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| Item | Specification | |||
|---|---|---|---|---|
| Detection method | All-directional detection based on vector composition acceleration | |||
| Built-in pickup | Force-balancing servo acceleration pickup | |||
| Frequency range | 0.3 to 10 Hz ±10 % | |||
| Acceleration measurement |
Maximum range | 0 to 5000 Gal (composite value of 3-component vector) NS and EW axes : ±3000 Gal / UD axes : +2000 to -3000 Gal |
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| Frequency range | 0.3 to 10 Hz ±10 % | |||
| SI value measurement |
Maximum range | 0 to 5000 Gal (composite value of 3-component vector) Cycle : 2 seconds, 5000 Gal, Damping : 2%) | ||
| Cycle range | 0.1 to 2.5 seconds Real-time calculation of speed response spectrum at measuring acceleration through twenty-five simulation filters with 1-degree of freedom, Inherent cycle : 0.1 sec. step |
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| Damping | 2 to 30 % (Arbitrary setting in 1 % step) | |||
| Low pass filter | 30 Hz (-3 dB), 4th butterworth | |||
| A / D converter | 24 bit, 100 Hz sampling | |||
| Seismic intensity scale calculation method | Modified Mercalli intensity scale (PGA estimated value) | |||
| Analog output | 4 to 20 mA DC x 2 pcs (Load resistance : 300 Ω or less) Selection of “Acceleration”, “SI” or “MMI scale” for each output | |||
| MMI scale : Full-scale is fixed, 10-level output in 1.6 mA step | ||||
| Relay output | 1a contact (Photo-MOS relay) Contact rating : 40 V, 0.8 A (For AC and DC, peak value) Output content : “Seismic alarm” or “FAULT alarm” can be selected |
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| Digital output | Open-collector output × 3 pcs. (D-GND is common) Output rating : 30 V, 50 mA Output content : “Seismic alarm” or “FAULT alarm” can be selected. |
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| Alarm | Seismic alarm | Alarm is output when the system detects earthquake and the measured value exceeds a preset level. Upper limits of 4 levels (Digital output 1 to 3, Relay output) can be individually specified. Output factor : “Acceleration” or “SI value” can be selected Output level : 0.1 to 999.9 (Gal / Kine) 0.1 step, 0.0: Alarm is OFF Reset time: 1 to 9999 seconds, 1-sec. step 0 sec. : Auto-reset is disabled |
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| FAULT alarm | The alarm is output at detection of any of the following errors “Hardware self-diagnosis”, “Pickup self-diagnosis”, “Pickup test” or “System power failure” | |||
| Seismic alarm reset | Internal timer or digital input (Digital input setting is required) | |||
| Digital input | Open-collector or non-voltage contact input x 1 pcs. (D-GND is common.) Open voltage : Approx. 13 V (ViH: 2.4 V or more, ViL: 0.8 V or less) Input pulse width : 0.1 sec. or more Function can be changed depending on communication setting: [Seismic alarm reset / Time correction / Pickup test execution] |
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| Serial I/F | Communication with host : Measurement data collection, system setting change, status monitoring, pickup test execution, digital input function changeover Interface : RS-485 (2-wire type half-duplex communication) Communication speed : 115,200 bps Protocol : Modbus (RTU mode) |
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| Clock | Accuracy | 20 ppm (monthly error: 50 seconds) or less | ||
| Calibration | ±30 sec. correction using digital input (Digital input setting is required) | |||
| Operational temperature range | 0 to + 50 ℃ | |||
| Operating humidity range | 10 to 100 %RH (non-condensing) | |||
| Power supply | DC 24V ±10 % 10 W or less | |||
| Structure | Aluminum | |||
| Installation method | Installation on the ground (fixed by anchor) | |||
| Construction | SW-52EX | Ex db IIB+H2 T6 Gb (IECEx, ATEX), Ex d IIB+H2 T6 Gb (TIIS) Ex tb IIIC T120℃ Db (IECEx, ATEX,TIIS) |
SW-52ST | IP67 (Dustproof, watertight structure) |
| Mass | Approx. 5 kg | Approx. 2 kg | ||
| I/O cable | Cable ground (Internal terminal block connection) | Connection with waterproof connector | ||
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