Inline viscosity measuring method and an associated inline viscosity measuring device

An inline viscosity measuring device for measuring a pressure difference for determining a viscosity of a flowable medium, containing a measuring section which is arranged in a tubular element and which is configured for a flow of the flowable medium, wherein the measuring section is configured as a flow channel, wherein the tubular element comprises a longitudinal axis, an inlet end and an outlet end, wherein the measuring section extends at least between the inlet end and the outlet end, wherein at least one installation element is arranged in the measuring section, wherein an inlet pressure sensor for measuring a measured inlet pressure value is arranged at the inlet end, wherein an outlet pressure can be measured at the outlet end so that a measured outlet pressure value is obtainable, wherein the inline viscosity measuring device contains a transducer for converting the measured inlet pressure value and the measured outlet pressure value into measured variables which can be processed by a computer unit, so that a differential pressure between the measured inlet pressure value and the measured outlet pressure value can be determined from the measured variables by means of the computer unit, wherein the at least one installation element is configured as at least one web element, wherein the at least one web element projects into the flow channel with a web element length LS which corresponds to at least 25% of a diameter DS of the flow channel.