Patent ID: 7987726

Claim:
A pressure measuring transducer comprising: a pressure measuring chamber; a pressure sensor arranged in said pressure measuring chamber; pressure transfer means connected to said pressure measuring chamber, which is sealed against external surroundings by a separating diaphragm, and on which a pressure to be measured acts externally in a measurement operation; a sealed inner space, which includes the inner spaces of said pressure transfer means and said pressure measuring chamber, which is filled with a pressure transmitting liquid, and which serves in measurement operations, for transferring a pressure acting on said separating diaphragm to said pressure sensor; and an apparatus for diagnosis of liquid losses, which includes, arranged in said sealed inner space, a test element, whose outer volume located in said sealed inner space is reducible for diagnosis of liquid losses, and an evaluating unit, which serves during diagnosis for registering a pressure measured by said pressure sensor as a function of volume reduction of said test element, and, on the basis of pressure measured as a function of volume reduction, detects whether liquid has escaped.