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  1. #53
    Join Date
    Dec 2008
    Posts
    4
    Oh, you wanted the answers

    Well he explained that the EPA index also factors in ozone and other pollutants which are not particulate matter, therefore the rating systems are different. I guess it's like comparing apples and oranges. He did mention that the particle count readout from the DC1100, since it counts each individual particle, would be more precise in measuring particulate matter than the EPA AQI which is a rough guide.

    The DC1100 measures in particles per cubic foot / 100. So when you read the display, multiply by 100 to get the particles per cubic foot. I asked about placing the meter in a windy place, like a car with the windows open. He was a bit surprised that I would be considering that, and he did mention that it needs to be plugged in to a standard 120V outlet, but he said it doesn't matter if wind is blowing into it, the accuracy of the reading wouldn't be affected by that. (To satisfy your curiosity, I was thinking of measuring the air quality near some of our manufacturing plants and agricultural operations in the community) This also implies you could place the meter near a fan without worry.

    As far as which model is best, he said the standard one is generally the choice for home and office uses - unless you're particularly concerned about the smallest particles between 0.5 and 1 micron - or you're a contractor who needs to go by the PM2.5/PM10 calibration standard.

    Edit:
    I might as well mention here that I just ordered one - standard model - can't wait to take some measurements when it arrives! (Hope the results aren't too scary )
    Last edited by jrowell; 12-18-2008 at 08:48 PM.

  2. #54
    Thanks. I knew the AQI included ozone and sometimes other gasses.

    I appreciate the further explanation. The Dylos people seem to know their product and its applications well. I continue to be satisfied with mine.

    Office reading 659 at 1 micron and 1 at 10 microns.

  3. #55
    Join Date
    Dec 2008
    Posts
    4
    I appreciate the further explanation. The Dylos people seem to know their product and its applications well. I continue to be satisfied with mine.
    It did impress me that the person I talked to did seem quite knowledgeable. It was like a breath of fresh air (pun intended). Good to hear that after more than a year you're not experiencing problems with your meter - that bodes well for my experience.

    Well I failed to mention, after talking with Dylos I ordered one of these meters. Since we're both in California it didn't take long, and it arrived just yesterday. Plugged it in and to my surprise the reading was over 1000 for the small particles! Needless to say, I turned on the HEPA air purifier (I had stopped using it since it's so noisy) and within an hour the numbers had gone down to 96/7. I'm not in a particularly sensitive group, but why breathe dirty air? It would be just asking for trouble. My goal now is to keep the number below 100, I figure that's clean enough and I can keep the purifier turned off most of the time.

    The meter includes a bar graph on the second line of the display. This graph apparently shows in real-time what size particles are going through the machine. So when most of the particles in the air are small, the graph stays more toward the left side.

    So, after the first day of use, here's my little review.

    The good:
    • So easy to use, just plug it in and press the "on" button.
    • It comes with a data logging feature built in, allowing you to review the measurement history by the minute (for the last 60 minutes), by the hour (for the last 24 hours), or by the day (for the last 30 days).
    • The data log memory is retained when you unplug the unit to move to a different room (but there is also a function in the menu so you can erase it when desired)
    • The display is an LCD with back light, so it can easily by seen in any lighting condition.
    • It costs much, much less than any other particle counter I've seen, making it accessible to the average consumer. And so far it seems to be accurate and reliable.

    The bad:
    • The menu allowing you to review history by minute, hour, and day is accessed by repeatedly pushing only two buttons - so it takes a fair amount of button pushing to go through the data. Some might like the simplicity, but I would prefer dedicated buttons for "minute", "hour", and day".
    • The bar graph is constantly active, quickly jumping to the right and back, many times a second. I found it annoying. It seems pointless to me, since the numbers at the top tell you all you need to know - but if you're going to have a bar graph, at least make it slow down!
    • The fan is quite audible - not really annoying, but you do notice it.
    • I would prefer if it came in a more attractive enclosure. For something that (to an average homeowner) is not cheap, it does look cheap. I know it's a bargain - but it doesn't have to look that way.

    Feature suggestions:
    • It would also be nice if the display could show all the history at one time, and with graphs - but actually this is already a possibility if you purchase the port option and hook it up to a computer.
    • It would be nice if you could hang it on the wall.

