Clogged filter indicator

Details Clogged filter indicator Clogged filter indicator

1993-02-22

1994-09-27

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340626, 116DIG25, G08B 2100

Patent

active

053510356

ABSTRACT:
A self-contained sensing unit to be mounted on air duct between the filter and blower to monitor the condition of the filter. The sensor has a probe to be inserted into the duct downstream of the filter. The probe is in fluid communication with a bellows. When the filter becomes clogged, a negative pressure in the duct actuates the bellows which in turn closes a circuit from a battery to a signaling device.

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patent: 4610703 (1986-09-01), Kowalczyk
patent: 4702753 (1987-10-01), Kowalczyk
patent: 4751501 (1988-06-01), Gut

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