Seismic Accelerometers for
low frequency vibration measurement.
PCB Piezotronics have introduced a small sized,
low frequency, high output seismic accelerometer
to add to their current range of high sensitivity
vibration sensors.
The model 393B05 has a 10V/g sensitivity whilst having a mass
of only 50 grams. This sensor is ideally suited for seismic vibration
monitoring of semiconductor fabrication facilities, structural testing
of space structures, and low frequency low amplitude modal
analysis and vibration testing applications.
As with all the 390 seismic series, it can also be used for the
detection of ultra-low level vibrations associated with very large
structures such as bridges or buildings, as well as foundation
vibration monitoring and earth tremors.
The ceramic piezoelectric element has a flexural design, which
provides a high output with a small seismic mass, and offers a
broadband resolution down to at least 4µg rms. The element is
housed in a hermetically sealed titanium case, which is just 31mm
high and 25mm diameter. Whilst most of the range have rugged
2-pin connectors ideally suited to outdoor use, the 393B05 has
a 10-32 microdot connection.
The 10V/g output sensitivity provided by the built in ICP®
electronics, allows measurements up to ±0.5g with a ±5V
full-scale output, over a frequency range of 0.6 to 650 Hz (±5%).
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January 2003
