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| | | The SA series of seismic safety switches are fundamentally triaxial vibration detection devices, suitable for the protection of vulnerable structures from ground borne vibration events. The unit features three high sensitivity low noise seismometers in combination with high integrity alarm circuitry mounted in a robust weatherproof steel enclosure. The series are seismically qualified and feature an optional 2 out of 3 voting system. When the vibration signal on any axis exceeds the set alarm threshold, the seismic alarm relays are activated, permitting further alarm processing for the safe shutdown of equipment.The switch can also be configured to provide a robust current loop output for each of the three axes of detection representing the measured seismic waveforms. | | |
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| | | Utilising the SP4 seismic transducer permits full in-service testing and performance verification. | | |
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| | | | | | | | | | | • | Measurement Range | 0.1 Hz to 100Hz | | | | • | Actuating Sensitivity | 0.005g to 0.5g | | | | • | Dynamic Range | 90dB | | | | • | Sensors | Triaxial SP4 | | | | • | Power Supply | 230Vac, MOVac or 24Vdc | | | | • | Protection | IP66, Optional Weather Shield Available | | | | • | Calibration | Internal or External Oscillator, 20Vpk-pk, 1 Hz Std | | | | • | Alarm Interface | Seismic Event Relay,Transducer Integrity Relay Contact Rating 220V AC/DC at 2A | | | | • | Seismic Qualification | IEEE Std 344-1987 | | | | • | EMC Approval | EN6I326 (Heavy Industrial Standard) and Def Stan 59-41 | | | | • | Applications | Nuclear Power plants, Oil Exploration & Mines, Large Structural Monitoring | | | | | | | | | | |
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| | | p^^l Xlor Y1 or 21 | | |
| | | Seismic Switch 1 | | |
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| | | 0 | | |
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| | | 2 out of 3 Voting | | |
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| | | jr^^Yl X2or12 or Z2 | | |
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| | | Seismic Switch 2 | | |
| | | 0 | | |
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| | | Trip Test ft Calibration | | |
| | | ^ X3orY3orZ3 | | |
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| | | Seismic Switch 3 | | |
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| | | 0 | | |
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| | | Seismometer | | |
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| | | Typical Seismic Switch Voting Alarm System | | |
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