The Orion polarographic DO probe is used for DO analysis in the aeration basin and in wastewater effluent. The concentration of DO in water is affected by ambient temperature, atmospheric pressure, and salinity of sample.

The Orion Star Plus meter has the capability to correct DO measurement for all. If the salinity of the sample is 1 ppt (~0.5 mS/cm conductivity) or more, use the salinity correction.  See Electrode Log 54 Correcting DO Measurement for Salinity for details.