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High Performance Broadband Seismometer
Brand: Reftek Systems IncThe 151B Observer is a force-balance feedback sensor with available frequency bandwidth from 0.0083 (or 120 s) – 50 Hz.
It is ideal for use in seismicity studies due to its low self-noise performance. It can be effectively installed in observatory, portable, surface and posthole applications.
Features one vertical and two horizontal, completely independent sensors with built-electronic feedback circuit.
The 151B Observer contains three independent sensors (one vertical and two horizontal) with built-in electronic feedback circuit, control and power conversion circuits, featuring low noise, large dynamic range and easy installation and use.
The 151B Observer has a built-in mass zero-position adjusting mechanism to perform automatic mass adjustment.
As soon as the seismometer is powered it checks the zero position of each component’s mass and automatically adjusts the zero position if needed.
Monitoring and adjustment of the mass can also be performed via the 130S series High Resolution Recorders using the Sensor Control Board.
The 151B Observer is an exceptionally low noise seismometer. The low self noise performance makes the 151B an ideal seismometer for local, regional and global seismicity studies in different installation configurations.
Features- Low self-noise over a wide bandwidth
- Low power consumption
- Force-balance electronics feedback
- Robust mass-locking mechanism
- Portable, easy installation
1 - 5 of 5 Part Numbers
100719-33
97118-00
97118-35
97118-50
97177-00
1 - 5 of 5 Part Numbers
Specifications
Brand
Size
- 9.45” dia. x 10.6” high (24 cm x 27 cm)
Weight
- 26.4 lbs (12 kg)
Watertight Integrity
- IP67 for outdoor use & immersion resistance
Humidity
- 0-100 % (Non-Condensing)
Alignment
- Removeable orientation N/S pins screw into the base (brass for N, silver for S)
Leveling
- Two Integrated Bubble Levels, three adjustable leveling feet with locknuts
Mass Position
- Remote Monitoring and Adjusting Zero-point using 3 Independent Voltage Outputs
Mass Locking
- Mechanical Lock/Unlock Mechanism Accessible on Outside of the Case
Mechanical Zero
- No need for Adjustment within Ambient Temperature Fluctuation ± 20° C
Sensor Type
- Triaxial, Orthogonal
Feedback
- Force-balance with Capacitive Displacement Transducer
Frequency Bandwidth: 151B-120
- 0.0083 Hz (120 sec.) - 50 Hz
Sensitivity
- 2000 V/m/s
Full Scale Output
- ± 20 V Peak-to-Peak Differential
Dynamic Range
- > 145 dB (0.01~0.1 Hz)
- > 160 dB (0.1~10 Hz)
Self-Noise (Low Model)
- Below NLNM from 145 sec. to 10 Hz
Output Impedance
- < 100 Ohms
Calibration
- Coil Resistance 1,000 Ω Sensitivity: 10 m/s²/A
Distortion
- Total Distortion < -80 dB
Cross Axis Coupling
- < 1 %
Low Spurious Resonance
- Higher than 100 Hz
Damping
- 0.7 of Critical
Linearity
- Better than 1 % of Full Scale
Operating Temperature
- -20° C to +60° C
Power Input
- +12 Vdc (9 V to 18 Vdc)
Power Consumption
- ~1.1 W
Power-Fail Protection
- Built-in
Auto-Recovery Time
- Full operation recovery within 10 minutes after either power fail or signal overload
- Local and regional seismic networks
- Broadband surface or posthole installation
- GSN Installation