Arrangement designed to implement safety integrity level measures in an installation, comprising at least a field device, at least a sensor unit or a signal detection unit (3, 3a, 3b, 3c) which is associated with, or can be associated with, said field device and which has a sensor part and at least a function block (10, 10a, 10n), wherein at least a mobile computer unit is provided to perform calculations and/or analyses, wherein, for the purpose of wireless intercommunication, the at least one sensor unit or signal detection unit (3, 3a, 3b, 3c) and the at least one mobile computer unit each comprise at least one apparatus (7, 7a, 7b, 7c, 40) for the wireless transmission and reception of data and/or signals, wherein the apparatus or another apparatus of the mobile computer unit is used for wireless communication with a control system, wherein said control system receives current measured values of the field device via a cable connection and transmits said values wirelessly to the mobile computer unit, wherein the apparatus (7, 7a, 7b, 7c) designed for the wireless transmission and reception of data and/or signals of the sensor unit or the signal detection unit (3, 3a, 3b, 3c) can be connected to or is connected to the at least one function block (10, 10a, 10n) and/or to the sensor part of the sensor unit or the signal detection unit (3, 3a, 3b, 3c) in order to provide wireless access for the mobile computer unit to the function block (10, 10a, 10n) and/or to the sensor part, characterized in that the mobile computer unit is designed to calculate a theoretical measured value from the data and/or the signals of the sensor unit or the signal detection unit (3, 3a, 3b, 3c), or to calculate an actual value from the data and/or the signals of the function blocks, to compare the theoretical measured value or the actual value to the actual measured value or to a target value, and to draw conclusions about potential errors in the signal transmission or measuring chain on the basis of the comparison. wherein at least a mobile computer unit is provided to perform calculations and/or analyses, wherein, for the purpose of wireless intercommunication, the at least one sensor unit or signal detection unit (3, 3a, 3b, 3c) and the at least one mobile computer unit each comprise at least one apparatus (7, 7a, 7b, 7c, 40) for the wireless transmission and reception of data and/or signals, wherein the apparatus or another apparatus of the mobile computer unit is used for wireless communication with a control system, wherein said control system receives current measured values of the field device via a cable connection and transmits said values wirelessly to the mobile computer unit, wherein the apparatus (7, 7a, 7b, 7c) designed for the wireless transmission and reception of data and/or signals of the sensor unit or the signal detection unit (3, 3a, 3b, 3c) can be connected to or is connected to the at least one function block (10, 10a, 10n) and/or to the sensor part of the sensor unit or the signal detection unit (3, 3a, 3b, 3c) in order to provide wireless access for the mobile computer unit to the function block (10, 10a, 10n) and/or to the sensor part, characterized in that the mobile computer unit is designed to calculate a theoretical measured value from the data and/or the signals of the sensor unit or the signal detection unit (3, 3a, 3b, 3c), or to calculate an actual value from the data and/or the signals of the function blocks, to compare the theoretical measured value or the actual value to the actual measured value or to a target value, and to draw conclusions about potential errors in the signal transmission or measuring chain on the basis of the comparison.