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G5 Gauge - Measures the change in inclination or in a distortion
Made in France

Table of contents


> Detailed description of G5 gauge

The purpose of the G5 type gauge is to measure variation in an inclination or distortion.

This G5 Saugnac Gauge is based on the same two concepts:
  • Measurements are made using a vernier measuring to 1/10th of a mm.

  • It can be fixed in place using double-sided self-adhesive tabs or mechanical means (studs and nuts)



This gauge is transparent to be inconspicuous (in polymethyl methacrylate) and measures 100 X 270 mm. It is 20 mm deep, weighs 390 g, and is accurate to 1/10th of a mm, i.e. angular precision of more or less 0.5 mm per metre.

The gauge's sensitivity period is 2 min, which means that the needle stabilises 2 min. after having been pushed to its maximum out of vertical alignment.

A screw (V) locks the needle to protect the device during transport.

It is preferable to fix the G5 gauge by mechanical means, screws or studs and nuts, through the 2 oblong holes. These oblong holes (6 X 25 mm) are located at the top and bottom of the gauge, centred on its main axis and perpendicular to it.

> Reading


Reading: 306
Place yourself perfectly opposite the needle, with your eyes at the level of the dial to avoid any parallax.

Take the reading according to the vernier principle.

Observation
When you return to the site, read the position of the needle. The difference between two consecutive readings, MULTIPLIED by 5 gives the variation in mm, per metre height.

> Installing


Rear locking screw (V)





We advise to fix the gauge mechanically using protective washers (all the items necessary are supplied)














A spirit level is provided in the case with the G5 gauge so that it can be correctly positioned, particularly in the vertical plane.

    A/ Fixing with plugs and screws


Use the screws etc supplied with the G5 gauge. Plugs of size 7/30 type S7 + stainless steel screws TR 5 X 40 with neoprene washer 17X5 + stainless steel washers.


    B/ Fixing with studs and nuts

This method in deep attachment is recommanded for all sorts of suspect or damp surface, where reliability and permanence are required. The screws etc can be supplied if requested when ordering.

> Protection

We advise protecting the G5 gauge, particularly if it has to be exposed for several months to the weather.

    A/ Protection with a plastic cover

The G5 gauge can be supplied with a transparent plastic, thermoformed, ventilated cover. Dimensions of the cover 39 X 17 X 5 cm

Plastic cover fixed with self-adhesive strips
We advise using this protection on exposed sites. The plastic cover can be fixed using self-adhesive strips and/or with plugs and screws. Readings can be taken through the cover.



Detail of fixing with plugs and screws >




Plastic cover: view from below

Plastic cover fixed with plugs and screws


    B/ Protection with an aluminium cover

In very exposed sites and/or for observation over a long period of time, we advise using protective covers in aluminium (index of protection IP65).

Dimensions of the cover: 360 X 120 X 80 mm.
Thickness 4.5mm.

The cover for the G5 gauge is fixed using studs, nuts and washers. The covers can be sealed with lead seals for security.
Installation of G5 gauges in security sealed aluminium covers on the light house at Toulon (period of observation: 5 years).


> Fixing the G5 gauge with an angle bar

Example: Measuring the change in inclination of a retaining wall.

(1) Retaining wall
(2) Infill
(3) Direction of tilt
(4) Gauge G5
(5) Installation angle bar

The G5 gauge which could not be fixed to the cross-section of the retaining wall has to be fixed using 2 angle bars on its forward surface.

The G5 gauge is fixed with bolts onto 2 angle bars firmly attached to the structure.


Lower attachment

Upper attachment


> G5 gauge on the arena in Barcelona

During underpinning work SOCOTEC Barcelona monitored the stability of the
structure.

The G5 gauge, firmly attached to the structure, is housed in a box with a transparent window.



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