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I work as a process engineer in a a vinyl chloride (VCM) plant. As a result of the cracking of one 1,2-dichloroethane molecule, a molecule of VCM and one of HCl are produced. Currently, we have a difference of 20 tons/day between the production of VCM reported by the coriolis flow meter and the production calculated estechiometrically with the production of HCl (there is no balance). Furthermore, these 20 tons/day are neither in the tanks or in the flare, so apparently, the sensor is not giving a correct measure. the sensor was changed, there was no difference. the calibration was verified and was ok. the installation was verified by a micro motion technician and was ok. The size of the line is 3", it seems that all doors are closed, i would really appreciate some help, thanks in advance