Patent ID: 7392699

Claim:
A method for installing an apparatus for use in measuring fluid levels in a container by determining the point where an upper fluid contacts a gas or where various stratified fluids contact each other, the container having a bottom and an enclosed top, comprising: screwing generally equal width sensor rod sections having an outer surface together; extending at least one of the sensor rod sections towards the bottom of the container and at least as deep as the lowest fluid level desired to be measured; positioning the outer surface of at least one of the rod sections to be in contact with the upper fluid at the point where the upper fluid contacts the gas; positioning the outer surface of at least one of the rod sections to be in contact with the various stratified fluids at the point where the various stratified fluids contact each other; attaching a sensor head to one of the rod sections; and positioning the sensor head above the enclosed top of the container and externally from the container.