Vacuum cleaner with performance monitoring system

A vacuum cleaner dust bag mount for mounting a dust bag in a vacuum cleaner, said dust bag adapted to receive dirt laden air therein, said bag mount comprising

• mounting means for mounting said dust bag on said bag mount, said mounting means providing an intake air passage between the outside of said vacuum cleaner and the inside of said dust bag,
• pressure sensing air passage means extending through said bag mount and in communication with said intake air passage and
• shroud means in said intake air passage for shielding said pressure sensing air passage means so as to prevent said dirt laden air from entering said pressure sensing air passage means.

A vacuum cleaner condition indicator for use with a vacuum cleaner having an intake port, a dust collecting compartment, a dust bag adapted to be disposed in said dust collecting compartment and a discharge port, comprising

• first sensing means sensing the differential pressure between said intake port and said dust collecting compartment to provide a first sensing signal,
• second sensing means sensing the differential pressure between said discharge port and said dust collecting compartment to provide a second sensing signal,
• third sensing means sensing the differential pressure between the outside of said vacuum cleaner and said intake port to provide a third sensing signal and indicator means associated with said first, second and third sensing means for providing sensorially perceptible indicating signals in response to said first, second and third sensing signals.