An LVDT (Linear Variable Differential Transformer) Variable Area Rotameter, is a meter designed to measure the flow rate of a fluid or gas.
Mechanism The flow meter utilizes a unique combination of a tapered metering cone in series with a piston. The position of the metal piston is sensed by the LVDT circuitry and is then translated into a flow rate. This non linear signal can be directly displayed or linearized with an electrical output.
Benefits Advantages include the ability to externally measure very low flow rates.
See also Cyclonic flow meter
References