Tubular level indicator is a reliable device for reading the level of liquid. It is a simplest form of level indicator. This level indicator finds wide application for level measurement in process tanks, and batching tanks.

Tubular membranes are not self-supporting membranes and they are classified as tubular, capillary and hollow fiber membranes. They are located on the inside of a tube, made of a special kind of material. This material is the supporting layer for the membrane. As the location of tubular membranes is inside a tube, the flow in a tubular membrane is usually inside out. The main cause for this is that the attachment of the membrane to the supporting layer is very weak. Tubular membranes have a diameter of about 5 to 15 mm. As of the size of the membrane surface, plugging of tubular membranes is not likely to occur.

Tubular metallic O-ring seals are designed to provide a high sealing level under adverse working conditions whether the medium is gas or liquid. These are constructed of stainless steel or high temperature alloy tubing or wire. These are available in various sizes ranging from 1/4″ to 315″.