Visonic TOWER 20 AM - INSTALLER GUIDE REV Installation Instructions Manual page 10

Correct Adjustment of Detector When Installed on Flat and Sloped Surfaces
For optimum performance, the detector must be vertically adjusted so that the upper "detection beams" are directed
toward the upper part of a person moving at the far end of the protected area. The adjustment process and a
reference vertical adjustment table are provided in sections 3.4 and 3.5 of the TOWER-20 AM / TOWER-20 AM
MCW Installation Instructions. This table is suitable when the detector is mounted on a straight vertical wall
perpendicular to a horizontally flat ground only. However, in reality, the ground surface may have some inclines
which requires some corrections to be done to the vertical adjustment.
Correct Installation
Upper beams directed towards the upper part of the
moving person
Bracket Mounting
When mounting the bracket, the bracket must be positioned so that it runs parallel to the ground surface (see
examples below).
Ground surface
©VISONIC LTD. 2010 TOWER-20 AM / TOWER-20 AM MCW INSTALLATION INSTRUCTIONS ADDENDUM D-302845 (REV. 0, 9/10)
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Adjust the detector according to the vertical adjustment
scale (see section 3.4 of the Installation Instructions).
On downward sloped surfaces, you may need to
compensate for the slope by adding 1 or more steps to
the numbers provided in Table 2 of section 3.4 of the
Installation Instructions.
On upward sloped surfaces, you may need to
compensate for the slope by deducting 1 or more steps
from the numbers provided in Table 2 of section 3.4 of
the Installation Instructions.
In both examples, the detector is
mounted parallel to the ground
surface.
Flat ground
Downward sloped ground
Upward sloped ground
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