Liquid level sensors that are used currently are based on many different theories

but they all have weak points when facing some special situations.With the difference of the heat transfer coefficient between liquid and gas

a new liquid level sensor based on an array of platinum resistors has been developed.The theoretical analysis and experimental results are introduced.The analysis and experiments show that the liquid level measurement based on this sensor is accurate and effective.The sensor can work well in different kinds of liquid after adjusting some parameters.