Safety module and measuring arrangement with safety module

A safety module, for connection to a measuring transmitter having a transmitter housing, wherein the measuring transmitter includes an electrical measuring signal-output, for communicating a measurement signal over a signal path, which passes through an opening of the transmitter housing, wherein the safety module comprises:

• a module housing, which defines at least one module chamber in its interior, and which has a first module opening on the side facing the measuring transmitter and a second module opening;
• at least one seal, which interrupts a contamination path through said module housing;
• a signal path section, which is connectable to the electrical measuring signal-output of the measuring transmitter, in order to conduct the measurement signal through the safety module, wherein the safety module is connectable with the measuring transmitter such that the first module opening communicates with the opening in the transmitter housing, so that the contamination path through said module housing communicates with an interior space of the transmitter housing;
• and
• a leak detector, which monitors a section of the contamination path located on the side of said at least one seal facing the measuring transmitter.

A measuring transmitter, having:

• a sensor for registering a parameter of a medium, wherein said sensor issues a primary signal dependent on the parameter;
• a transmitter housing, which defines at least one chamber in its interior, and which has a first opening on the side facing the medium and a second opening, wherein a contamination path reaches from said first opening to said second opening, and extends through said at least one chamber;
• a first seal, in said transmitter housing, interrupting said contamination path;
• a second seal in said transmitter housing, subsequent to said first seal, interrupting said contamination path;
• an electronic circuit, which is arranged in said at least one chamber between said first seal and said second seal, wherein said electronic circuit processes the primary signal of said sensor and produces an output signal, which is issued over a signal path extending through said second opening;
• and
• a leak detector, which monitors a section of said contamination path between said first seal and said second seal, wherein, in the case of failure of said first seal, said leak detector changes the signal level of said output signal of said electronic circuit.