Contamination increases with fan speed as the insides of the product are exposed to more contaminant gas molecules. Highest fan speed would lead to data which unquestionably documents compliance. Therefore the easiest thing to do is to run at full speed.
A case could be reasonably made to run the fans at the average speed expected over the 20-25 year life of the product. A reasonable point to pick in the absence of other data would be the fan speed at the highest "normal" temperature in the CO of 40C. While temperatures of up to 50C may be encountered, they are limited to a small number of hours per year. Note that you should consider the effects of internal heating on any fan sensor that may be imbedded in the product (i.e. measure the fan speed after the full loaded product has come to temperature equilibrium). MFG Chambers run at 30C, so it may be necessary to do some experiments on variable speed fans to determine where to set the fan speed. Jon Curtis "Violette, David" wrote: > Can anyone tell me what fan speed they have used during the GR-63 Mixed Flow > Gas test and why? I have run tests with fans at full and reduced speeds and > would like to hear what others have done and are doing for this test. The > more replies to this query the better. > > Thanks in advance, > David Violette > dviol...@ciena.com -- Jon D. Curtis, P.E. Director of Engineering Curtis-Straus LLC One Stop Laboratory for NEBS, EMC, Product Safety, and Telecom Testing. 527 Great Road Littleton, MA 01460 USA Voice 978-486-8880 Fax 978-486-8828 email: jcur...@curtis-straus.com WWW.CURTIS-STRAUS.COM
