Light ring on a two-wire sensor

A two-wire field device comprising a measuring transducer for detecting a measured variable, an electronic unit for processing the measurement data, a two-wire interface for energy supply of the two-wire field device and for communication with a superordinate unit, wherein the two-wire field device has a visually remotely readable indicator unit for signaling a state of the two-wire field device, which is remote readable from a distance of at least 1 m, wherein the indicator unit is coupled with a light ring and by means of the light ring, radiation to ensure the remote readability in the radial direction of the light ring amounts to 360 degrees, wherein the entire two-wire field device including the visually remotely readable indicator unit is supplied with energy completely via the two-wire cable and the 4 mA to 20 mA current loop realized therein and the state of the field device comprises information about measured values.