Bosch INTEGRUS Specifications download pdf (Page 14)

Bosch Security Systems B.V.

10 | System Description and Planning

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Planning an Integrus infra-red radiation system

Rectangular footprints

Determining the optimal number of infra-red radiators

required to give 100% coverage of a hall can normally only

be done by performing a site test. However, a good

estimation can be made by using ‘guaranteed rectangular

footprints’. Figures 20 and 21 show what is meant by a

rectangular footprint. As can be seen, the rectangular

footprint is smaller than the total footprint. Note that in

figure 21 the ‘offset’ X is negative because the radiator is

actually mounted beyond the horizontal point at which the

rectangular footprint starts.

Figure 20: Typical rectangular footprint for a 15° mounting angle

Figure 21: Typical rectangular footprint for a 90° mounting angle

The guaranteed rectangular footprints for various numbers

of carriers, mounting heights and mounting angles can be

found in the section ‘Guaranteed rectangular footprints’.

The height is the distance from the reception plane and not

from the floor.

Guaranteed rectangular footprints can also be calculated

with the footprint calculation tool (available on the

documentation CD-ROM). The given values are for one

radiator only, and therefore do not take into consideration

the beneficial effects of overlapping footprints. The

beneficial effects of reflections are also not included.

Generally (for systems with up to 4 carriers) if the receiver

can pick up the signal of two adjacent radiators, the

distance between these radiators can be increased

approximately by a factor 2.4 (see figure 22).

Figure 22: The effect of overlapping footprints

Planning radiators

Use the following procedure to plan the radiators:

1. Follow the recommendations in section ‘Aspects of infra-

red distribution systems’ to determine the radiator

positions.

2. Look up (in the table) or calculate (with the footprint

calculation tool) the applicable rectangular footprints.

3. Draw the rectangular footprints in the room lay-out.

4. If the receiver can pick up the signal of two adjacent

radiators in some areas, determine the overlap effect and

draw the footprint enlargement(s) in the room lay-out.

5. Check if you have sufficient coverage with the radiators

at the intended positions. If not, add additional radiators

to the room.

See figures 15, 16 and 17 for examples of a radiator lay-out.

Cabling

Signal delay differences can occur due to differences in the

cable length from the transmitter to each radiator. To

minimize the risk of black spots use equal cable length from

transmitter to radiator if possible (see figure 23).

Figure 23: Radiators with equal cable length

When radiators are loop-through connected, the cabling

between each radiator and the transmitter should be as

symmetrical as possible (see figures 24 and 25). The

differences in cable signal delays can be compensated with

the signal delay compensation switches on the radiators.

R1 R2

R3 R4

R1 R2

R3 R4

1.4 W

1.4 L

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Bosch INTEGRUS Specifications Page 14

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