Acoustic Slab Sensor for Pedestrians
Accurate, invisible and unaffected by external interference, this is the most popular model
in the range.
slab
How does it work ?
One or more underground slabs sensitive to micro-variations in pressure are used to detect footsteps. A timer system prevents overcounting if a person steps twice on the slab.
For wide passages, the dimensions and spacing of the slabs can count people walking alongside each other, while maintaining an accuracy of ± 5%.
walkers side-by-side
To distinguish walkers side-by-side, several slabs may be placed adjoiningly to cover up to 12 m (40 ft) with 10 cm (3.8 in) separation between.
Natural or deliberated placed obstacles may also be placed between the slabs to encourage walking on the slab individually.
Applications
All ground types except rocky soil.

>Hiking trails

> Public parks and gardens

>Paved surfaces

>Towpaths and semi-urban footpaths (stabilized).All ground types except rocky soil.
Technical Characteristics
>Dimensions:

Length = 60 cm (24 in)
Width = 50 cm (20 in)
Thickness = 1.6 cm (0.6 in)

>Weight : 4.5 kg (10 lb)

>Material:
Hard plastic with silicon seal and brass junction nozzle.

>Battery life of logger : 10 years
Acoustic slab
Settings
The sensitivity and timer are set in the factory. For specific cases, settings may be modified on site with the PDA.
Minimum sensitivity
A 10kg (22lb) child.
Installation
Depending on the ground type, installation should take between 30 minutes to one hour per slab.
Ground preparation
Dig hole for slab 5 to 10cm (2 to 4 in.) deep. After placing the slab, cover with previous material, making sure that sharp rocks are not touching slab or tube.
Each system includes
Slab(s), transducer(s), tube(s) 4 meters (15 ft) of cable with a waterproof plug and an Eco-Pilot or Eco-Twin logger.
Additional Products
>Asphalt kit: An asphalt-like special mix that retains the flexibility essential for counting

>Honeycomb matrix: glued to the slab for additional erosion protection

>Floating slab: a joint is glued to the slab to allow installation under concrete and to retain flexibility
Number of slabs needed to cover a wide passage
One slab is 50 cm (20 in) wide. When installing several slabs, leave a space of 10 cm (4 in).Up to 15 cm (6 in) may be left at both ends of the trail. Therefore, one slab will cover between 50 and 80 cm (20 and 32 in). A natural obstacle such as a rock may be used to separate two slabs.
Installation Exemples
installation slab rustic fencing barrier pedestrian
Use of rustic fencing
Barrier for cars with pedestrian passage
installation example slab using natural shifted obstacles or geographic features
Use geographic features to narrow
Use of natural or shifted obstacles
Photos of installation
Duration
Depending on the ground type, installation should take 30 minutes to one hour per slab.

Ground preparation
Dig hole for slab 5 to 10cm (2 to 4 in.) deep. After placing the slab, cover with previous material, making sure that sharp rocks are not touching slab or tube.
installation slab installation four slabs
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Summary