3-axis accelerograph Guardian DA

triaxialMEMSfor continuous structure monitoring

Brief description
Compact, flexible accelerograph with web-based recording software for structural vibration monitoring and threshold alerting.

Main features
Uses internal flash memory for acceleration data storage and supports multiple internet connectivity methods. Operates as FTP/SFTP client and SFTP server and supports real-time transfer protocols such as SeedLink for integration with common software (e.g., SeisComP). Device management via Seismic Web Configurator (SWC) provides full configuration, status monitoring, data handling and real-time waveform display. Available with ±2g full scale and optional ±4g, ±8g. Designed for efficient performance per cost.

Optional configurations

• PoE (Power over Ethernet) power supply
• Internal battery (up to 20 h autonomy)
• Internal GNSS receiver for time synchronization

Applications

• Building vibration monitoring
• Operational modal analysis (OMA)
• Structural Health Monitoring (SHM)
• Earthquake Early Warning (EEW)

Technical specifications — Guardian DA
Sensor type: MEMS accelerometer
Axes: 3 orthogonally oriented axes
Full scale: ±2g (optional ±4g, ±8g)
Dynamic range: 73 dB @1000 sps, 83 dB @100 sps, 93 dB @10 sps (2g model)
Noise density: 22.5 μg/√Hz typ

Technical specifications — Guardian DA-Plus
Sensor type: MEMS accelerometer
Axes: 3 orthogonally oriented axes
Full scale: >±10g
Dynamic range: 125 dB @1000 sps, 141 dB @100 sps, 157 dB @10 sps
Noise density: 0.25 μg/√Hz typ @100 sps

General specifications (Guardian DA and DA-Plus)
Sampling rates: 10, 25, 50, 100, 200, 250, 500, 1000 sps
Time sync: RTC (0.5 ppm drift); NTP; optional GNSS
Recording modes: Continuous recording via SeedLink; event recording on configurable thresholds with selectable pre/post-trigger; signal statistics (min, max, mean, RMS) with intervals selectable from 10 to 100 s
Data storage: Internal 32 GB, internal microSD support
Data formats: Solgeo EVE, MiniSEED, ASCII, CSV

Environmental specifications
Operating temperature: -20 to +70 °C without internal battery; -20 to +50 °C with internal battery*
Storage temperature: -40 to +90 °C without internal battery; -20 to +50 °C with internal battery
Humidity: 0–100%
*Recommended temperature range is narrower during battery charging

Physical specifications
Weight: 1.2 kg
Dimensions (LxWxH): 130 mm x 160 mm x 80 mm
Enclosure: painted aluminium
Ingress protection: IP67
Power connector: 6-pin MIL-C-26482 terminal

Operational notes
Supports real-time data transmission and integration with acquisition systems and monitoring platforms; web interface for local/remote configuration and diagnostics.

Key features / technical summary

• Model: Guardian DA (variants including DA-Plus)
• Sensor: triaxial MEMS accelerometer
• Full scale: DA: ±2g (opt. ±4g, ±8g); DA-Plus: >±10g
• Dynamic range: up to 157 dB (DA-Plus @10 sps)
• Noise density: DA: 22.5 μg/√Hz; DA-Plus: 0.25 μg/√Hz @100 sps
• Sampling: up to 1000 sps
• Memory: 32 GB internal + microSD
• Formats: Solgeo EVE, MiniSEED, ASCII, CSV
• Synchronization: RTC, NTP, optional GNSS
• Protection: IP67; aluminium enclosure
• Optional power: PoE, internal battery (up to 20 h)