Patent ID: 7287426
Filing Date: 2007-10-30
Classification: G01F

Abstract:
1. A liquid level indicator operable to determine the level of liquid within a container under ambient conditions using ambient temperature measurements, the indicator comprising: a plurality of temperature sensors for making said ambient temperature measurements and each providing an output corresponding to the ambient temperature measurement, said sensors being spaced apart from one another; a processor operable to process the output of at least two of the temperature sensors and provide an output corresponding to the processed output of the temperature sensors corresponding to the ambient temperature measurements; and an indicator for providing an indication of the liquid level within the container in response to an output of the processor; wherein the processor is operable to respond to a difference between the outputs of the temperature sensors corresponding to the ambient temperature measurements, wherein the processor is operable to respond to at least one of the temperature sensors indicating that the ambient temperature is falling with time, and wherein the processor is operable to compare the difference between the outputs of the temperature sensors corresponding to the ambient temperature measurements against a pre-set temperature condition.