Air filter restriction indicating device

Details Air filter restriction indicating device Air filter restriction indicating device

1995-02-24

1998-12-15

Mullen, Jr., Thomas J.

Communications: electrical

Condition responsive indicating system

Specific condition

340606, 340611, 454158, 454146, G08B 2100

Patent

active

058501835

ABSTRACT:
An air restriction indicating device for measuring very low ranges of filter restriction (e.g., on the order of 0.0 to 1.5 inches of H.sub.2 O or 0.0 to 0.54 psi) in a micronfilter used in vehicular heating/ventilation/air conditioning (HVAC) systems. The indicating device includes a housing that is separated into two sub-chambers by a flexible diaphragm. A indicating member is carried by the diaphragm so that the diaphragm and the indicating member move, within the housing, responsively to changes in the pressure of the air flowing in the HVAC system caused by restrictions in or clogging of the micronfilter. To facilitate reading, the indicating device also includes structure that progressively locks the diaphragm and indicating member in position.

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