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Air flow meter
snwcmpr
Any one use, and/or know where to get a reasonably priced air flow meter to attach to the intake of the blower for a permanent reading of CFM?
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Backwoods Roaster
"I wish I could taste as well as I wish I could roast."

As Abraham Lincoln said "Do not trust everything you read on the internet".
coffeeforblood
I have looked around, but "reasonably priced" is usually the stumbling block. Those things exist, but they are not cheap.
oldgearhead
Flow rate is a factor of air-speed through a known diameter tube. However, it requires a simple calculation to convert air-speed to flow rate. Air-speed (anemometer) meters are inexpensive. ($12 USD).
Will your configuration work with an anemometer?
No oil on my beans...
renatoa
Model plane hobby anemometers - $19 - can be used, if max 30m/s is enough airflow:
https://hobbyking.com/en_us/turnigy-mini-anemometer-wind-meter.html
https://hobbyking.com/en_us/hobbyking-digital-anemometer.html
oldgearhead
..for the conversion and calculations go to:

http://www.1728.o...owrate.htm

Two examples pics :
oldgearhead attached the following image:
dsc_7664_1.jpg

No oil on my beans...
snwcmpr
I guess I should clarify. The key word is attach.
I don't want to measure the wind.
I just want to read the air coming into the fan. It is a vacuum cleaner fan with a hole, I'll have to look, but IIRC about 1 1/4 - 1 1/2 ???
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Backwoods Roaster
"I wish I could taste as well as I wish I could roast."

As Abraham Lincoln said "Do not trust everything you read on the internet".
oldgearhead

Quote

snwcmpr wrote:

I guess I should clarify. The key word is attach.
I don't want to measure the wind.
I just want to read the air coming into the fan. It is a vacuum cleaner fan with a hole, I'll have to look, but IIRC about 1 1/4 - 1 1/2 ???

Then you can forget lower prices and look at the various 'hot wire' units at $165 and up.
No oil on my beans...
renatoa
Why, the hole of anemometers is is in the same ballpark, about 3-4 cm... ?
oldgearhead
If you are talking about a vane (prop) anemometer, they come in various size props.
'Hot wire' type use a voltage across a wire to determine many different things air speed and mass flow are two types, but yes 'hot wire' meters tend to have the same size hole cutout for the 'hot wire'..
No oil on my beans...
snwcmpr
Thanks I will look.

If I see them correctly, the hand held ones, with a vane, when mounted on the roasters fan, would have the display on the back side of my roaster, where I cannot see it.
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Backwoods Roaster
"I wish I could taste as well as I wish I could roast."

As Abraham Lincoln said "Do not trust everything you read on the internet".
oldgearhead
There a two basic types the hot wire type for flow, temperature, air speed.
and the propeller type for air speed and/or temperature. Either type may be or may not have a way to remote it ($$$). The prop type is the most difficult to remote because it usually requires a mechanical cable but the hot wire ones are electronic wire...
No oil on my beans...
snwcmpr
That is what I have been seeing so far in my search. They all seem to have telescoping probes.

Still searching.
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Backwoods Roaster
"I wish I could taste as well as I wish I could roast."

As Abraham Lincoln said "Do not trust everything you read on the internet".
oldgearhead
I've installed industrial flow transmitters (4-20 ma) by Rosemount, Dwyer, Emerson, Hoffer, and etc. Usually the need is water, but they are available for gas. Very large, expensive, and you need something like a PLC to connect them to...
No oil on my beans...
oldgearhead
..and here is one of the simple ones. Remember, you must provide a way to read it. A hot wire sensor of this type only reads at the tip. The wand and extension are for reading in like in an air duct. With this type you must know the range you want to read because they are built for a certain range. This one is 0-2000 fpm.
My birthday is coming up and this one is perfect for my needs.
www.ebay.com/itm/...EBIDX%3AIT
Edited by oldgearhead on 02/12/2017 8:47 AM
No oil on my beans...
snwcmpr
That's cool, but I don't have a way to calibrate or test.
--------------
Backwoods Roaster
"I wish I could taste as well as I wish I could roast."

As Abraham Lincoln said "Do not trust everything you read on the internet".
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