Seismic monitoring system with display (SW-54 & SW-52)

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)


  • ■ Indication function

    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.

    Indication function

  • ■ Memory function

    Memory function

    Up to 50 time histories can be saved.
    *Option software is needed to export waveform data.

  • ■ Alarm setting

    Alarm setting

    3-step alarm output by acceleration is possible. Alarm level is possible to be set.

  • ■ Easy to operate

    Easy to operate

    Touch panel is adopted. Easy operation makes speedy confirmation in an emergency.

  • ■ Alarm setting

    Compact size makes easy installation. It can be stored in a rack.

  • ■ Waveform observation

    Waveform observation

    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)


  • ■ Reliable accuracy
    Reliable accuracyBuilt - in servo type accelerometer is also used for detection of micro-tremor. Both indication setting and alarm setting is 1 gal step.
  • ■ Waterproof structure
    Waterproof structureIt 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.
  • ■ Available to large-scale earthquake monitoring

    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.

    Available to large-scale earthquake monitoring

  • ■ Easy installation
    Easy installationFor 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.
  • ■ Compact design
    Compact designIn 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

Block Diagram

Outward dimensions

Outward dimensions

Outward Drawing


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
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)
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)
Alarm contact 1a contact (photo MOS relay)
independent COM 2-point (ALM1‒5, ALM 6‒10, each 1-point)
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)
FAULT alarm (Power failure) 1a/1b contact switching type
Contact rating: 2 A 30 VDC (maximum allowable voltage/current: 220 VDC/2 A)
Serial output For maintenance (conforms to RS232C ) : MC1 (switch over)
For external display (conforms to RS422) : MC2
For printer (conforms to RS232C) : MC2
Back up unit Backup time › 10 min. (ready time), charging time ‹ 48 hours
(no function at the operation by optional power 24 VDC )
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
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
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)
DC output DC4 – 20 mA, load resistance < 300 Ω
Full scale: 10 to 3000 gal (setting interval: 1 gal)
Serial I/F Communication with SW-54
(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)
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)

*1 Initial setting values are 80, 250, 400 gal
*2 When connected with SW-54 , power is supplied from SW-54



  • ■ External display (ED74)

    External display (ED74)

    Indicates acceleration amplitude, seismic intensity
    scale and alarm occurence time.

  • ■ Multiple control unit (2 out of 3) CU-5

    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)

    Seismometer detector protection housing (SW-72-PC-SUS)

    Protect seismometer from shock or dust.