Seismic Protection & Recording Equipment

PRA-103 Peak Response Accelerometer

The PRA-103 is a robust, self-contained peak response accelerometer engineered for reliable detection of low-frequency vibration events such as seismic activity, strong winds, blasting, and pile driving. Designed for long-term deployment in critical infrastructure, it provides a permanent, tamper-resistant mechanical record of peak acceleration without requiring external power—making it an ideal backup or standalone monitoring solution in demanding environments.

⦿ No external power required for fully autonomous operation
⦿ Compact, rugged construction for long-term reliability in harsh conditions
⦿ Tri-axial measurement across X, Y, and Z axes
⦿ Multiple full-scale ranges: ±0.5 g, ±1 g, ±2 g, or ±5 g
⦿ Standard and high-temperature variants available
⦿ Qualified to IEEE 344 for nuclear power applications
⦿ High-visibility, easy-to-read output for straightforward peak measurement

SP Piezoelectric & VEL/GLF
Seismic Sensors

A range of seismic sensors providing acceleration or
velocity detection at low frequencies

⦿ SP4/SP5, short period accelerometer, up to 10V/g
Response from 0.1Hz – 100Hz with 120dB dynamic range

⦿ Self-test facility through signal injection

⦿ Strong motion seismic acceleration measurements

⦿ VEL/G, Self Generating, 20mV/mm/s
Response from 0.5Hz – 1kHz with 120dB dynamic range

⦿ Peak particle velocity measurements
Various mechanical configurations and cable options