FAQ: Accelerometer for use in boat engine

Document created by Online Support Moderator on 13-Dec-2016Last modified by Online Support Moderator on 26-Dec-2016
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I have been asked to embed an accelerometer into the engine control module. It would normally be used when the engine is not running to determine static angle with respect to gravity; low G, angle sensor. However, once the engine starts running there will be significant vibration; the controller is mounted to the engine. For discussion purposes it may be considered 10 g random, up to about 3000 Hz. The specification indicates the normal operating ranges and then indicates a couple of shock type accelerations (absolute maximums). But these are very short duration (3000 g, 0.5 ms) or (10000 g for 0.1 ms). What would be the suitability of the device if exposed to continuous 10 g random vibration? 15 g? 20 g?


There is no problem to have accelerometer to experience 10g/20g event constantly.  The part is designed to sustain 10Kg shock. 
For marine application, it is recommended to use automotive grade part for longevity and high quality.  Please consider AIS328DQTR (+-2g for sensing gravity, tilt angle).  Alternatively, consider our industrial part, IIS328DQ (also longevity).  For lowest cost part use LIS2DH12.
(extracted from ST Online Support)