Application Notes
1
Direct contact between the transducer and the metal surface is
important; therefore, where possible, dust, residue and paint
should be removed prior to use.
2
For validating an installation, the transducer should be used to
inject a signal in the vicinity of the acoustic emission sensor being
tested.
3
When injecting a signal into a surface, ensure there is a direct
transmittance path between the acoustic emission sensor and
acoustic emission transducer – there should be no cracks/joints/
nuts/bolts/holes interrupting the path.
Signal injection sites
1
2
3
CMAC 2504 recommended
injection sites
Acoustic emission
sensor
Outer ring
Inner ring
Bearing seal
4
It is recommended that each acoustic emission sensor installation
be validated by injecting a signal using the CMAC 2504 device at
the following locations:
• If the acoustic emission sensors are mounted on the inner ring,
then:
–
Immediately adjacent to the acoustic emission sensor in an axial
direction into the inner ring.
–
At a position 90° along the inner ring in an axial direction.
–
At a position 180° along the inner ring in an axial direction.
• If the acoustic emission sensors are mounted on the outer ring,
then use similar locations, but on the outer ring of the bearing,
that is:
–
Immediately adjacent to the acoustic emission sensor in an axial
direction into the outer ring.
–
At a position 90° along the outer ring in an axial direction.
–
At a position 180° along the outer ring in an axial direction.
4
