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Seismometers
Seismic monitoring system with display (SW-54 & SW-52)
- A popular seismometer with display
- SW-54 uses high resolution servo accelerometer which can detect micro earthquakes.
Features (SW-54)
Features
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- ■ Indication function
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Importance level of information is shown by back color. It can be recognized even by remote watching. On earthquake ocurrence, “ocurrence time”, “peak acceleration”, “seismic intensity scale (measured seismic intensity)” are displayed.
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- ■ Memory function
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Up to 50 time histories can be saved.
*Option software is needed to export waveform data.
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- ■ Alarm setting
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3-step alarm output by acceleration is possible. Alarm level is possible to be set.
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- ■ Easy to operate
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Touch panel is adopted. Easy operation makes speedy confirmation in an emergency.
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- ■ Alarm setting
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Compact size makes easy installation. It can be stored in a rack.
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- ■ Waveform observation
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By connecting with PC on which the option software is installed, various settings of the device and seismic waveform data stored in the internal memory can be acquired.
Features (SW-52)
Features
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- ■ Reliable accuracy
Built - in servo type accelerometer is also used for detection of micro-tremor. Both indication setting and alarm setting is 1 gal step.
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- ■ Waterproof structure
It is ideal to install the seismometer on the common foundation to catch the motion of earthquake correctly. SW-72/72R adopts waterproof structure equivalent to IP67’s which is able to be installed outside or dusty environments.
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- ■ Available to large-scale earthquake monitoring
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The peak of motion in any direction can be surely captured by vector composition of the accelerations detected by the accelerometers arranged in three directions. The measurable acceleration range up to 5000 gal prepare against the large-scale earthquake.
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- ■ Easy installation
For the conventional seismometers, 4 points are requested to be fixed by anchor bolts. SW-72 or SW-72R has two cut-out holes for fixing bolts so that bolt position adjustment can be easier.
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- ■ Compact design
In addition to the compact size, the cable port is located at the lower part and outer round shape to be surrond friendly.
Block Diagram
Block Diagram
Outward dimensions
Outward dimensions
Specifications
Specifications Processing Unit (SW-54)
| Item | Specification | |
|---|---|---|
| Display element | STN monochrome LCD with touch switch/back light color: green/orange/red | |
| Display contents | Earthquake monitor display | Present time |
| Earthquake generation display | Earthquake generation time, maximum acceleration, seismic intensity scale, alarm operation |
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| Alarm hold display | Above + reset button (whole reset of alarm/buzzer) | |
| Setting display | Trigger, alarm, date and time | |
| Maintenance display | Pickup test, earthquake history | |
| Alarm and buzzer | Upper limit 3-step (ALM1‒3), individual setting, buzzer for point, Alarm setting value: 0.1 to 999.9 (gal/seismic intensity scale/Kine) Setting interval: 0.1 step,0.0 is alarm operation OFF (seismic intensity scale alarm is set byinstrumental seisimic intensity value） |
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| Extra alarm | Alarm step | Upper limit 7-step (ALM4‒10), individual setting (acceleration/seismic intensity scale/SI value/any setting is possible) |
| Alarm setting value | 0.1 ‒ 999.9 (gal/seismic intensity scale/Kine) setting interval 0.1 step, 0.0 is alarm operation OFF (seismic intensity scale alarm is set by instrumental seismic intensity value) |
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| Alarm contact | 1a contact (photo MOS relay) independent COM 2-point (ALM1‒5, ALM 6‒10, each 1-point) |
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| Contact rating | 200 V – 0.65 A (AC/DC, peak value | |
| Alarm and buzzer 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 non-voltage [a] contact) c. Reset button on the touch panel (effective on display alarm) |
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| FAULT alarm | (Power failure) 1a/1b contact switching type Contact rating: 2 A 30 VDC (maximum allowable voltage/current: 220 VDC/2 A) |
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| Serial output | For maintenance (conforms to RS232C ) : MC1 (switch over) For external display (conforms to RS422) : MC2 For printer (conforms to RS232C) : MC2 |
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| Back up unit | Backup time › 10 min. (ready time), charging time ‹ 48 hours (no function at the operation by optional power 24 VDC ) |
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| Mounting method | Wall hanging | |
| Operating temperature range | 0 to + 50 °C | |
| Operating humidity range | 10 to 85%RH (non-condensing) | |
| Power supply | DC24 V ±10%, less than 70 W | |
| Mass | Approx. 3 kg | |
Specifications Measurement unit (SW-52)
| Item | Specification | |
|---|---|---|
| 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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| 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 |
| Alarm setting Level | 0.1–999.9 gal *1 setting interval 0.1 step, 0.0 is alarm operation OFF |
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| 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） |
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| Serial I/F | Communication with SW-54 (conforms to RS422) /For maintenance (conforms to RS232C) |
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| Clock | Accuracy | ‹ 70 ppm (daily error of 6 seconds) |
| Time calibration | ±30 sec. correction (external input of no-voltage a contact) | |
| Operating temperature range | 0 to + 50 °C | |
| Operating humidity range | 10 to 100 %RH (non-condensing) | |
| Power supply | DC24 V ± 10% less than 10 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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*1 Initial setting values are 80, 250, 400 gal
*2 When connected with SW-54 , power is supplied from SW-54
Option
Option
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■ External display (ED74)
Indicates acceleration amplitude, seismic intensity
scale and alarm occurence time. -
■ Multiple control unit (2 out of 3) CU-5
This device makes reliability of the relay contact output of
the alarm signal to control or stop activation higher.
An alarm signal is output when 2 units out of 3 generate
alarm signals. -
■ Seismometer detector protection housing (SW-72-PC-SUS)
Protect seismometer from shock or dust.