Thread: Clearvue Noise Problems - Take 2

Originally Posted by Flindersia

Something like the sketch attached. May need to make the openings between baffles a little larger than 100x300mm.

Attachment 446878

This was how I made mine but you will only need 2 baffles not 4 and I installed them starting further from the inlet and outlet points. I’ll get the measurements of the box I made a little later when I’m in the shed.

How did you go with this?

For a number of reasons, I can't enclose my entire CV1800. Any ideas on how much noise attenuation I could get by enclosing the filters?
This is an indoors installation.

P.S. any help on my post of yesterday on Magnehelic gauge install?

Originally Posted by blackhorse16a

P.S. any help on my post of yesterday on Magnehelic gauge install?

https://www.youtube.com/results?sear...e+installation

Originally Posted by blackhorse16a

For a number of reasons, I can't enclose my entire CV1800. Any ideas on how much noise attenuation I could get by enclosing the filters?
This is an indoors installation.

P.S. any help on my post of yesterday on Magnehelic gauge install?

Have you checked with other ClearVue users at the ClearVue forum?
Forums - Clear Vue Cyclone Forums

https://www.youtube.com/results?sear...e+installation

I scanned almost all of those videos; none answered my question. Simply put, is the static pressure just before the filter, after the impeller, lower or higher than ambient SP?

Static pressure after the impeller should be higher because it is pushing the air into the filters which, even when clean, will have some resistance. As they get dirty the pressure will go up and I think when they get to be 2" to 3" higher than the clean filters were then it's time to clean them. Contact CV or Wynn to confirm.

Pete

Originally Posted by blackhorse16a

https://www.youtube.com/results?sear...e+installation

I scanned almost all of those videos; none answered my question. Simply put, is the static pressure just before the filter, after the impeller, lower or higher than ambient SP?

I understand your frustration but very few if any installations in Oz would have a Magnahelic and we as a rule don't use filters with a few exceptions. Some owners are using a manometer but again no filters. Sorry for the bum lead.

No worries, Chris. I wish I could bypass the filters, but not in my neighborhood. I'll just try it both ways and see which gives a positive reading. Thanks again.

My understanding is they are used to measure pressure changes across the filter to check for filter condition. In that case one port would be before the filter and the other port after the filter.
I’ m going on what I know regarding the Dwyer units.

Yes, the idea is to measure the pressure difference change over time to see when your filters are clogging. So, in this case, you would leave one port open to the ambient atmosphere and hook the other to a hole in the CV 1800 90 deg. transition, just before the filter. Then log the change over time.

When I was talking to Dwyer they said that there is always some pressure, caused by some resistance, in the tubing/ducting after the filter, even though it may be very small.
This is why they recommend connecting before and after the filter in he actual ducting, rather than comparing to atmospheric pressure if you want accuracy.

https://www.baghouse.com/2014/06/02/...essure-sensor/

First off, apologies to the thread originator for hijacking. Happy to cease if he/she wants to recover it.

Lappa, Dwyer seems to be talking about air handling HVAC applications. I have nothing after the filters. Also i think they're talking about measuring actual pressure, when all I want is to measure the change (∆P). I have contacted the link you posted and will post response here.

So, if you have no ducting after the filters then the second connection can go straight to to atmosphere, as you said.
As they are differential gauges, measurement from the two ports gives the difference between each pressure therefore an indication of filter blockage.