Patent ID: 6239694
Filing Date: 2001-05-29
Classification: B01D,B60H

Abstract:
A warning device for warning a change time of a filter for cleaning air, the warning device comprising:a warning indication unit which indicates a warning of the change time of the filter; anda control unit for controlling operation of the warning indication unit, wherein:the control unit includestimer means which adds filter-using time for which air passes through the filter,setting means for setting an end setting value of the timer means,resetting means for outputting a resetting signal for resetting the timer means when the filter is changed, andchanging means for changing the end setting value of the timer means to a first revised value based on the filter-using time until a change of the filter;the changing means resets the timer means when the resetting signal is output from the resetting means; andthe control unit operates the warning indication unit when the filter-using time passes the end setting value.