Method for checking a signal path of an electronic sensor circuit for a field device in automation technology

A method for checking a signal path of an electronic sensor circuit for a field device in automation technology, wherein the sensor circuit includes the signal path having a transducer element for detecting, converting, and outputting a process variable to an output of the transducer element in the form of analog raw measured values, an analog-digital converter connected downstream from the transducer element to convert the analog raw measured values into digital raw measured values, and a digital processor, downstream from the analog-digital converter which is fed the digital raw measured values and the digital processor is designed to further process the digital raw measured values in a measuring mode into measured values, the method comprising:

• interrupting the measuring mode;
• replacing the analog raw measured values at the output of the transducer element with an analog check signal;
• passing the analog check signal through the signal path so that the digital processor determines a measured value corresponding to the analog check signal;
• checking the determined measured value with a comparison value determined for the signal path;
• and
• identifying a change in a state of the signal path when the measured value determined for the analog check signal is outside a defined tolerance range for the comparison value.