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OT Air purifiers, how do they tell when to change the filter?

Discussion in 'Electronic Design' started by John Doe, Oct 4, 2012.

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  1. John Doe

    John Doe Guest

    In my case, I'm talking about a $100 air filter/purifier. The
    light turns yellow, then red, depending on how clogged the air
    filter is. Are they using motor current to determine that?

    I would like to use my own custom filters. If they used motor
    current, that will let me determine whether my filters allow
    enough airflow.

  2. I suspect it simply be a really long timer. I have a whirlpool AP450 I've
    been tempted to open to examine. It has a light that goes on when it's
    time to replace the $80 HEPA filter.
  3. Dennis

    Dennis Guest

    Commercial air handling system use differential pressure sensors or flow
    measurement. Most home/consumer products use a timer. In fact on my home
    thermostat you can set the timer reminder interval depending on the
    filter type.
  4. gregz

    gregz Guest

    I got a bunch of used Holmes air cleaners I got on eBay. I wanted these
    because it's easy to configure your own. I buy charcoal media cheap in
    bulk. I use various polyester electrostatic media. It's got a thumwheel
    knob on top, which looks strictly manual for month. I guess your supposed
    to keep track. HEPA filters are high restriction when clean. Some more
    costly multi filter cleaners change speed monitoring room pollution, so I
    suppose some measure differential pressure to change filters.

    Mine HP2400

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