Self-diagnostic gas density relay and use method thereof

A self-diagnostic gas density relay, comprising a gas density relay body, a gas density detection sensor, at least one diagnostic sensor, and an intelligent control unit;

• the gas density relay body comprises:
• a housing, and a pressure detection element, a temperature compensation element, a signal generator, and a signal action mechanism which are arranged in the housing;
• the gas density detection sensor is communicated with the gas density relay body, and used for acquiring a pressure value, a temperature value, and/or a gas density value;
• the diagnostic sensor is arranged in the housing of the gas density relay body, and configured to acquire deformation quantities of components that generate deformations, and/or positions or displacement quantities of components that generate displacements when the pressure changes, or the temperature changes, or the gas density changes in the gas density relay body;
• and
• the intelligent control unit is respectively connected with the gas density detection sensor and the diagnostic sensor, receives data acquired by the gas density detection sensor and/or the diagnostic sensor, and diagnoses whether a current working state of the gas density relay body is normal or not by judging whether the deformation quantities, and/or the positions, and/or the displacement quantities are within preset thresholds or not, or by comparing the deformation quantities, and/or the positions, and/or the displacement quantities with preset standard values corresponding thereto;
• or, the intelligent control unit uploads the received data to a background, and the background diagnoses whether the current working state of the gas density relay body is normal or not by judging whether the deformation quantities, and/or the positions, and/or the displacement quantities are within the preset thresholds or not, or by comparing the deformation quantities, and/or the positions, and/or the displacement quantities with preset standard values corresponding thereto.