Pressure transmitters with flush diaphragms have long been the standard solution for pressure measurement in sterile pharmaceutical and biotechnology processes. They reliably separate the process medium from the measuring system while fulfilling stringent hygienic design requirements. However, a critical risk remains largely overlooked: if the process diaphragm is damaged or ruptures, the pressure sensor may continue to provide plausible measurement values. As a result, the failure can remain undetected while process medium, fill fluid, and cleaning media potentially mix, compromising product quality, process integrity, and regulatory compliance.

A pressure transmitter incorporating an integrated diaphragm monitoring system was developed for critical sterile applications. The design employs a double-diaphragm arrangement with an evacuated interspace between the primary process diaphragm and a secondary protective diaphragm. Continuous monitoring of the vacuum condition enables immediate detection of any perforation or rupture of the process diaphragm.