ABB Busch E-contact System Manual page 59

Information about planning and application
Moving lengthways / parallel to the device
Fig. 20: Moving lengthways / parallel to the device
[A] Lengthways toward the device
[B] Parallel to the device
The detection width is physically dependent smaller when the person to be detected moves
directly toward the device or in parallel (e.g., in a corridor) with it.
In the right example graphic a new sector is touched by the person only at the end of a 1 m path
(arrow). It is only here that the person is detected by the device.
The detection of the infrared change functions best when the person to be detected moves
crosswise to the viewing field of the device. Here, for example, it crosses several sectors at a
1 m path. If the person moves directly towards the sensor, it takes longer before the person is
detected by the device in other sectors. This is called a central approach.
System Manual 2CKA001473B9577 │59