Can a Dissolved Oxygen (DO) probe be used in an application where Hydrogen Sulfide (H2S) is present?

Document ID

Document ID TE3931

Version

Version 1.0

Status

Status Published

Published Date

Published Date 01/18/2017
Question
Can a Dissolved Oxygen (DO) probe be used in an application where Hydrogen Sulfide (H2S) is present?
Summary
Hydrogen Sulfide (H2S) control and application appropriate DO sensors.
Answer

The considerable amount of greases and oils present in the wastewater stream coats conventional DO sensors, plugging the membranes and requiring constant cleaning. H2S itself poisons electrolytes and anodes in both galvanic and polarographic DO systems, causing frequent failure that makes them unreliable measurement/control tool. Based on luminescence technology, this new system does not use any electrolyte or traditional electrodes that are easily fouled by
H2S and so are a good choice for systems where H2S is being controlled using DO as a guide.

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