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Identification Systems - Introduction Example of a transmission curve
If code or data carriers are mounted on or near metal, the ranges are re­duced as follows (in percent compared to the maximum possible range):
60
in air /
Installat
rtn with
7 mm
/
installat on with f 11 m 11 —
distance on steel
K 1 1
1
Ins
tallation tance or
with 7 n l alumin
I I
(\
\
J/
L
J
E
-1-
Example: read curve IPH-L2-V1 with IPC03-20W
50
40
E E,
a u c re
¡3
30
20
10
0
-50 -40 -30 -20 -10 0 10 20 30 40
Mismatch [mm]
50
Designs of the read/write heads
Regarding the designs of the heads and the code/data carriers, multiple re­quirements may coincide. On the one hand, these devices are to be mount­ed on or in existing parts and possibly there are limits for the mechanical dimensions. On the other hand, you often want to achieve the longest pos­sible ranges. As the size of the heads also results in longer ranges, you need to find a suitable compromise. Both cylindrical designs which can be easily mounted in plates with drill holes as well as rectangular designs which can be easily screwed to surfaces are available.
Maximum passing speed
Certain minimum times are required for detecting the code carrier and for reading the data. In the case of large read/write heads, the time that the code carrier remains in the read range is longer. Thus, higher passing speeds can be achieved. The blue range (30 to 80% of the max. read dis­tance) indicates the safely usable read range.
IPT-FP with IPC02-50W in air
IPT-FP with IPC02-50W in air
100
N
7
1
Max
. rea
id ra
nge
x
n
\
v
j
I
\
-C
I
—1—'
100
80
80
CD O O CM lS
o o
CM
CD £Z
B
to td
60­40­20-
CD £Z
B
td
td CO CD
(fi
E S
to
co
td CO CD
o to
CD td
0
-60 -40 -20 0 20 40 60
Mismatch [mm]
-60 -40 -20 0 20 40 60
Mismatch [mm]
CD
eg o co to
CO CO
o
LO
o o
CM
Subject to reasonable modifications due to technical advances.
Copyright Pepperl+Fuchs, Printed in Germany
15
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
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