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Planning and
Installation Guidelines
V 6
Technical Description
4.2 Primary loop sizes and current values
The feeding to the primary loops should be max. 5m (twisted part of the primary loop cable).
Too high current values, particularly with several turns, may lead to not allowed high field
strength for humans, especially pace maker carriers.
Wireless Proximity Switches / Issue: 09.2004
Primary loops which are connected to the same primary supply, should have the same
side-length.
The current value which has to be chosen for the power supply is defined by the short side of a
primary loop, in very small setups additionally by the number of turns (1 or 2).
The values are listed in the following table.
1000
1-2
1200
1-2
2
1400
1-2
1
2
1600
1
2
1800
1
2
2000
2
1-2
2200
2
1-2
2400
2
1-2
2600
2
1-2
2800
1-2
3000
1-2
3100 -
1-2
4500
4500 -
1
6000
Minimum distance for
pacemaker carriers [mm]
Table: Dependence of primary loop size, turns and current value to be set.
Short side of the primary loop [mm]
Current value [A]
2
4
2
4
5
1
8 10
2
4
2
5
6
1
8 10 12
2
4
5
6
6
1
8 10 12 13
2
4
5
6
6
7
1
8 10 12 13 15
1
8 10 12 13
1
15 16
1
8 10 12 13
1
15 16 18
1
8 10 12
1
13 15 16 18 20
1
8 10
1
12 13 15 16 18 20 22
1
10 12 13 15 16 18 20 22 24
1
8 10 12 13 15 16 18 20 22 24 24
1
8 10 12 13 15 16 18 20 22 24 24
1
8 10 12 13 15 16 18 20 22 24 24
Planning and Installation Guidelines
43
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