Question about measuring air flow with rotometers.

[Festivito]

Should one use the bottom of the floating ball, middle or, please not, the top of the ball.

I was always taught the bottom of the ball.

What sayest DUers.

[cloudbase]

1. I've heard bottom and middle.

It was explained to me that it really didn't make a difference, as long as you are consistant in your settings. Given that, it probably wouldn't make any difference if you used the top, too. Disclaimer: This was not in any scientific measurement, but in process control.

[Festivito]

4. Thanks. Tomorrow I'll call the manufacturer.

You are correct in that it would make no difference as long as it is consistent. The bottom just seems more a defined point offering more accurate interpolation.

Environmental testing for me.

Checked your website. If you effected to serve our country, let me add greatly more thanks.

[Arctic Dave]

2. I agree with the first post.

I was taught the same thing.

[Festivito]

5. Thanks. Glad to have you here.

You also remind me to call a friend in North Pole.

[SnowGoose]

3. Middle.

That's how they're calibrated, so that's how you should read 'em.

Incidentally, there are rotometers with non-spherical floats (although I've never used one of those). Can't say I've ever seen the word rotometer on DU before. Guess there's a first time for everything.

[Festivito]

6. Next should be digital, nothing to confuse.

I have to wonder what shapes would look fun. Perhaps I'm feeling just what you mean.

Hope you enjoy A-squared land. I miss my youth once spent there.