EpiSensor FBA ES-T Surface Accelerometer
The EpiSensor FBA ES-T is the industry’s most widely deployed surface accelerometer, trusted for its superior sensitivity and reliability in a wide range of seismic monitoring applications. Featuring a triaxial force balance accelerometer design in a compact package, it offers unmatched versatility and dynamic range for earthquake early warning systems, permanent seismic networks, and energy sector installations. With user-selectable full-scale recording ranges from ±0.25g to ±4g, and a broad frequency response from DC to 200 Hz, the EpiSensor provides on-scale, precise recordings even in high-intensity seismic zones or near-fault locations. Its low self-noise design ensures a 155 dB dynamic range, setting the standard for seismic field sensors.
- Ultra-Low Self-Noise — Achieves an industry-leading 155 dB dynamic range for high-fidelity seismic recordings.
- Triaxial Configuration — Measures seismic activity in three orthogonal axes within a compact package.
- User-Selectable Range — Full-scale recording range adjustable from ±0.25g to ±4g for various site conditions.
- Wide Frequency Response — Captures seismic signals from DC to 200 Hz, suitable for strong-motion and structural applications.
- Flexible Output Options — Selectable output range from ±2.5V to ±20V differential, adaptable to most digitizers.
- High Precision — Minimal non-linearity, cross-axis sensitivity, thermal drift, and hysteresis ensure consistent performance.
- Ease of Deployment — Compact design makes installation fast and flexible in diverse field environments.
- Permanent Seismic Networks — Ideal for national or regional earthquake monitoring stations.
- Oil & Gas Exploration — Provides real-time vibration monitoring for drilling and production sites.
- Earthquake Early Warning Systems (EEWS) — Rapid event detection and transmission for early seismic alerts.
- Geothermal Energy Monitoring — Accurate assessment of subsurface seismicity during geothermal operations.
| Specification | Details |
|---|---|
| Model | EpiSensor FBA ES-T Surface Accelerometer |
| Dynamic Range | 155 dB+ |
| Bandwidth | DC to 200 Hz |
| Calibration Coil | Standard |
| Full-Scale Range | User selectable: ±0.25 g, ±0.5 g, ±1 g, ±2 g, ±4 g |
| Outputs | User selectable: ±2.5 V single-ended, ±10 V single-ended, ±5 V differential, ±20 V differential |
| Linearity | < 1000 μg/g² |
| Cross-Axis Sensitivity | < 1% (including misalignment) |
| ESD, RF, EMI Protection | Double stage transient protection with gas arrester elements |
| Power Consumption | 100 mA from single 12 VDC power supply; 35 mA from ±12 VDC power supply |
| Physical Size | 13.3 cm diameter (cylinder), 6.2 cm height |
| Weight | < 1.8 kg |
| Mounting | Single bolt mounting, three adjustable leveling feet, bubble level |
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