Emerson Exchange 365

In reply to Suvadeep:

Hi Suvadeep,

The Rosemount Annubar(TM) averaging pitot tube will provide a reliable and accurate measurement, with easy installation in a rectangular duct: www.emerson.com/.../rosemount-485-annubar-primary-element

Sizing for this installation can be done with Toolkit, which is a free download if you do not already have it: www.emerson.com/.../about-sizing-and-selection-tools

Best Regards,
Dan

In reply to Suvadeep:

You are correct in that the values referenced are a multiplier of pipe diameters. For duct installations we always recommended a site review or drawing review by a local Rosemount representative since ducts can have more challenging flow disturbances than pipes which might include internal bracing, heat exchangers, straightening vanes, filters or other equipment.

If the duct is free of these disturbances, you can generally follow the recommendations in the reference manual. We always recommend mounting the Annubar flow meter across the widest part of the duct, and this should be used for you straight run calculation as well. For a single elbow (out of plane), we recommend 10 diameters (or 12 m) upstream and 4 diameters (4.8 m) downstream.

If you have pictures or drawings available to review for this application, I'd be happy to take a look at it in more detail for you. I can be reached directly at dan.cychosz@emerson.com.

Thank you,
Dan