Method for verifying a density and/or viscosity measuring device in a measuring station

A method for verifying a density measuring device in a measuring station of a process installation during ongoing operation in which a medium flows through a main channel of the process installation, the method comprising:

• providing a side channel, which is fluidically connectable to the main channel via two sections of the main channel having mutually differing diameters, wherein the side channel is configured to enable a parallel flow therethrough relative to the flow through the main channel;
• providing a microelectromechanical systems-based (MEMS-based) master density measuring device in the side channel such that the medium flows through the MEMS-based master density measuring device when fluidically connected to the main channel;
• providing a main channel adapter, which is arranged in or at the main channel and which is configured to control flow of the medium through the side channel such that, only when the MEMS-based master density measuring device is mechanically connected to the main channel adapter, the medium flows through side channel;
• connecting the side channel, including the MEMS-based master density measuring device, to the main channel adapter, wherein the medium flows through both the main channel and side channel;
• performing at least one verification measurement with the MEMS-based master density measuring device;
• and
• verifying the density measuring device based on the at least one verification measurement performed by the MEMS-based master density measuring device.