  4. #56
    Good summary and suggestions.

    After using mine for over a year the feature I like best is that it runs all the time. I can check my particle count at any time with just a glance at the unit.

  5. #57

    PM mass vs. particle counts

    In case anyone doesn't know about this difference, I would note that EPA's PM2.5 standards and air quality measurements are in terms of mass not particle counts. So the 24-hour average ambient air quality standard for PM2.5 is now 35 ug/m3 (micrograms of PM2.5 per cubic meter of air). This is different than what the DC1100 measures. The DC1100 measures particle counts.

    Furthermore, EPA's mass measurements count the mass of all particles SMALLER than 2.5 ug (or 10 ug, in the case of PM10). In contrast, the DC1100 counts all particles LARGER than 1 ug (for the Pro version), as I understand it.

    I am interested in finding out how strong the correlation is between PM2.5 mass and the DC1100 readings. I'm sure it would depend upon the size distribution of particles in a particular environment, and there is published literature on how this distribution varies, and on what typical particle counts in various environments are. For example, this paper has examples of urban measurements in both units (mass and particle counts) using more expensive equipment:

    http://www.ehponline.org/members/200...levy-full.html

    EPA has numerous technical documents on particle size composition, etc. in pages linked from here:
    http://www.epa.gov/pm/

    I haven't had time to find a good discussion of the correlation between particle counts above 1 ug and particle mass below 2.5 ug, but I'd be very interested in that information.


    Quote Originally Posted by jrowell View Post
    ...
    Well he explained that the EPA index also factors in ozone and other pollutants which are not particulate matter, therefore the rating systems are different. I guess it's like comparing apples and oranges. He did mention that the particle count readout from the DC1100, since it counts each individual particle, would be more precise in measuring particulate matter than the EPA AQI which is a rough guide.

    The DC1100 measures in particles per cubic foot / 100. So when you read the display, multiply by 100 to get the particles per cubic foot.
    ...

  6. #58
    Join Date
    Feb 2009
    Posts
    4
    Just as a heads-up, since this is a discussion of the DC1100, I'm currently arranging a group buy for the month of February.

    There's more information here:

    Dylos Group Buy Form

    I'm not affiliated with the company in any way but was advised by some woodworking fellows that HVAC people might also be interested in this as well.

    Thanks,
    Charlton

  7. #59
    Join Date
    Feb 2009
    Posts
    4
    Mark,

    I'm not sure if this page has any information that's useful for you. I was made aware of it by some folks over at LumberJocks.

    http://www.carbideprocessors.com/Dyl...Dylos_long.htm

    Charlton

  8. #60
    Join Date
    Feb 2009
    Posts
    4
    Just a reminder that the group buy ends this week. Should you decide to partake, you should do so before Friday.

    Cheers,
    Charlton

  9. #61
    Join Date
    Jan 2010
    Location
    Saint Louis
    Posts
    2

    Dylos DC 1100

    Has anyone used the Dylos DC 1100 for measuring cigarette/toabacco smoke levels infiltrating from neighboring apartment units in a housing complex ?

  10. #62
    Join Date
    Jan 2010
    Location
    Saint Louis
    Posts
    2
    How effective will the Dylos be for Cigarette/tobacco smoke particles ? (I do not know what micron range these fall under).

  11. #63
    Join Date
    May 2005
    Location
    Lubbock Texas
    Posts
    773
    I let the Chief Engineer use mine on the Horseshoe Southern Indiana Casino River boat for a while so he can do data recording on the low particulate size. I had mine re-calibrated to the .5 range for cigarette smoke.

  12. #64

    What particales does it read

    Does the device tell me what the particulate matter IS? Or just that 'particles' exist and how many there are? I want to know if there is mold or ammonia in my air.

  13. #65
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,919
    Quote Originally Posted by cruisepro2 View Post
    Does the device tell me what the particulate matter IS? Or just that 'particles' exist and how many there are? I want to know if there is mold or ammonia in my air.
    No.

    You need to have someone do a mold test.

    A detector to tell if amonia is present will likely cost several thousand dolars and will be specific for that gas.
    Remember, Air Conditioning begins with AIR.

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