Patent ID: 8794061

Claim:
A system for measuring in situ the density of a drilling mud in combination with a drilling well mud tank, said system comprising: at least two corrosion-resistant pressure sensors separated by a known vertical distance on the system, wherein the at least two pressure sensors comprise corrosion-resistant fluid-contacting parts comprising a pressure sensing facing, said pressure sensing facing comprising a ceramic material, wherein the at least two pressure sensors are fixed to at least one rigid body, said rigid body comprising a float that floats on the surface of the drilling mud in the drilling well mud tank and at least one sensor housing attached to said float such that when the system is in situ the sensor housing is submerged in the drilling mud below the float, and wherein said sensor housing contains said at least two sensors spaced a vertical distance apart in the housing such that each sensor occupies a different vertical position in the drilling mud when the system is in situ.