Krypton® Multi / Krypton® DIS (Total) DIS Calibration — Quick Guide – Kuntze Instruments GmbH

Short guide for correct DIS (free chlorine / disinfectant) calibration in daily operation on legacy Krypton® Multi and Krypton® DIS systems, including Krypton® DIS (Total) where the same on-site reference workflow applies.

Overview

For a trustworthy DIS reading, calibrate on site against a reference. The usual reference is a photometric DPD measurement on the same water sample that reaches the sensor during stable operation.

Calibration type: on-site reference calibration
Reference method: DPD colorimetric measurement
Use photometric DPD procedures only (not visual-only estimation)

Topic	Krypton® Multi	Krypton® DIS / DIS (Total)
Typical sampling point	Sample from the sampling reference valve on the Argon StabiFlow® assembly while sample flow to the sensor is stable (often labelled on mounting diagrams).	Sample from the assembly sampling / reference valve; ensure flow matches normal operation.
Flow before calibration	Resolve any “Digital input 1 (no water)” / flow alarms first; keep flow within specification (~30 L/h regulated sample path).	Same hydraulic principle: stable regulated flow through the StabiFlow®; fix low-flow messages before calibrating.
Calibration menu	Main menu > Cal > Cal DIS (wording may show Menu on some firmware builds).

Before you calibrate

Water chemistry (temperature, conductivity, pH) should match normal operation.
Clean or maintain the DIS sensor first if response is sluggish or fouled (see cleaning articles below).
After ASR® cleaning cycles, wait until measurement has stabilized before calibrating (typically 15–30 minutes after cleaning ends).
Use fresh DPD reagents and follow the photometer manufacturer instructions.

Calibration menu path

Main menu > Cal > Cal DIS

Procedure (Multi and DIS)

Take a representative sample from the sampling reference valve while the analyzer is in normal flow.
Run the DPD photometric reference test on that sample and note the result in the correct unit (for example mg/L or ppm as used on site).
Open Main menu > Cal > Cal DIS.
Enter the DPD reference value when prompted; confirm with OK and save per display prompts.
Verify that the live reading matches expectations after stabilization; repeat only if procedure or sampling was faulty.

Multi only: If several disinfectant channels are installed, select the channel that matches your sensor position (for example DIS 1) before accepting calibration data.

DIS (Total): Use the same menu path; reference chemistry must match your certificate range for total chlorine.