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ANT PLI
KELUNJI GECKO SMA-HR Strong Motion Accelerograph (High Resolution)
• Ultra-low-noise accelerometer (<1µg DC-100Hz) for determination of natural period of structure and low frequency spectral response • Perfect for rapid deployment of aftershock monitoring networks SEISMOLOGY RESEARCH CENTRE 141 PALMER STREET, RICHMOND VICTORIA 3121 AUSTRALIA T: +61 3 8420 8940 SRC.COM.AU
E COM LIN
• Designed for Structural Health Monitoring of Buildings, Dams, Bridges, or any asset vulnerable to earthquakes
H GUIDE
15 DPW 20
FEATURES • • • • •
32-bit ADC with >130dB range ±2g full scale (±4g optional) 100Hz response (200Hz optional) 16GB SD card data storage GPS for perfect time synchronisation
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Continuous recording Triggering (Level & Average) LCD & keypad setup - no laptop required Single central bolt for easy alignment Install and setup in just minutes
GECKO SMA-HR TECHNICAL SPECIFICATIONS RECORDER
ACCELEROMETER Sensor type: Full scale range: Frequency response: Self noise:
Triaxial Force Feedback ±2g DC-100Hz <1µg (DC-100Hz)
Distributed in the Philippines exclusively by:
DRILLING ADVISORY & LOGISTICS CORP. No. 6 San Agustin Street, Rosalia Compound, Culiat, Quezon City Tel. Nos.: (632) 952-0345 & (632) 454-2596 Fax No.: (632) 952-0531 Mobile No.: 0918-9003836 E-mail:
[email protected] [email protected]
DRILLING ADVISORY
Compliance to 2015 DPWH guidelines on earthquake monitoring instrumentation for buildings DPWH guideline requirement Accelerograph • Seismic qualified as tested by recognized international testing laboratory • Stores seismic activity information as gathered by the attached accelerometer • Equipped with fault detection • Provides real-time alarm information (either audio, visual or both) during an earthquake event. • Equipped with internal battery back-up power to ensure continuous operation during a power fluctuation. • Minimum design life: 10 years and should be demonstrated and certified to have a 40,000-hour (minimum) mean time between failures • Minimum of three components (vertical, longitudinal and transverse) • Natural Frequency: Above 50 Hz • Damping: Approximately 60-70 percent critical • Sensitivity: 2g • Bandwidth: DC to 100 Hz • Environment: IP 67 Recording • Sampling Frequency : Minimum of 100 samples per second • Time: From at least 20 seconds before the ground shaking begins until 30 seconds after the last triggering level motion • RMS Noise: System noise shall be less than 40µg measured over 0-30 Hz • Media :Memory Card • Continuous Recording : capable of continuous recording • AD Converter : 16 bits Timing • Interval: Half a second or less • Accuracy: Plus or minus 0.2 second per 100 seconds • Type : GPS or NTP Server Triggering • Method: Pendulum or other device using earthquake motion as an exciting force • Level: Accelerograph: 0.5 to 100 gals nominal velocitimeter: 5 μm/s to 1 mm/s • Time: Full operation of accelerograph/velocity in not over 0.1 second after activitation. Power • Battery maintained by charger Communication • Ethernet: 10 base –T or 100 base-TX • Protocol: TCP/IP FTP/SFTP
Kelunji Gecko SMA-HR compliance Accelerograph • Performance tested by University of Technology Sydney, University of Melbourne, CE certified • Records triaxial data from integrated accelerometer continuously to SD card storage • Fault detection - SD card full/error, power, temperature • Real-time alarm output to relay circuit during earthquake can be connected to audio/visual device • Internal battery available (large battery pack in SMA enclosure recommended for serviceability and testing) • Designed for minimum 10 year operation. Kelunji SMAs used in structural monitoring have operated for over 20 years, producing an aggregate MTBF of greater than 5 years • Three orthogonally aligned accelerometer components (vertical, longitudinal and transverse; East, North, Up) • Lowest spurious resonance >450Hz • Force feedback sensors have critical damping (100%) • Sensitivity is 5V/g with ±10V range, giving ±2g range • Bandwidth is DC to 100 Hz • Compliant with IP67 for dust and water ingression Recording • Sampling rates up to 4000 samples per second available • Data is stored continuously before and after trigger time • Measured full spectrum noise is less than 1µg over 0-100 Hz (less than 0.5µg RMS noise over 0-30Hz) • Media: 16GB SD Memory Card standard • Continuous recording is always enabled • AD Converter: 32 bits Timing • Data storage interval at 100sps is less than 0.5 seconds • Time accuracy: 0.00001 seconds, synchronised every second • GPS used for timing and position Triggering • Force feedback circuit. Earthquake motion provides excitation • Level triggering for accelerograph any value from 0.2 to 1980 Gal • Full recording operation 100% of time, regardless of trigger activation Power • Battery maintained by AC charger Communication • Ethernet adaptor and cellular network modems available • TCP/IP used for data telemetry over Ethernet/cellular
