Overview
This article explains why calibration is required for amperometric DIS sensors and what calibration changes in the measurement. It applies to both NEON® ONE and Legace (Neon®/ Krypton® ) systems.
Why Calibration Is Necessary
A DIS sensor generates an electrical raw signal. Calibration links this raw signal to a real concentration value (mg/L).
Without calibration, the analyzer can detect changes, but absolute values may be inaccurate.
What Calibration Does
- Defines the relationship between sensor signal and actual disinfectant concentration.
- Aligns analyzer output with a reference method (typically DPD).
- Compensates for real installation and process conditions.
What Calibration Does Not Do
- It does not replace sensor cleaning.
- It does not correct sampling or reference-test errors.
- It does not fix unstable flow or pressure conditions.
When to Calibrate
- At startup of a new sensor.
- After sensor replacement.
- After manual cleaning (if measurement behavior changed).
- When drift is confirmed against a reliable reference.
Best Practice
- Take the sample close to the measuring point.
- Use a reliable reference method and valid reagents.
- Use stable flow conditions during calibration.
- Confirm plausibility after calibration before releasing control actions.
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