Erratic draft pressure indication o a heater due to wind

[jrcagle]

I have several pressure transmitters monitoring very low (trasmitters have -3 to 3 inWC range) differential pressure. One side is tubed to the heater box and the other side is reading atmosphere.

The DP reading gets erratic at times and I can correlate this to high wind speed. The atmospheric pressure tubing goes into a piece of 4" PVC piping with several small holes drilled in the sides and bottom. This is intended to reduce effects from wind but is apparently not entirely adequate.

Any recommendations on alternate systems to reduce wind effects?

 

[DRWeig]

http://www.dwyer-inst.com/PDF_files/A-420_iom.pdf

But remember, too, that wind blowing across the top of the flue stack will also disturb the firebox pressure.

You might consider a dampener, whether it's an orifice in the tubing, a baffled cannister, or even a big coil of tubing.

Best to you,

Goober Dave

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[danw2]

pneumatic exhaust muffler, scintered filter, like the foam on a stage microphone: