Pressure gauge comprising a device for deflecting an isolation diaphragm

A pressure gauge, comprising:

• a pressure sensor;
• and
• a pressure transmitter connected upstream of the pressure sensor, the pressure transmitter including:
• an isolation diaphragm under which a pressure receiving chamber is enclosed,
• a hydraulic pressure transmission path connected to the pressure receiving chamber and filled with a pressure transmitting fluid, wherein the hydraulic pressure transmission path is embodied to transmit a pressure acting on an outer side of the isolation diaphragm to the pressure sensor, and
• an electronically activatable deflection device designed such that, when activated, the deflection device exerts a constant force on the isolation diaphragm or on an element connected to the isolation diaphragm to deflect the isolation diaphragm.

A method for testing a function of a pressure gauge, the method comprising:

• providing the pressure gauge, the pressure gauge including:
• a pressure sensor;
• and
• a pressure transmitter connected upstream of the pressure sensor, the pressure transmitter including:
• an isolation diaphragm under which a pressure receiving chamber is enclosed,
• a hydraulic pressure transmission path connected to the pressure receiving chamber and filled with a pressure transmitting fluid, wherein the hydraulic pressure transmission path is embodied to transmit a pressure acting on an outer side of the isolation diaphragm to the pressure sensor, and
• an electronically activatable deflection device designed such that, when activated, the deflection device exerts a constant force on the isolation diaphragm or on an element connected to the isolation diaphragm to deflect the isolation diaphragm;
• and
• performing a functional test of the pressure gauge, wherein the functional test includes:
• activating the deflection device for a predetermined time period;
• measuring a pressure via the pressure sensor;
• and
• checking the function of the pressure gauge based on a sudden pressure change caused by the activation of the deflection device and measured during the functional test by means of the pressure sensor or based on a time curve of the pressure measured during the functional test by means of the pressure sensor.