Patent ID: 7120543

Claim:
An electronic gas flow measurement device for use with an orifice meter mounted in a gas pipeline, said device comprising: (a) a housing; (b) a computer enclosed with the housing, and having a microprocessor and a read-only memory (ROM); (c) data input means, for entering data in the ROM; (d) data output means, for retrieving data stored in the ROM; (e) means for receiving gas temperature inputs; and (f) means for receiving gas pressure inputs from upstream and downstream of the orifice plate of the orifice meter; wherein: (g) the ROM is adapted to store look-up tables of intermediate values for selected gas flow calculation parameters determined in accordance with one or more selected calculation method for selected ranges of gas temperature, density, and pressure differentials; and (h) the microprocessor is programmed with software for: h.1 selecting intermediate values from the look-up tables corresponding to gas temperature and temperature inputs; and h.2 processing the selected intermediate values to calculate gas flow rates adjusted for temperature, pressure, and density, in accordance with one or more selected gas flow rate calculation methods.