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  1. #1
    Join Date
    Sep 2005
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    Curious about a tool...

    Saw one of these marked down at Johnstones last week... I am not familiar with it...

    http://www.fieldpiece.com/products/d...r/anemometers/

    Please excuse my lack of understanding... however:

    Can someone measure CFM's in a supply plenum or a return plenum with this gadget?

    Was thinking this would be an easy way to determine the CFM's actually going through a system.

    THX for any input!

    GA
    Ga-HVAC-tech

    Your comfort, Your way, Everyday!

  2. #2
    Join Date
    May 2009
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    Cumming, GA
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    I don’t see a pic GA. What tool is it?


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  3. #3
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    Jul 2017
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    It sure reads that way.

    The 2nd is there to protect the 1st. DTOM

  4. #4
    Join Date
    Feb 2011
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    Georgia
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    Hot wire anemometer you have to traverse the duct with it.

  5. #5
    Join Date
    Sep 2005
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    Thread Starter
    Yeah... it does...

    I have a mini rotating vane Anemometer... (did I spell that right )... and a dual port micron gauge with Dwyer pitot sensers (the former is good for vents, the latter for static pressure)...

    What I was thinking: Something that could be placed into a return stack coming down the side of the furnace (before the air filter), or into the supply plenum just above the coil box...
    To determine the actual CFM's that are being pushed.

    That bit of information seems it would help in many ways.

    THX again for any input!

    GA
    Ga-HVAC-tech

    Your comfort, Your way, Everyday!

  6. #6
    Join Date
    Sep 2005
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    Thread Starter
    Quote Originally Posted by chrisevansac View Post
    Hot wire anemometer you have to traverse the duct with it.
    Can you be a bit more thorough with that explanation?
    I understand what traversing a duct means...
    What would be the procedure, say, for a vertical downflow return stack next to the furnace/coil...
    To determine the CFM flow going through it.

    THX
    Ga-HVAC-tech

    Your comfort, Your way, Everyday!

  7. #7
    Join Date
    Nov 2014
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    Northern Idaho
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    There's good videos on YouTube demonstrating the tool


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  8. #8
    Join Date
    May 2009
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    Cumming, GA
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    I have the STA2 and it’s good for specific applications. Hot wire anemometers work best when there is a longer straight piece of duct to test in. Otherwise, the air is to turbulent and can mess with the readings.

    I recently got a hold of the CPS Easy Hood and love it. I find this is a much better way to capture airflow for about the same price as the STA2.


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  9. #9
    Join Date
    Aug 2001
    Location
    Pavilion, NY
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    I have the sta and it is probably my favorite tool. Very easy to do a duct traverse and if you use it frequently it will open your eyes to just how many systems are under performing due to lack of airflow. Trutech has a good sheet on how to do a traverse and i think jim b did a great video for it several years ago.

    'The more you know, the more you realize you don't know'
    ...

  10. #10
    Join Date
    Feb 2011
    Location
    Georgia
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  11. Likes Ga-HVAC-tech liked this post
  12. #11
    Join Date
    Feb 2011
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    I know the picture is hard to see but you need to create a grid. The guy in the pic has 4 holes and he is getting 4 different readings from each hole. One near the back, the second a quarter closer, and so on.

  13. #12
    Join Date
    Aug 2001
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    https://youtu.be/6mWOnU9rT_g

    'The more you know, the more you realize you don't know'
    ...

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