
CP3 version 3003
71
Sensor Installation (DPO)
The vertical sensor must be installed pointing directly to a hard and straight surface. It must be mounted on
the ceiling over the driving
l
ane no more than 2.5
m above the floor and pointing directly towards the floor.
The angle of the sensor must have a vertical deviation of m/-2-degrees. Sensors must be installed
at all entrances and exits to provide a correct counting.
The sensor sends out a 40 kHz ultrasonic signal, and it is important that the receiver inside the sensor is
able to detect the returning signal without problems. If the angle is awkward or the surface of poor quality,
the signal might be interrupted resulting in the sensor's flashing red or even miscounting.
Various possibilities of installation of one and two sensors at exits and entrances will be described in the
below sections.
Two-sensor DPO
The two-sensor option is probably the most common installation. This solution makes it possible to use the
same lane as entrance and exit, even if the cars are going the wrong way. Installations often consist of
independent entrances and exits as shown below.
A two-sensor solution could look like this: