Japan, Naigai Rubber Industry Co.,Ltd
Naigai Earthquake Detector
Made in Japan
Manufacturer: Naigai Rubber Industry Co.,Ltd
When seismic motion (P wave or S wave) exceeding a set acceleration (gal) is detected, it automatically activates and turns on the electric circuit.It can be used in combination with control circuits for elevators, general equipment, commercial equipment, etc. to automatically operate during an earthquake. This is a device that is activated to control equipment operation/stopping, alarms, etc.
Features
- Earthquake detection by microcomputer reduces malfunctions
- Built-in battery supports even during power outages
- Reset and operation confirmation can be controlled remotely using contact signals.
- Setting acceleration can be set to any three levels
Operating principle
This product uses 3-axis capacitance acceleration sensor for the acceleration sensor section, and is also composed of a microprocessor section, output section, power supply section, display section, and operation switch section. The signal sent from the acceleration sensor is captured by the microprocessor, passes through a filter that limits it to the seismic frequency band, compares it with a preset detection level, and drives the relay contact.
– P wave detection type, S wave detection type
– P and S waves simultaneous detection type
– Waterproof P wave detection type
Use for elevators
Our earthquake detectors interlock with the control circuit of an elevator to ensure the safety of users in the event of an earthquake.
They detect P waves (minor initial tremors) that come first in the event of an earthquake. When the earthquake detector receives control signals from the sensor, it stops the elevator on the nearest floor if the elevator is moving. Also, it lets the occupants evacuate from the elevator before the S waves (main tremors) arrive. After that, it can maintain an off-service state (for a set time) or cancel it according to the detected S waves and the acceleration (earthquake intensity) preset in the detector. This operation can prevent secondary accidents caused by people using elevators after an earthquake. The Ministry of Land, Infrastructure, Transport and Tourism mandated the installation of such detection systems in new elevators. This ministry has been strengthening the guidance on existing elevators too.
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