Allen-Bradley 1442 User Manual page 16

Eddy current probe system
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Chapter 1
Installation
16
The characteristics of output (V) and gap (mm) are as shown in the graph below.
Speed Measurements
Assumes measurements are made with a 5 mm or 8 mm probe.
Figure 2 - Dimension of target (recommended for rotational speed measurement):
B
D
A
C
Recommended dimension of
target (mm)
Recommended set gap (mm)
Rockwell Automation Publication ICM-UM004C-EN-E - February 2014
A
D
D
C
mm
A ≥ 6
B ≥ 7
C ≥ 2.5
D ≥ 15
1.0...1.5
B
C
mils
A ≥ 236
B ≥ 275
C ≥ 98
D ≥ 590
39...59

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