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

Full Scale ± 0.1, 0.2, 0.5, 1, 2 and 4g jumper selectable (NPP: ± 0.5, ± 1 and ± 2g Full Scale)
Bandwidth 0.1 Hz to 100 Hz (optional 200 Hz)
Excellent temperature stability
Strong-Motion, Free field and Industrial applications
Different housing and mounting options are available
Single Bolt Mounted Enclosure provides up to ± 10° of Levelling Adjustment

Download: Data sheet