A system for detecting a flow restriction in a drainage pipe and a liquid level sensor module for sensing the liquid level in a pipe

Abstract

A system for detecting a flow restriction in a drainage pipe with two liquid level sensors (10) one on each side of an inlet (7) to output a liquid level signal. A controller C compares the signals indicates a restriction if the signals differ too much. A liquid level sensor module (8) for sensing the liquid level in a pipe, having a circular body (17) releasably retained and to sealed in a port (14). The body (17) supports a liquid level sensor (10) to sense the liquid level. The module may be in a T shape housing. A condensate drain pump system with a pipe manifold has an inlet duct (31) at the top connected to a condensate outlet O and leading to a transverse outlet duct (32) with a liquid level sensor (10) at one end and a pump P at the opposite end to pump out liquid when the sensed level is too high.

Dependencies are inferred from the claim text.