| 摘要 |
PURPOSE: An air cleaner element replacement time alarming device is provided to reduce the inhaling resistance of the air flowed in through a cleaner, and to improve the efficiency by restraining the produce of concentrated mixed air. CONSTITUTION: An air cleaner element(12) replacement time alarm device is composed of:a supersonic sensor(14) installed adjacent to both sides of the air cleaner element to sense the level of pollution of the air cleaner element; an object sensing circuit to convert the frequencies generated from the supersonic sensor into pulses; and a controller to compare the number of pulses detected by inputting the pulses from the object sensing circuit with the predetermined number of standard pulses and then to supply output controlling signal to an alarm part if the detected result is lower than the predetermined standard number of pulses.
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