Sensor device for monitoring a water electrolysis installation, to be placed inside a fluid of the water electrolysis installation, related installation and method

A sensor device for monitoring a water electrolysis installation, to be placed inside a fluid of the water electrolysis installation, the device comprising:

• at least one optical fiber probe having a sensing region to be placed inside the fluid;
• a light source apparatus providing an input light to the optical fiber probe;
• a processing apparatus for processing an output light emitted by the optical fiber probe after receiving the input light from the light source apparatus;
• and
• a temperature sensor and/or a pressure sensor located in the vicinity of the sensing region to measure a temperature and/or pressure of the fluid in contact with the sensing region, the temperature sensor and/or pressure sensor being connected to the processing apparatus for processing simultaneously the output light and the measured fluid temperature and/or pressure.