Weir-Jones Group


SSA Accelerometers

Tri-axial Force-Balance Accelerometers

The Terra Flex SSA 320 Series Servo Accelerometers offer an unparalleled combination of high performance and excellent stability. Housed in a Terra™ compact accelerometer enclosure, the small size and convenient single bolt attachment allow the SSA-320 tri-axial accelerometer to be installed with a footprint that is as small as, or smaller than, most uni-axial force balance accelerometers. The SSA-Series electronics employ surface mount technology and modular design with low power consumption of only 5mA per axis. Circuit cards and sensor elements are designed with connectors for easy removal and maintenance.

Typical applications include seismic monitoring applications, vibration measurements, and tilt sensing in both indoor and outdoor environments. The corrosion resistant enclosure is NEMA 6P rated, which provides submersion protection in up to six feet of water.

The SSA Series has several variants in addition to Standard:

 RH - Radiation Hardened

SSA-RH Servo Accelerometers operate in nuclear power plants, space, or other radiation prone environments. Housed in a stainless steel Terrascience compact accelerometer chassis, the unit can withstand a maximum dose of 100Krads(Si) at a dose rate of 1-120 rads(Si)/sec.

 D - Digital

SSA-D Servo Accelerometers convert the acceleration to 24-bit digital number and transmit it through industry standard digital interfaces including RS232 and RS485.

 SLN - Super Low Noise

SSA-SLN Servo Accelerometers provide 144dB typical dynamic range with a noise floor of less than 0.5μg. The exceptional linearity (<0.05% error) with low cross-axis error and virtually no hysteresis make the SLN the ideal choice for high dynamic range seismic data acquisition where sensor accuracy is critical.

There are also 3 enclosure options for the SSA series:

 Standard - Weir-Jones Blue Power-Coated Terra™ Enclosure

 Aluminum - Brushed Aluminum Terra™ Enclosure

 Stainless - Stainless-Steel Terra™ Enclosure