How do you calculate the amount of steam added during heating?

With Steam Infusion being a direct heating process, monitoring the mass flowrate of steam to the Vaction™ unit provides us with a value for the mass of steam added. The steam flowmeters we have used historically are vortex flowmeters (monitoring the vortices generated passed a bluff body in the line with flow velocity proportional to the frequency of the vortices). The technical documentation states a measured error of ±1.7%. 

Typically, our steam infusion systems are mounted on load cells to allow for monitoring of ingredient additions. With load cells implemented on the system, we can validate the value produced by a steam flowmeter by cross checking the weight addition.