Measuring and testing – Volume or rate of flow – Using differential pressure
Reexamination Certificate
2007-02-20
2007-02-20
Thompson, Jewel (Department: 2855)
Measuring and testing
Volume or rate of flow
Using differential pressure
Reexamination Certificate
active
11084607
ABSTRACT:
The detector for monitoring decrease in air flow rate due to air filter clogging. It is based on combination of three essential components: the air flow sensor, a threshold detector and an indicator. The air flow sensor is built in form of a novel thermo-anemometer which contains a thermistor, a heating element, and a thermal insulator. Temperature of the sensor is maintained above the air temperature by a constant value by means of an electronic servo circuit. The threshold detector is implemented either in a hardware or software. A novel design of a thermo-anemometer (closely related to a hot wire anemometer) automatically compensates for variations in the air temperatures. The thermo-anemometer triggers the threshold circuit when air flow rate drops below a preset level. For reduction of power consumption, the detector may employ two additional sensors: one is for detection of the blower operation and the other is a presence detector to enable the alarm in presence of people to perceive the alarm. The device automatically calibrates itself upon installation of a new or cleaned air filter. The applications include residential and commercial air conditioners, air heaters, internal combustion engines, vacuum cleaners and other systems where air filters are employed.
REFERENCES:
patent: 5299594 (1994-04-01), Lord et al.
patent: 5706191 (1998-01-01), Bassett et al.
patent: 6544309 (2003-04-01), Hoefer et al.
patent: 6582295 (2003-06-01), Abouchaar
Fraden Jacob
Rutstein Alex
CleanAlert, LLC
Thompson Jewel
LandOfFree
Clogging detector for air filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Clogging detector for air filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clogging detector for air filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3863103