A process transmitter for measuring a process pressure, the process transmitter comprising: a pressure sensor module comprising a pressure sensor for measuring a process pressure of an industrial process and generating a pressure sensor signal, the pressure sensor module further comprising: a housing containing the pressure sensor; a flexible pressure sensor element disposed within the pressure sensor, a position of which corresponds to a magnitude of the pressure sensor signal; an isolation diaphragm positioned on an exterior of the housing; an isolation tube connecting the flexible pressure sensor element with the isolation diaphragm; and a fill fluid positioned within the isolation tube to influence a position of the flexible pressure sensor element based on a magnitude of the process pressure; a heating device connected to the sensor module for generating a heat pulse to influence generation of the pressure sensor signal, wherein the heating device comprises a plurality of heating devices which are positioned at different locations within the pressure sensor module so as to cause localised thermal expansion of the fill fluid by means of the heat pulse; and transmitter circuitry connected to the pressure sensor and the heating device; wherein the transmitter circuitry verifies operation of the pressure sensor by measuring a change in the pressure sensor signal due to the heat pulse. a pressure sensor module comprising a pressure sensor for measuring a process pressure of an industrial process and generating a pressure sensor signal, the pressure sensor module further comprising: a housing containing the pressure sensor; a flexible pressure sensor element disposed within the pressure sensor, a position of which corresponds to a magnitude of the pressure sensor signal; an isolation diaphragm positioned on an exterior of the housing; an isolation tube connecting the flexible pressure sensor element with the isolation diaphragm; and a fill fluid positioned within the isolation tube to influence a position of the flexible pressure sensor element based on a magnitude of the process pressure; a housing containing the pressure sensor; a flexible pressure sensor element disposed within the pressure sensor, a position of which corresponds to a magnitude of the pressure sensor signal; an isolation diaphragm positioned on an exterior of the housing; an isolation tube connecting the flexible pressure sensor element with the isolation diaphragm; and a fill fluid positioned within the isolation tube to influence a position of the flexible pressure sensor element based on a magnitude of the process pressure; a heating device connected to the sensor module for generating a heat pulse to influence generation of the pressure sensor signal, wherein the heating device comprises a plurality of heating devices which are positioned at different locations within the pressure sensor module so as to cause localised thermal expansion of the fill fluid by means of the heat pulse; and transmitter circuitry connected to the pressure sensor and the heating device; wherein the transmitter circuitry verifies operation of the pressure sensor by measuring a change in the pressure sensor signal due to the heat pulse.