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Re: Flow Monitors
I used acoustic meters for open channel agricultural purposes. I have used the American Sigma 910, Unidata Starflow, Rocky Mountain Florat, Mace Agriflo and MGD ADFM. I also used the Global Water, MM Flo Mate and Sontek FloTracker for point velocity. I tried the Sontec River Surveyor and was very pleased with it's ability.
The only true profiler is the MGD and uses RDI technology which is now Teledyne. The American Sigma and Unidata Starflow (1 mHz blast) are very similar, except Sigma is Windows based and the Starflow is DOS based. The American Sigma is now sold by Hach and is a versatile unit. Based on some input ,Sontek designed its newer shallow water units using YSI technology. I have since gotten out of accoustic meters and specialized in low-end fabricated structures for accurate flows.
For pressure transducers try the Druck or INW PT2X.
On the larger structures we have Accusonics. To calibrate radial gates I have used the MGD, however if the water is too turbid it will not output a depth, due to too many depth returns.
If you just want data from the MGD and cannot sacrifice the long upload time to, use a separate external datalogger like the HOBO.
The ITRC at Cal Poly SLO has published results on studies they have conducted with various dataloggers, pressure tranducers, bubblers and level sensors.
For open channel, I will take a long throated flume with a level from a Milltronics Probe and Winflume formula in a Dryden R2 datalogger any day. If you have partial pipe applications smaller than 10" diameter, Good Luck.
Victor
IID-IMMU
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