Apparatus for determining a vertical level or density profile of a fluid column

An apparatus for determining a density profile of a fluid column including at least two different liquids or a fluid column including at least one liquid with a varying solid content, the apparatus comprising:

• a support member;
• a plurality of measurement modules spaced apart, and supported along, the support member to form an array of measurement modules;
• and,
• a data processing unit,
• wherein each measurement module comprises:
• a support arm mounted to the support member and extending outwardly from the support member;
• a displacer carried on the support arm;
• a force measurement device configured to measure a force attributable to a mass of the displacer mediated by a buoyancy of the displacer in the fluid column,
• wherein the plurality of measurement modules have a data connection to the data processing unit for transmitting measurement data from the plurality of measurement modules to the data processing unit, and
• wherein the data processing unit is configured to process the measurement data from the plurality of measurement modules and generate a density profile of the fluid column.