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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.

  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.

    Thanks
     
  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

    Greg
     
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