Meggitt Sensing Systems introduced the Endevco model 7251A series, a family of small, lightweight, hermetically sealed piezoelectric accelerometers with integral electronics. The centrally located thru-bolt mounting hole of this series provides both 360-degree cable and connector orientation, allowing the sensor to offer a flat mounting surface, even when not fully perpendicular, for ease of use in a variety of applications. Available in standard model sensitivity ranges from 500 mV/g to 10 mV/g with optional high-temperature and TEDS versions, the 7251A series incorporates an annular shear piezoelectric sensing element, along with an internal hybrid signal conditioner, within a two-wire system. The system transmits its low-impedance voltage output through the same cable that supplies constant current power, with high-output sensitivity and wide bandwidth, while exhibiting low base strain sensitivity and excellent output stability over time. Weighing just 10.5 grams, it effectively minimizes mass loading effects. (