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

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Ref. No. [UMCES] CBL 2016-014
ACT VS16-05
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Figure B. Response of the Hach HL4 LDO (sn 0431) to changing dissolved oxygen
concentrations at 15.4 oC and S=8.82. Top Panel: Time series of instrument readings and Winkler
reference samples drawn at level of sensor foil in well-mixed test tanks. Bottom Panel:
Corresponding offset between instrument reading and Winkler DO reference sample during
exposure trial. Dotted line represents zero offset from reference. Note that sampling rate was set
at 900 s instead of 60 s due to a programing error, which resulted in lost matched reference
comparisons.