KELUNJI GECKO SMA-HRStrong Motion Accelerograph (High Resolution)

• 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

• Continuous recording• Triggering (Level & Average)• LCD & keypad setup - no laptop required• Single central bolt for easy alignment• Install and setup in just minutes

FEATURES• Designed for Structural Health Monitoring of Buildings, Dams, Bridges, or any asset vulnerable to earthquakes

• 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 CENTRE141 PALMER STREET, RICHMONDVICTORIA 3121 AUSTRALIA T: +61 3 8420 8940 SRC.COM.AU

2015 DPWH GUIDELINE COMPLIANT

RECORDER

GECKO SMA-HR TECHNICAL SPECIFICATIONS

ACCELEROMETER

Sensor type:

Full scale range:

Frequency response:

Self noise:

Triaxial Force Feedback

±2g

DC-100Hz

<1µg (DC-100Hz)

DPWH guideline requirementAccelerograph• 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 67Recording• 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 bitsTiming• Interval: Half a second or less• Accuracy: Plus or minus 0.2 second per 100 seconds• Type : GPS or NTP ServerTriggering• 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 chargerCommunication• Ethernet: 10 base –T or 100 base-TX• Protocol: TCP/IP FTP/SFTP

Kelunji Gecko SMA-HR complianceAccelerograph• 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 ingressionRecording• 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 bitsTiming• Data storage interval at 100sps is less than 0.5 seconds• Time accuracy: 0.00001 seconds, synchronised every second• GPS used for timing and positionTriggering• 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

activationPower• Battery maintained by AC chargerCommunication• Ethernet adaptor and cellular network modems available• TCP/IP used for data telemetry over Ethernet/cellular

Compliance to 2015 DPWH guidelines on earthquake monitoring instrumentation for buildings

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