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SW-52EX / SW-52ST can provide alarm outputs for control in the event of an earthquake on gas and dust explosion areas such as petrochemical or hydrogen plants, manufacturing plants, etc. High resolution servo accelerometer enables to prevent secondary disasters caused by earthquakes.
| 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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