decimal:
Find the line on the vernier which is exactly opposite a line on the measurement scale. In this example with gauge N░3, graduation 8 on the vernier is in line with graduation 21 on the measurement scale.
The decimal reading is thus 8/10th of a mm. The overall reading is therefore 138/10th of a mm. Reading: 138/10th of a mm
> Using Saugnac Gauges

Example of monitoring the variations in cracksin a construction built on clay ground
reacting to variations in water content..



After an observation period which confirmed that the cracks were opening and closing,
it was decided to carry out a draining operation and build a walkway around the periphery.
The structure stabilised within the six months following the work.

> Fixing G1 gauges with plugs and screws

We recommend gluing the gauges to the structure wherever the condition of its surface does not allow the use of self-adhesive tabs.

If gluing is also impossible, we advise fixing with plugs and screws.







Impact anchors





° 4 mm hole in the gauge





° 4 mm hole in the structure
Result of fixing with plugs and screws
We recommend that gauges used in public places -schools, shops, streets - should be protected.
The protective cover can also be fixed with plugs and screws.
> Measuring the variation in a crack in a vertical or horizontal internal angle

Use a foldable plastic angle bar delivered with the gauge or an aluminium angle bar:

The internal corner is a 90░ angle. A G1 gauge is used with a plastic angle bar:
The internal corner is irregular. A G1 gauge is used with a plastic angle bar and an attachment plate:
A G1 gauge is used in an internal vertical corner with an aluminium angle bar fixed with a plug and screw:
A G1 gauge is used on a crack on the edge of an external corner with an aluminium angle bar:
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