If the DIS reading stays at 0 ppm, start with the most common installation and process causes, then verify calibration state and sensor health.
Typical Results
- Most common for Krypton® DIS (Total) / Krypton® Multi : sensor cable not connected correctly (wrong terminal / loose connection). Verify wiring against the correct connection diagram for your analyzer model.
- Common: no disinfectant present in the sample (expected 0 ppm).
- Common: incorrect or unintended zero-point calibration (can shift the measurement baseline and make the reading appear stuck at/near 0 ppm).
- Least common: sensor fault or end-of-life sensor (replace sensor).
Note: sensor lifetime is water-quality and application dependent. As a practical rule, many process sensors are replaced on a planned cycle (for example annually), depending on fouling and chemical stress.
Signal Check (mV)
DIS raw signals should be positive under normal conditions.
Negative mV values can indicate stray currents or chemical interference.
Take a water sample in a beaker and move the sensor gently to create flow. If the signal remains negative, treat this as a chemical interference case (more common with chlorine dioxide applications).
Root Cause Flowchart
Use the internal troubleshooting flowchart for DIS zero readings for Krypton® DIS (Total) / Krypton® Multi:
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