Installation Manual

Versus Technology, Inc.
DT10000-A0001 9 Revision 8 December 1998
NOTE: *** Collectors may be affected by high watt radio or paging antennas.***
DO NOT PLACE A COLLECTOR IN CLOSE PROXIMITY TO ONE OF
THESE ANTENNAS
Internal Concentrator VER-2020
Note: If you are not using an Ethernet or Arcnet external
concentrator and your site is less that 150 sensors then you
may choose to use an Internal Concentrator (a plug-in PC
card) instead.
3.5 Sensor Location Planning
Perhaps the most important step in an installation involves
planning the sensor locations. A complete understanding
of sensors and tags is necessary to design an effective system.
Experience will prove to be invaluable in effective system design.
(Sensor S/N VER-4422 also available with white cover.) See
Section 7 for the sensor to punch-down wiring table. This is a
helpful example of proper sensor wiring planning and location
techniques.
IR Sensor VER-4422 white
VER-4420 black
RF Sensor VER-4450 –white only
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: 1) This device may not cause harmful
interference, and 2) this device must accept any interference received,
including interference that may cause undesired operation
3.6 Understanding High Frequency Sensor "Field-of-View"
The basic sensor "sees" the environment under it in a largely predictable pattern. However, there are other
factors that can affect the way a sensor sees. The sensor is like an eye, which is sensitive only to a narrow
spectrum of light, and the ID tag appears as a bright splash in an otherwise dark world to the sensor. Even if the
tag is blocked from the view of a sensor, it can often be detected. Though the infrared light from a tag does not
penetrate solid objects or bend around corners, it does reflect from surfaces in the room. This can sometimes be
mistaken for "seeing around corners." The effect of reflection can be used to advantage by the clever system
designer, but can also pose problems for the unwary installers. The area that a sensor can see in a given
situation is referred to as the sensors "field of view." Sensors are specified to have a given field of view when
obstacles are not present, so actual installed field of view may differ.
If a sensor is placed in a room with obstacles and reflections eliminated, the field of view of the sensor appears
in the shape of six overlapping lobes forming a 16-foot radius. Lower ceilings reduce the effective sensor
pattern diameter considerably due to angles involved.