Process variable e.g. viscosity, determining and/or monitoring device, has window unit permitting determination of variable using reference sensor, sensor unit determining and/or monitoring variable, and fastening unit fastening sensor unit

摘要

The device has a window unit (5) for permitting determination of a process variable e.g. viscosity, using a reference sensor (6). A sensor unit (3) determines and/or monitors the process variable. A fastening unit (4) fastens the sensor unit. The measurement of the process variable is uninfluenced by the sensor unit. The window unit is arranged partially in the sensor unit and/or in the fastening unit. The sensor unit has an antenna. The window unit is transparent for laser light. The process variable concerns a fill level of a medium (1) in a container (2).