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Built-in servo type accelerometer seismic monitoring system (SW-72 / SW-72R) Item No:Built-in servo type accelerometer seismic monitoring system (SW-72 / SW-72R)

Built-in servo type accelerometer seismic monitoring system (SW-72 / SW-72R)Item No:Built-in servo type accelerometer seismic monitoring system (SW-72 / SW-72R)

Highly accurate compact seismometer built with sensor

Adopting high accuracy servo type accelerometer. SW-72R is high-end model which accepts measurement of SI value and seismic intensity.

ItemSW-72SW-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
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)
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)