A method and an apparatus for determining fluid flow through a pressure regulator
is disclosed. The pressure regulator is disposed in a fluid flow passage and has
a throttling element moveable in the flow passage. A stem is attached to the throttling
element. The apparatus includes a first pressure sensor for measuring pressure
upstream of the throttling element, a second pressure sensor for measuring pressure
downstream of the throttling element, and a travel sensor for detecting the position
of the throttling element. A processor is provided which includes a stored algorithm
for determining flow rate based on the measured pressure and travel values and
for calibrating the pressure regulator using a temporary flow meter disposed downstream
of the throttling element. A system and method is also provided for calibrating
a temperature transmitter associated with the pressure regulator.
