Mercury is not allowed anymore. So other solutions like the spring type or ball like the one I am using is prefered.

I have ordered a packet of 200 pcs spring type sensor and will see if it works as expected. Since this is a production design, I cannot experiment with diy coils or springs. Thanks all for the ideas, but a ready made solution is prefered.

I have a feeling that either sensor, the one I am using now (see the pdf on the #1 post), or the spring type, it will need some kind of filtering or integration. Maybe the idea of a resistor-capacitor will help as AvionincsMaster1 posted.

Ioannis