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That is the only tower I ever tested that overflowed with design GPM. I did test the cooling tower at that theater just outside Dallas but couldn't remember the design wet bulb. I did some dry coolers that were about that size but most of them were for equipment cooling. It was bigger than the tower you described. The smallest HVAC evap cooling tower I tested was 25 ton. Having said that it is pretty much state of the art and should have the manufacturer's stated accuracy you need. The problem with it is that it is time weighted average and doesn't start and stop in the same place during the cycle every time because the cycle is not regular. I'm not familiar with Testo equipment but time weighted all works the same. Time weighted can get you in trouble taking static pressure readings also but normally doesn't unless you have to prove your readings. I would not use them in life safety situations such as railroad crossing control building equipment conditioning. Time weighted digital flow hoods are usually a little high and in some cases unacceptable. When used for duct traverse the results is slightly high but acceptable. The time weighted meter is more accurate when used for duct traverse than the same meter is when used on the digital flow hood. They are less accurate in low pressure systems than in the higher pressure VAV systems. Time weighted average accuracy largely depends on the continuity of mass. Our 20th year anniversary is May 21, 2020.
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