• Accelerometro Force Balance Afb 01

Force Balance Accelerometer AFB

Accelerometer Force Balance AFB is a high sensitivity sensor for long-term monitoring of dams and buildings, ideal for studying seismic events at low frequencies of motion.

Solgeo Models AFB Force Balance Accelerometers are high sensitivity, low noise sensors designed for use in seismic and low level, low frequency motion studies.
The accelerometers are self-contained and provide a high level, low impedance output.
No signal conditioning is required in most applications.
These sensors utilize low noise electronics in conjunction with the force balance principle to make possible measurements in the low frequency micro-G range. Aside from the traditional DC-coupled zero output, the AFB-3C& 2C & 1C also provides AC coupled zero output which eliminates tilt induced or offset errors facilitating high amplification of the basic output.
Main features
  • Single, biaxial or triaxial accelerometer settings
  • available in 2 different configurations for horizontal or vertical mounting
  • 2 different output cable types: connector or gland cable.
  • Long-term monitoring on dams, buildings and heritage structures
  • Monitoring that requires higher sensitivity
Mines and quarries
Dam monitoring
and microseismic networks
Technical Characteristics
Electronic features
Number of channels±0,25 g, ±0,5 g, ±1 g, ±1 g, ±2 g, ±4 g
Full scale acceleration (available Ranges)±0.25 G; ±0.5 G; ±1 G; ±2 G; ±4 G
Output voltage±10 volts differential
Sensitivity±40V/g; ±20V/g; ±10V/g; ±5V/g; ±2,5V/g
Frequency response0-200 Hz
Operating voltage10-15Vdc (80mA for 3 axis unit)
Output impedance100 Ohm
Dynamic range1g version
>135dB (USGS CPSD method)
>165dB (per bin with respect to full scale
Non-linearity<0,1% f.r.
Cross axis sensitivity<0.5%
Offset drift0.5 mg/°C
Full scale drift200 ppm/°C
Sensor test1/8 fs
Input test1/8 fs
Orthogonality error<0.05%
Environmental characteristics
Temperature, operating-20 to +55 °C
Temperature, storage-40 to +70 °C
Humidity100% R.H.
Physical characteristics
Weight3 kg
Dimension (LxWxH)140 x 155 x 85 mm (without connectors) triaxial model
169 x 53 x 81 mm (without connectors) mono and biaxial model
Case materialAluminium with anti-corrosive treatment
Protection ratingIP67 with connector or IP68 with cable gland
Electrical Interface10 terminal pins CONNECTOR / cable gland