초록 ▼

An air filter cleanness gauge is provided. The gauge in a preferred embodiment includes a transparent cover. The housing has a first opening for fluid communication with the atmosphere and a second opening having fluid communication with a fluid source exposed to a filter. A vane is pivotally connec

An air filter cleanness gauge is provided. The gauge in a preferred embodiment includes a transparent cover. The housing has a first opening for fluid communication with the atmosphere and a second opening having fluid communication with a fluid source exposed to a filter. A vane is pivotally connected within the housing and provides a pressure boundary between the first and second openings. Movement of the vane indicates a change in pressure differential between the atmosphere and the fluid source, thereby indicating a need to change the air filter.

대표청구항 ▼

[ I claim:] [1.] A fluid filter cleanness gauge comprising:a housing with a translucent cover, said housing having a first opening into said housing for fluid communication with a fluid source at a first pressure, said first opening having a variable orifice, and said housing having a second opening

[ I claim:] [1.] A fluid filter cleanness gauge comprising:a housing with a translucent cover, said housing having a first opening into said housing for fluid communication with a fluid source at a first pressure, said first opening having a variable orifice, and said housing having a second opening spaced away from said first opening, said second opening having fluid communication with a second fluid source exposed to a filter at a second pressure; anda pivotal vane mounted within said housing providing a pressure boundary between said first and second openings wherein a pressure differential between said first and second pressure sources causes said pivotal vane to pivot to indicate said pressure differential.