Molten sulfur pump vibration and temperature sensor for enhanced condition monitoring

A method comprising:

• introducing a vertical molten sulfur pump assembly comprising:
• a top portion adjacent to a first end of the vertical molten sulfur pump assembly and a bottom portion adjacent to a second end of the vertical molten sulfur pump assembly;
• a pump motor disposed in the top portion;
• an impeller disposed in the bottom portion within an impeller casing;
• a shaft disposed within a central column and connecting the pump motor with the impeller;
• and
• a pump inlet at the second end below the impeller casing;
• attaching a vibration sensor on an external surface of the bottom portion of the vertical molten sulfur pump assembly, on or proximate to the impeller casing and the pump inlet, the vibration sensor comprising:
• a substrate comprising a polymer;
• a resonant layer disposed on a surface of the substrate and comprising an electrically conductive nanomaterial;
• immersing the pump inlet and the impeller casing in molten sulfur;
• pumping the molten sulfur into the inlet and upwards through a discharge passageway by rotation of the impeller;
• measuring, by an infrared temperature measurement camera disposed exterior to the vertical molten sulfur pump assembly, a current temperature of the molten sulfur proximate to the pump inlet;
• transmitting, by a radio frequency interrogator and while pumping the molten sulfur, a radio frequency signal;
• receiving, by a radio frequency resonance detector, a resonant response in response to the radio frequency signal, the resonant response produced by the resonant layer of the vibration sensor.