System for determining and/or monitoring a state variable of a measurement object and respective method

System for determining and/or monitoring at least one state variable of soil, the system comprising

• at least one analysis sensor, a control apparatus and a read-out apparatus,
• wherein the analysis sensor is configured to be introducible into the soil for remaining within the same,
• wherein the analysis sensor is configured to be sensitive to at least one ion type, and to generate measurement data based on a concentration of the ion type in the soil,
• wherein the control apparatus is configured to control the analysis sensor with respect to the generation of the measurement data, and
• wherein the read-out apparatus is configured to read out the measurement data from the analysis sensor,
• the system further comprising a permanent individual network with a common central network node,
• wherein several analysis sensors exist, which are sensitive to the same ion type or to different ion types, wherein the several analysis sensors are configured to be wirelessly read-out via the common central network node, wherein the analysis sensors each comprise an RF transmitter for wirelessly transmitting sensor data,
• wherein the read-out apparatus comprises a first read-out unit and a second read-out unit, the first read-out unit being configured as the common central network node, and wherein the first read-out unit is a stationary read-out unit being arranged remote from the analysis sensors and configured to wirelessly read out the analysis sensors, the first read-out unit being configured to reside inside the soil, and wherein the second read-out unit is a mobile read-out unit configured to be disposed outside the soil and being configured to communicate wirelessly with the first read-out unit when residing inside the soil
• wherein the analysis sensors and the first read-out unit are configured to be permanently buried in the soil, and
• wherein the system further comprises at least one energy source that is configured to supply the at least one analysis sensor with energy, wherein the energy source comprises at least one accumulator, and wherein the energy source is configured to be charged inductively.