Performance Verification Statement for the Hach Hydrolab DS5X and HL4 Dissolved Oxygen Sensors

Ref. No. [UMCES] CBL 2016-014

ACT VS16-05

Figure 8

. Top panel:

Time series of DO measured by HACH DS5X deployed during the 18 week HIMB field

trial. Continuous DO recordings from instrument (blue line) and DO of adjacent grab samples determined by

Winkler Titrations (red circles.)

Bottom Panel: T

ime series of the difference between the DS5X and

reference measurements for each matched pair in the range of ± 2mg/L DO (n=53 of a total possible 129

observations).