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FAQ03270 of Contact Sensors / Liquid Leakage Sensors FAQ

FAQ No. FAQ03270

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How does the D7G-F Vibration Sensor prevent false detection of earthquakes?


The D7G-F Vibration Sensor operates with the following mechanisms.

1)When an earthquake occurs, the Sensor will detect that the vibration level has exceeded the detection vibration level.

2)If the vibration cycle is 0.1 to 2.0 s and it continues for more than 1.5 cycles, the Sensor will detect an earthquake.

3)When the acceleration of the vibration exceeds the set value, the Sensor concludes that there is an earthquake and the Vibration Sensor operates.

Even if the acceleration reaches the set value, if the vibration cycle is not within the range, the Sensor will conclude that there is no earthquake, thus preventing a false detection.

In locations where vibrations or waves similar to seismic waves (false vibrations) occur, it may operate. Check whether there are false detections when selecting a location to use the Sensor.

Test the planned installation location by installing the D7G-F for 1 to 2 days and seeing if the operation indicator lights, or the display goes above 100 gal. If either of these happens, vibrations similar to earthquakes are probably being detected in that area, so change the installation location.