Bently Nevada 9200 and 74712 Series
These two-wire transducers use moving-coil technology to provide a voltage output that is directly proportional to the transducer's vibration velocity. Moving-coil transducers are less sensitive to impact excitation than integrating accelerometers and can be appropriate for certain applications.
The 9200 and 74712 sensors offer convenience when taking portable measurements as neither device requires external power.