DEVICE FOR MEASURING PRESSURE OF GASSY MEDIUM AND METHOD OF DETERMINING AT LEAST ONE OF HEIGHT, VOLUME, DENSITY AND MASSOF LIQUID MADE TO BE CONTAINED IN STORAGE TANK

摘要

An apparatus for measuring gas pressures including a piston slideably guided in a cylinder, at least one of the gas pressures acting on one of the two face surfaces of the piston the piston face forming a pressure chamber with the interior of said cylinder. Hydrostatic bearings are provided between the piston and the cylinder for relative movement therebetween essentially without friction. Hydrostatic liquid to hydrostatic bearings, at least one receptable connected to said pressure chamber for receiving any hydrostatic liquid penetrating from said hdyrostatic bearings into the pressure chamber. Provision is made for maintaining the hydrostatic liquid in the receptacle at a predetermined level, as well as for removing hydrostatic liquid from the receptacle under control of a level maintaining element and a force measuring element engaging the piston.