National offers a complete line of AST sensors designed to provide high level alarm contacts for above ground storage tanks. All units are fabricated in stainless steel and have a self-checking feature.
Primarily used for “tote” tanks and other installations where electrical indicators are impractical or undesirable, they are available in both metallic or non-metallic versions, and with rigid “sticks” or flexible “tapes”.
A flow switch is a device that can sense actual fluid flow, rather than pressure, in a piping system. Using a flow resisting disc and spring, they can be set up to detect increasing flow, or decreasing flow.