A vortex mass flowmeter includes a body for placement in a flow path of a fluid and four capacitive sensors. The body has a sleeve and a rod positioned within a chamber in the sleeve. Two of the capacitive sensors are mounted to sense lateral deflection of the sleeve relative to the rod and...http://www.google.com/patents/US5804740?utm_source=gb-gplus-sharePatent US5804740 - Capacitive vortex mass flow sensor
