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Replace Furnace Air Filter
QUESTION:I'm looking for a sensor to use for monitoring the air flow resistance
across the filter media in a furnace. Typical values are 0.10 inches
w. c. (= water column ?) when new rising to 0.50 when replacement
should occur. Is there a device whose output is directly (or easily
scaled) in these units ? My thought is to drill a small hole in the
cold air return ducts on either side of the filter and measure
differentially with a sensor. Suggested sensors or circuits ?
ANSWER: Yeah- He's the first person who's ever had to monitor filter resistance ?!
Go to Dwyer Instruments http://www.dwyer-inst.com and check out the air
filter monitor gauges Mark II series. The economy Model 25 handles 0-3 "
w.c. with 3% FS accuracy, is intended for permanent installation, and priced
to sell. It is a manometer. If electrical output is a requirement [ to sound
an alarm no doubt] then Dwyer also caries several adjustable differential
air pressure switches. If you go to an electronic or other gauge then get
ready to spend big bucks.
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