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| Item | SW-72 | SW-72R | |
|---|---|---|---|
| Detecting method | Omni-directional, non-directivity detection by vector composed acceleration | ||
| Built-in pickup | Force-balance servo type accelerometer | ||
| Frequency range | 0.3 to 10 Hz ±10 % | ||
| Acceleration range |
0 to 5000 gal (3–component vector product） NS / EW direction : ± 3000 gal, UD direction : + 2000 to – 4000 gal |
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| SI value measurement |
Measurement range | – | 0.1 to 1500 Kine (3-component vector product） |
| Period range | 0.1 to 2.5 sec. ±10 ％ (natural period 0.1 sec. step, figured out 25 of 1-freedom simulation filters) | ||
| Damping | Can be set by 1 % step | ||
| Low pass filter | 30 Hz (－3 dB), 4th butterworth | ||
| A / D converter | 16 bit, 100 Hz sampling | ||
| Display | 7-segment LED, 4-digit display （xxx.x or xxxx） | ||
| Alarm | Alarm step | Upper limit 3-step （ALM1–3） individual setting | Upper limit 3-step （ALM1–3） individual setting (acceleration / seismic intensity / SI value) |
| Alarm setting Level | 0.1–999.9 gal *1 setting interval 0.1 step, 0.0 is alarm operation OFF | 0.1 to 999.9 （gal / seismic intensity / Kine) 0.1step, alarm operation is OFF at 0.0 | |
| Alarm contact | 1a contact (photo MOS relay, COM common) | ||
| Contact rating | 200 V － 0.65 A (AC / DC peak value) | ||
| Relay | Made by Panasonic PD1a type (AQY277A) | ||
| Alarm reset method |
a. Automatic reset by an internal timer 1–9999 sec. (setting interval : 1 sec., 0 is automatic reset OFF) b. External reset terminals （all steps reset by no-voltage a contact） |
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| DC output | DC4 – 20 mA, load resistance < 300 Ω Full scale : 10 to 3000 gal (setting interval : 1 gal） |
DC4 – 20 mA, load resistance <300 Ω , output content switching type (acceleration/ SI value / seismic scale by internal setting） Full scale value : settable optionally up to scale 7 |
|
| Serial I/F | Communication with SW-74 (conforms to RS422） / For maintenance (conforms to RS232C) | Communication with SW-74SI（conforms to RS422) / For maintenance (conforms to RS232C) | |
| Clock | Accuracy | < 70 ppm (daily error of 6 seconds) | |
| Time calibration | ±30 sec. correction (external input of no-voltage a contact) | ||
| Operational temperature range | 0 to + 50 °C | ||
| Operational humidity range | 10 to 100 %RH (non-condensing) | ||
| Power supply | DC24 V ± 10 % less than 10 W *2 | DC24 V ± 10 % less than 15 W *2 | |
| Structure | Waterproof (equivalent to IP67) | ||
| Material | Aluminum die-casting | ||
| Mass | Approx. 1.5 kg | ||
| Mounting method | Installation on the ground (fixed by anchor) | ||
| I / O cable | Waterproof connector One-touch lock connector (made by Nanaboshi Electric) NRW-2421PF11 （connector diameter : approx. 34.1 mm) Twisted cable with shielded （made by Fuji Electric Wire) FKEV-SB 0.3sq×10 pair (outer diameter : approx. 10.5 mm) |
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