Course 4: Operating Kuntze Systems
- Lesson 1 – Calibrating Your Zirkon® pH Sensor (4:05)
- Lesson 2 – Calibrating Your Zirkon® DIS Sensor (2:44)
- Lesson 3 – Taking and Entering Reference Measurements (4:35)
- Lesson 4 – Keeping Your Zirkon® DIS Sensor Clean (1:37)
- Lesson 5 – Interpreting Differences Between DPD and Your Kuntze Analyzer (1:38)
- Lesson 6 – No Flow Events (2:48)
- Lesson 7 – Troubleshooting Common Issues (3:52)
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Lesson 5 – Interpreting Differences Between DPD and Your Kuntze Analyzer (1:38)
Watch the video to learn how to interpret DPD results and when a new calibration of your Zirkon DIS® sensor is necessary.
Interpreting Tolerances
Many drinking water applications follow tolerances outlined in USEPA 334.0, which states that “[analyzer] reading must be within ± 0.1 mg/L or ± 15% (whichever is larger) of the grab sample measurement.”
To visualize this, we show reference measurements with a green circle with error bars on our graphs. Here is an example calculation using the ± 15% tolerance:
DPD value = 2.00 ppm
Tolerance = 0.15 x 2.00 ppm = 0.30 ppm
Accepted range is 1.70 to 2.30 ppm.
- 2.30 ppm
- 2.00 ppm
- 1.70 ppm
To be compliant with USEPA 334.0, the analyzer measurement would have to be between 1.70 ppm and 2.30 ppm for a DPD measurement of 2.00 ppm using a ± 15% tolerance.