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Installation and commissioning
February 2023
Figure 4-24: Trigger wheel with rectangular tooth profile
A. Eddy current sensor PR 642x
B. Tooth tip
C. Tooth base
The following sections describe the mechanical requirements for trigger wheels with
rectangular tooth profiles.
Tooth depth
Chose the tooth depth of the trigger wheel so that the sensor does not detect the ground
of the gap between the teeth. This results in higher signal amplitudes and consequently in
a better signal-noise ratio (see also
machine). For this reason, the tooth depth should be greater than the measuring range of
the sensor. Suppose approximately twice the sensor measuring range as a standard value
for the tooth depth. If, for example, a PR 6423 sensor at 2 mm measuring range is used,
the tooth depth should be approximately 4 mm.
Figure 4-25: Tooth depth
A. Tooth depth
Width of trigger wheel
The width of the trigger wheel should be larger than D+2*X plus the expected axial
displacement (see
reduction of signal amplitudes or even to the total signal loss if the axial displacement
moves the trigger wheel out of the measuring range of the sensor.
distance X depending on the sensor type.
Example for the minimum width with a PR 6423 sensor and 2 mm axial displacement:
Width_of_the_wheel
54
Adjustment and arrangement of sensors at the
Figure
4-26). A smaller width of the trigger wheel may lead to the
= D+2*X+Axial_displacement
min
Operating Manual
MHM-97442
Table 4-7
below shows
MHM-97442, Rev. 2.06
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