I need some suggestions to change purely mechanical pressure switches to others with analog display. Those with 4-20 transmitters are well-suitable too.

Now I don't need to be specific. So, you're free to suggest ones with any diameter and type connections. Source may be either 127 VAC or 24 VDC. Preferred ranges: 0-10bar, 0-50bar, 0-100bar.

I intend use them in ESD (emergency shutdown) relay panels to motors and turbines.

 

Have a look at
http://www.directindustry.com/prod/...s/electronic-pressure-switch-12601-25676.html

Roy