Check measuring input - DIS

This article explains what to do when the analyzer shows Check measuring input - DIS.

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What This Message Usually Means

The DIS input signal is outside the valid operating window for the selected range/configuration. The fastest fix is usually process concentration or range selection, then cabling, then hardware.

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Typical Causes

• Most common: disinfectant concentration is too high for the selected measuring range. Reduce concentration or select a higher range (maximum range example: 0-20 ppm, depending on configuration).
• Common: cable and/or sensor connection issue. Re-seat connectors and verify wiring against the correct terminal diagram for your analyzer model.
• Least common: hardware malfunction (analyzer input / electronics).

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Recommended Actions

• Confirm real disinfectant concentration with a valid reference method
• If concentration is high, lower dosing or expand DIS measuring range in the menu
• Inspect DIS cable routing, connector tightness, and correct terminal assignment
• If wiring is correct and concentration is normal, contact Kuntze support with trend and event timing

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Root Cause Flowchart

Use the internal troubleshooting flowchart for DIS input checks:

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Related Articles

• Out of Measuring Range - DIS
• DIS Measurement Always Shows 0 ppm