GeoSIG AC-2x Accelerometer

The AC-23 package is a triaxial accelerometer sensor designed for Strong Motion and industrial applications where a high sensitivity is required. The AC-2x series are state-of-the-art servo-accelerometers based on standard exploration geophone mass-spring system with electronic feedback. Having remarkable temperature and aging stability because of the very simple principle, the AC-2x rarely requires maintenance.

Triaxial, biaxial and uniaxial configurations are all available in surface models, complementing the versatile useability of the AC-2x.

The AC-2x is housed in a sealed cast aluminium housing with the dimensions of 195 x 112 x 95 mm. The housing also offers a single bolt mounting system with three levelling screws. Stainless steel housings as well as internal mounting inside GSR-xxAH housing options are available. With the help of the TEST LINE the sensor can be easily and completely tested. Full scale is user selectable on site by setting the internal jumpers. The AC-2x accelerometer is directly compatible with the GeoSIG recorders.

• General Characteristics

• Application
• Strong Motion earthquake survey industrial applications requiring high sensitivity
•  

  Configurations:	Triaxial	Biaxial	Uniaxial	Axes	Alignment**
  AC-23 or AC-23i*	X			X – Y – Z	H – H – V
  AC-22-H or AC-22i-H*		X		X – Y	H – H
  AC-22-HV or AC-22i-HV*		X		X (or Y) – Z	H – V
  AC-21-H or AC-21i-H*			X	X (or Y)	H
  AC-21-V or AC-21i-V*			X	Z	V

• * i : Internal sensor   ** H: Horizontal, V: Vertical
• Full Scale Range:
• Factory configurable to: ± 0.1, ± 0.2, ± 0.5, ± 1, ± 2 and ± 4g for ± 10 V diff at output AC-23 NPP: ± 0.5, ± 1 and ± 2g

• Sensor Element

• Type:
• Servo-accelerometer based on geophones with feedback
• Dynamic Range:
• > 140 dB correlated mean RMS noise amplitude (per-bin) with respect to 4 g full scale
• Non-linearity:
• 0.1%
• Accuracy:
• ± 0.4 dB max over the bandwidth
• Cross Axis Sensitivity:
• 1%
• Bandwidth:
• 0.1 Hz (1 pole) to 100 Hz (1 pole) optional 200 Hz damping: 0.7 critical
• Offset Drift
• < 1 mV/0C
• Span drift:
• < 200 ppm/0C
• Full Scale output:
• 0 ± 10 V differential (20 Vpp) optional 2.5 ± 2.5 V single-ended (5 Vpp) 0 to 20 mA current loop
• Application
• Strong Motion earthquake survey industrial applications requiring high sensitivity
• 

• Power

• Power supply voltage:
• 12 VDC regulated (10 to 15 V)
• Consumption:
• 26 mA typical, 140 mA max @15 VDC
• Mating:
• Binder / Coninvers type RC
• Overvoltage Protection:
• All pins are protected

• Connector Pin Configuration

• Pin 1-2, 3-4, 5-6:
• Signal output for axis X, Y, Z
• Pin 7-8:
• Test input, Digital test-pulse (0 / 12 V)
• Pin 9-10:
• +12 VDC Power Supply
• Pin 11-12:
• Auxiliary input (unused)
• Case:
• Shielded Ground

• Environment/Housing

• Housing Type:
• Cast aluminium sealed access cover
• Housing Size:
• 195 x 112 x 95 mm
• Weight:
• 2.5 kg
• Index of Protection:
• IP 65 optional IP 68
• Temperature Range:
• - 20 to 70 °C (operating)
  - 40 to 90 °C (non-operating)
• Humidity:
• 0 to 100 %
• Orientation:
• Floor or wall mounting (to be specified in order)
• Standard AC-23
• Floor mounted, Full scale ± 2 g, 2 m cable with cable inlet and recorder mating connector, concrete anchor bolt and user manual on CD
• 

• Optional Accessories

• Cable & connector:
• Cable connector metallic, Shielded, IP67, 12 pins, male optional MIL, Bendix PT07A 14-19P cable with shielded twisted pairs for any length (including mating sensor connector with open end cables for connection to GeoSIG recorder connector on user specification mounted at cable end
• Housing:
• Watertight IP 68 housing, stainless steel protective housing
• Mounting:
• Wall mounted

• Ordering Information

• Specify:
• Type of AC-2x, full scale range, and other applicable options

• **Specifications subject to change without notice