COMBINED PRESSURE AND TEMPERATURE CORRECTION APPARATUS FOR GAS METERS

摘要

COMBINED PRESSURE AND TEMPERATURE CORRECTION APPARATUS FOR GAS METERS A self-contained unit integrally operable in conjunction with a gas meter registers equivalent standard gas volume by correcting actual gas volume for both pressure and temperature. A magnetic couple provides a drive input to the correction unit at a rate proportional to the operational rate of the meter. Separate temperature and pressure sensitive mechanisms exposed to the gas flow each provide a linear displacement proportional to changes in their absolute condition. Respective displacement of each is supplied independently to a dual input single output multiplying mechanism from which an integrated output serves to position a limiting cam in angular correlation therewith. Position of the cam effectively modifies the drive input from the magnetic couple through a crank and clutch arrangement that drives the corrected register at a rate correlated to the integrated function of absolute pressure and temperature of the metered gas.