© Linetop Ltd 2021
ANATOMY OF VISITOR COUNTERS
Linetop visitor counters designed for the outdoors usually consist of a people or vehicle sensor and a data logger. The logger box cointains batteries and the removeable flash memory cube. The whole lot is housed inside an outer protective container like a Pelicase buried out of sight nearby. The sensor element is often a few metres from the Pelicase and so is on a feeder cable. The banner photo above shows a magnetometer sensor buried in the middle of a dirt road leading to a forest car park while the logger is inside a locked metal pillar in the road verge: both are connected by an underground cable running inside a shallow trench. The white circle shows the capture range of the sensor in this particular example as its sensitivity is adjustable to suit the road.Outdoors counter with external sensor
Our next example is a kissing gate at a dry stone wall at the edge of a minor public road. A site recce was done, then with proper
planning, a special pre-drilled stone was prepared in advance at our workshop to hold and position the body-heat sensor element
in the stone wall. This rock was positioned at the back of the enclosed gate area inside the wall, aiming at the hands and mid-line
of visitors. Its feeder cable passes though the wall inside flexible plastic conduit into the Pelicase hiding place which is lined with
a recycled plastic frame to keep it clean and repel damp. The data logger and sensor driver are housed inside the Pelicase.
Outdoors counter with an internal sensor
The tube-shaped grey plastic body-heat sensor piece is clamped within a hole drilled in a secure metal box which itself is clamped to a street sign with stainless U-bolts. The diameter of the upright pipe was measured in advance so the correct size of U-bolts could be purchased, and the box was painted, all in advance. Thus the installation work in the street took only a few minutes. Break-beam counter indoors Typical Linetop counters place two boxes either side of a door that opens away from them. Fixing this is very quick with rawlplugs and screws. It does need planning to decide which side will be the receiver/logger and which is the transmitter as this determines which face of the box is used for the infra-red beam optics. Body-heat sensors in a single box are sometimes fixed on lintels of narrow doorways looking downwards: in these cases it is the visitor who emits the thermal radiation that is being detected.
VISITOR COUNTERS
