Out of measuring range - DIS – Kuntze Instruments GmbH

This article explains what to do when the analyzer shows an out of measuring range message for DIS.

What This Message Means

The measured value exceeds the selected DIS measuring range, but the input can still handle the signal for a short time. If the condition continues, the analyzer will prompt you to check the DIS input.

Typical Causes

Most common: unexpected process event caused overdosing. Consider interlocking a Kuntze flow switch and/or an external controller stop into the chemical control logic.
Common: sensor not calibrated under stable conditions. Manually clean the sensor and perform a new calibration.
Least common: sensor end-of-life / failed 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.

Recommended Actions

Switch to a higher DIS measuring range: Main menu > IN/OUT > ANALOG > DIS
Review preventive controls to reduce overdosing risk (flow interlocks, controller stops, alarm limits).
Verify calibration values (slope / zero point) are plausible after the event.