Preview Preco Standard PreView Guide d'installation Page 3

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Preco Electronics, Inc. 415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2003 Page 3 of 10
370-894-1B
Table 1. Operator Display Description
Object Detection Capability
The Standard PreView
tm
system can detect most objects within the detection zone. However,
there are some instances where objects can go undetected. Obstacle size, shape, and
composition are all factors determining if, when and where an object is detected. The PreView
tm
system operates by transmitting a pulse of very low power electromagnetic energy. Any
energy that strikes an object reflects a certain amount of this energy back to the PreView
tm
sensor. This returned energy is measured to determine an object’s distance.
The amount of energy returned is based on a few factors:
Size – a larger object usually reflects more energy than a smaller object.
Distance – the farther away an object is, the less energy is returned.
Composition – a metal object reflects more energy than a non-metallic object. A
metallic object at the edge of the zone will be detected, where a wood object may not.
Scattering – a solid object reflects more energy that a non-solid object such as wood,
gravel, bushes, etc.
Angle – an object perpendicular to the sensor will reflect more energy than an object at
an angle. See below for a detailed explanation.
Figure 1. Object Reflection
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