3-channel seismograph Guardian AS

with rechargeable batterydata acquisitioncompact

Overview
Guardian AS is a Class 1 tri-axial seismograph designed for structural monitoring of buildings. Compact and precise, it measures dynamic velocity in compliance with DIN 4150-3, DIN 45669-1 and UNI 9916.

General features
Equipped with a linearized triad of geophones offering a dynamic range greater than 130 dB, it ensures reliable data and quick installation via a single-anchor plug system and leveling adjustment screws for perfect alignment on any surface.
Advanced data and connectivity management supports standard protocols (e.g. SeedLink) for integration with professional software. Client/server FTP/SFTP functionality enables file transfer to internal flash memory. Web interface (Seismic Web Configurator) allows status monitoring, waveform viewing and remote configuration. Integrated alert system with digital output and LED status indicators.

Optional configurations

• PoE (Power over Ethernet) power supply
• Internal battery (up to 10 h autonomy)
• Internal GNSS receiver for time synchronization

Applications

• HVSR measurements
• Civil structural monitoring
• Seismic networks

Technical specifications
Sensor type: Electronically equalized geophone
Number of axes: 3, orthogonally oriented
Measurement ranges: ±12.5, ±25, ±50, ±100 mm/s
Sensitivities: 40, 80, 160, 320 V/m/s
Frequency response: 1 Hz to 80 Hz @200 sps; 1 Hz to 125 Hz @500/1000 sps
Sampling rates: 10, 25, 50, 100, 200, 250, 500, 1000 sps
Resolution: 32 bit
Dynamic range: >130 dB
Linearity: ±0.4 dB (Class 1 - DIN 45699-1)
Phase: Class 1 - DIN 45699-1
Synchronization: RTC with 0.5 ppm drift; NTP synchronization; optional integrated GNSS
Recording modes: Continuous recording with SeedLink; event recording on configurable thresholds with selectable pre/post-trigger length; signal statistics (min, max, mean, RMS) with selectable interval from 10 to 100 s
Data memory: Internal 32 GB; internal microSD slot
Data formats: Solgeo EVE, MiniSEED, Ascii, CSV

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

Physical characteristics
Weight: 4 kg
Dimensions (LxWxH): 160 mm x 160 mm x 130 mm
Enclosure: Painted aluminium
Ingress protection: IP67

Key features / Technical summary

• Sensor: electronically equalized tri-axial geophone, Class 1
• Dynamic range: >130 dB; 32-bit resolution
• Measurement ranges: up to ±100 mm/s; multiple selectable sensitivities
• Sampling: up to 1000 sps
• Data formats: MiniSEED, CSV, Ascii, Solgeo EVE
• Memory: 32 GB internal + microSD
• Synchronization: RTC/NTP; optional GNSS
• Environmental protection: IP67; wide operating temperature range