GeoSIG Ltd Wiesenstrasse 39 8952 Schlieren Switzerland AC-43 / AC-42 / AC-41-DH Downhole Accelerometer Features  Full Scale ± 2 g (± 0.625, 1, 4, 5 g optional) MEMS Inertial Sensor High shock survivability Wide operational temperature range High lifetime stability Cost effective sensor Simple test and calibration Strong mechanical design Fits in 3 inch casing Outline The AC-43-DH sensor package is a triaxial accelerometer designed for borehole applications regarding strong motion earthquake survey and monitoring. The AC-43 accelerometer is based on the modern MEMS (Micro Electro-Mechanical Systems) technology, consisting of sensing cells assembled in a way that optimizes their performances. This combined with the state of the art proprietary circuit design yields this cost effective and reliable accelerometer. MEMS cells include linear accelerometer sensing elements which measure the capacitance variation in response to any movement or inclination and a factory trimmed interface chip that converts the capacitance variations into analog or digital signal proportional to the motion. The DC response allows the sensor to be easily repaired, tilt tested or recalibrated in the field. With the help of the TEST LINE the AC-43 accelerometer can be completely tested assuring proper operation. The downhole casing contains the entire sensor system. The sensor is connected through Overvoltage Protection stage to the recorder at the surface with a cable. Using inclinometer tubes and the provided guiding wheels, the sensor can be oriented before insertion in the tube. Typical 100 mm casing or hole diameter Surface Borehole with or without casing Soft material Sand Sand CABLE Inclinometer tube SENSOR Hard rock Concrete Concr

Specifications AC-43 / AC-42 / AC-41-DH Downhole Accelerometer - Strong-Motion earthquake recording - Vibration monitoring - Alarm / Switch systems Biaxial General Characteristics Application: Full Scale Range: Sensor Element Type: Dynamic Range: Noise: Nonlinearity: Cross Axis Sensitivity: Bandwidth: Span drift: Offset Drift: Full Scale Output: Measuring Range: Consumption: Connector: Mating: Overvoltage Protection: 7 to 15 VDC, single supply optional, 7 to 30 VDC 9 mA @12 VDC Metallic, Shielded, IP67, 12 pins, male optional MIL, Bendix PT07A 14-19P Binder / Coninvers type RC All pins are protected...