Differential pressure principle non-contact liquid level sensor

The invention relates to the technical field of liquid level measurement, in particular to a differential pressure principle non-contact type liquid level sensor, the surface of an air chamber is fixedly connected with an air pipe, according to the principle that air pressure in a closed space is equal, different liquid levels are adopted for dividing the closed space into a plurality of closed spaces, and the liquid level detection function is achieved; the liquid level sensor not only can detect pure liquid with constant density, but also can detect non-pure liquid with uncertain density, such as a solid-liquid mixture, is particularly suitable for occasions with relatively high requirements on the relative detection precision of the liquid level in a mixed dirt discharge container, and well solves the problems that a contact type liquid level sensor is high in failure rate and low in detection precision. The liquid level sensor solves the problem that a conventional non-contact liquid level sensor cannot be installed due to a special use environment, is simple in structure and is not in contact with liquid to be detected, so that the production cost of the sensor is reduced, product faults caused by solid-liquid mixing are avoided, the product reliability is greatly improved, and the product quality is improved. And the use and maintenance cost of the product is greatly reduced.