초록 ▼

An apparatus for monitoring the condition of a fluid filter comprises a flexible diaphragm exposed to the upstream, downstream or differential pressure acting on the filter and indicator means for monitoring the condition of the filter as a function of movement of the diaphragm in response to said p

An apparatus for monitoring the condition of a fluid filter comprises a flexible diaphragm exposed to the upstream, downstream or differential pressure acting on the filter and indicator means for monitoring the condition of the filter as a function of movement of the diaphragm in response to said pressures. A unique, low friction indicator mechanism, means for adjusting the sensitivity of the device and means for resetting the device are also disclosed.

대표청구항 ▼

Apparatus for indicating the condition of a filter in a forced air system comprising: a base member; an enclosed chamber mounted on said base member, one wall of said chamber comprising a flexible diaphragm having an interior surface within said chamber and an exterior surface; means operatively ass

Apparatus for indicating the condition of a filter in a forced air system comprising: a base member; an enclosed chamber mounted on said base member, one wall of said chamber comprising a flexible diaphragm having an interior surface within said chamber and an exterior surface; means operatively associated with said base member for directing fluid pressure from either the upstream or the downstream side of said filter to either the interior or the exterior side of said diaphragm; an elongated arm mounted to pivot relative to said base member; means for pivotally connecting said arm to said flexible diaphragms; indicator flag means mounted for rotation relative to said base member, said elongated arm contacting said flag means to cause rotation thereof in response to movement of said diaphragm due to changes in the pressure in said system; and means connected to said indicator flag means for resisting movement of said flag means from a first position indicative of a clean filter until said arm has rotated said flag means a predetermined amount in response to said changes in pressure, and for aiding movement of said flag means to a second position indicative of a dirty filter after said flag means has moved said predetermined amount.