Measuring arrangement, comprising a transmitter with a sensor for measuring a measured variable of a medium, wherein the sensor outputs a primary signal that depends on the measured variable: a transmitter housing, which defines, in its interior, at least one chamber, and which has a first opening on the medium side and a second opening, wherein a first section of a contamination path extends from the first opening to the second opening, said path passing through the at least one chamber; a first seal, which interrupts the first section of the contamination path; an electronic circuit, which is arranged in the at least one chamber, wherein the circuit processes the primary signal of the sensor and generates an output signal which is output via a first section of a signal path that passes through the second opening; characterized in that the measuring arrangement also has a safety module, with a module housing, which defines, in its interior, at least one module chamber, and which has a first module opening on the transmitter side and a second module opening, wherein a second section of the contamination path extends from the first module opening at least into the at least one module chamber; at least a second seal, which interrupts the second section of the contamination path; and a second section of the signal path, wherein the safety module can be connected to the transmitter in such a way that the second section of the contamination path meets the first section of the contamination path; and the second section of the signal path meets the first section of the signal path in order to pass on the output signal from the first section of the signal path; and a leak detector, which monitors a part of the contamination path which is arranged between the first seal and the second seal in order to identify and signal the failure of the first seal, wherein the leak detector changes the signal level of the output signal if a leak occurs. a transmitter housing, which defines, in its interior, at least one chamber, and which has a first opening on the medium side and a second opening, wherein a first section of a contamination path extends from the first opening to the second opening, said path passing through the at least one chamber; a first seal, which interrupts the first section of the contamination path; an electronic circuit, which is arranged in the at least one chamber, wherein the circuit processes the primary signal of the sensor and generates an output signal which is output via a first section of a signal path that passes through the second opening; characterized in that the measuring arrangement also has a safety module, with a module housing, which defines, in its interior, at least one module chamber, and which has a first module opening on the transmitter side and a second module opening, wherein a second section of the contamination path extends from the first module opening at least into the at least one module chamber; at least a second seal, which interrupts the second section of the contamination path; and a second section of the signal path, wherein the safety module can be connected to the transmitter in such a way that the second section of the contamination path meets the first section of the contamination path; and the second section of the signal path meets the first section of the signal path in order to pass on the output signal from the first section of the signal path; and a leak detector, which monitors a part of the contamination path which is arranged between the first seal and the second seal in order to identify and signal the failure of the first seal, wherein the leak detector changes the signal level of the output signal if a leak occurs.