Level measurement of process fluid using a remote seal

摘要

An apparatus is provided for measuring level of a process fluid in a container opening. The apparatus includes a remote seal configured to be inserted into the container through an opening and configured to receive a pressure related to the level of process fluid in the container. A capillary tube filled with a fill fluid extends from the remote seal to the opening and is configured to convey the pressure therebetween. A pressure sensor coupled to the capillary tube senses the pressure from the capillary tube and responsively determines the level of the process fluid in the container. The remote seal includes a bellows portion arranged to isolate the process fluid from the fill fluid in the capillary tube and convey the pressure therebetween.

主权项

1. An apparatus for measuring level of a process fluid in a container, the container having an opening, the apparatus comprising:
a remote seal configured to be inserted into the container through the opening and configured to receive a pressure from the process fluid related to the level of process fluid in the container; a capillary tube filled with a fill fluid which extends from the remote seal to the opening in the container and configured to convey the pressure therebetween; and a pressure sensor coupled to the capillary tube configured to sense the pressure from the capillary tube which is related to level of the process fluid in the container; wherein the remote seal includes a bellows portion arranged to isolate the process fluid from the fill fluid in the capillary tube and convey the pressure therebetween, the remote seal further includes a seal body contained at least partially within the bellows portion configured to reduce a volume of fill fluid carried in the bellows portion.