DO meters based on fluorescence quenching (optical method)

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Can anyone inform me about Dissolved Oxygen (DO) meters based on fluorescence quenching (optical method), reliability and accuracy?

Much appreciated.

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I have used these types of ...

I have used these types of meters in the Oil Sands SAGD space on waters that would fouled typical polarographic/membrane based probes very quickly.

The technology is well developed and reliable. We typically use these types of instruments to measure low ppb (

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