Earthquake detectors
for long-wave seismic motion


The “Earthquake detector” for long-wave seismic motion uses an electrostatic capacity acceleration sensor, the same as in cars, produced with semiconductor micromachining technology. This system is able to detect ground oscillation, even the longer vibration cycles (long-period seismic motion).
Long-period seismic motion is an unusual slow swaying that lasts between a few and 20 seconds. Since oil tanks and high-rise buildings etc. resonate with seismic motion, stronger swaying may cause serious damages. An “Earthquake detector” that can detect such long-period seismic motion can contribute to the prevention of earthquake damage for oil tanks, highways, railway bridges of great length, and elevators of super high-rise buildings etc.
This system will give an alarm through a buzzer or light on the display/control unit and send out a contact signal to an external device, when the long-wave SI value, occurring through arithmetic procession of seismic acceleration waveforms during earthquakes, or the acceleration value exceed the preset threshold.
Item | Specifications |
---|---|
Oscillation detection axes | 2 axes in horizontal direction |
Acceleration sensor
(capacitive) |
Measurement limits: 2000gal
Voltage sensitivity:1mV/gal Response frequency: DC ~ 30Hz (-3dB) |
Data transmission method | CAN (Controller Area Network) |
Earthquake waveform recording | 5 times the data of a 5min period. Format of recorded data: CSV format |
Date function | Internal clock: hours/minutes/seconds/month/day/year |
Input and output | Non-voltage contact signal (each 1 piece) |
Power supply | AC 100V ±10% 50/60Hz *system drive is DC12V |
Operating temperature limits | -10~50℃ |
Dimensions (not including terminal) Weight |
Sensor unit: 140x82.2x100 (WxHxD mm), approx. 1.1kg Body unit: 410x90x75 (WxHxD mm), approx. 2.2kg Display & Control Unit: 445x75x50 (WxHxD mm), approx. 1.1kg |