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- Seismic monitoring system with display (SW-74)
Seismometers
Seismic monitoring system with display (SW-74)
- A popular seismometer with display
- SW-74 uses high resolution servo accelerometer which can detect micro earthquakes.

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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- ■ Power supply
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Select from AC 100 V or DC 24 V (Option)
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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.
System composition
Outward dimensions
Specifications
Item | Specification | |
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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 | |
Alarm hold display | Avobe + reset button (whole reset of alarm / buzzer) | |
Setting display | Trigger, alarm, date & time | |
Maintenance display | Pickup test, earthquake history | |
Alarm and buzzer | Upper limit 3-step (ALM1– 3), individual setting, buzzer for point, Acceleration : 0.1– 999.9 gal (setting interval : 0.1 step, 0.0 is alarm operation OFF) |
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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 : 220VDC/2A) |
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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 | |
Operational temperature range |
0 to + 50 °C | |
Operational humidity range | 0 to + 50 °C 10 to 85 %RH (non-condensing) |
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Power supply | AC 100 V ± 10 %, less than 50 VA / DC2 4 V ±10 %, less than 35 W (option) | |
Mass | Aprox. 3 kg |
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.