Non-linear noise analysis from a capacitive pressure transmitter

Abstract When the capacitive pressure transmitters—Rosemount type—experience a silicone oil-loss from its inner structure, they do not behave as a linear dynamical system. Such an anomaly is reflected on the noise signal. In this work, a non-linear model for the sensor and the sensing line is defined. It explains the main features of the noise signal as measured in service and in the laboratory.