It may seem obvious to use widely available analog devices MEME accelerometer for measurement in range of 0.5g. I did thorough study on this and found out that MEMS sensors either doesn't work or become erratic in high EMF surrounding. Since I wanted to measure transformer vibration and corresponding frequency by attaching the sensor on surface of transformer, it would always be in vicinity of high EMF.
There are industrial piezoelectric sensor available for this purpose but it doesn't detect small vibration in 0.5g range. There are industrial sensor available from National Instrument but looks very costly. Is there any particular segment of sensors which is recommended for this particular application?