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An Innovative Seismic Switch GST-43-M is hitting the world! Earthquakes can cause severe damage, such as fires, road/bridge damages, building collapse, etc. that really threaten people’s lives. Therefore, establishing a complete earthquake warning system becomes important and urgent to prevent any further significant damage.
With advanced warning, people could take precautions against the earthquake disaster. To meet this kind of demand, ICP DAS and San Lien Technology have cooperated to develop an innovative seismic switch--- GST-43-M.
GST-43-M is an advanced seismic switch equipped with a PC/AT embedded controller inside and running Mini OS7 operation system. GST-43-M has the brilliant feature of extreme high boot-up speed in just 0.1 second and provides real-time monitoring and/or controlling functions for any emergency reactions that are needed. In addition, the built-in tri-axial MEMS accelerometers acquired vibration signal by 100Hz sampling rate and calculate the STA / LTA algorithm to achieve earthquake detection.
GST-43-M is a modern seismometer. It contains 3-axis MEMS accelerometers and a 16-bit 80 MHz CPU to process the signals and do the communication. Signals of the 3-axis accelerometers are sampled with the rate of 160 Hz. The signals are first filtered against the high-frequency noise above 20 Hz, and then used for determining the seismic events.
It can display maximum intensity according to CWB earthquake intensity standard, maximum vector, tri-axial acceleration, instant tri-axial acceleration, etc.
A special technique is applied for this unit to determine the seismic events. GST-43-M uses STA/LTA threshold levels plus a unique clamped acceleration slope method to remove high-frequency man-made seismic noises. The false alarm rate can be greatly reduced by this technique. The new trigger method is different from the traditional one by virtue of the new software processing technique. It provides the system with the real-time composite vector calculation, zero-g level self-test and compensation. It also benefits from hardware’s long data FIFO which allow the STA (Short Time Average) and LTA (Long Time Average) values to be stably processed at high-speeds. Even the weakest seismic events can be detected while preventing false triggers induced by some man-made noises.
This unit displays the magnitude of seismic intensity which is defined to have seven levels according to ground acceleration by the Central Weather Bureau in real-time. Earthquake data such as trigger time, the magnitude level, the acceleration obtained from the composite vector, and the maximum acceleration in each axis, are also available for display. The two digital outputs on this unit can be defined by users to control other devices. It can be used to notify an elevator controller to stop the elevator at nearest floor; it can be used to cut off the gas supply or electric heaters to avoid the secondary disasters while earthquakes happen.
Both the Modbus RTU and Modbus TCP protocols are provided to directly connect to a computer, a PLC or an HMI (human-machine interface). When Modbus TCP protocol is used, up to three computers or hosts are allowed to be connected simultaneously.
Two Digital Outputs are available for performing users’ control requirements. The range for triggering the DO can be set from 2 mg to the maximum measurable value. Tri-axial MEMS accelerometers provide high-precision digital acceleration values. A 16-bit CPU running at 80 MHz performs the necessary digital signal processing. Self-testing is done for automatic zero level adjustments. The STA/LTA threshold trigger algorithm is applied for seismic data recording. The composite vector acceleration value of three-axis can be obtained in real-time. This unit can record the maximum composite vector output value and its tri-axial components; it also can record the maximum accelerations for each of the three axes.
Both the Modbus RTU and Modbus TCP protocols are available for communication. The reference clock can be synchronized with those of others by the NTP function. The unit can directly connect to a PC, a PLC, or an HMI. Maximum three clients are allowed to communicate with this module at the same time through Modbus TCP protocol.