What is T90 (Reaction Time)?
T90 is the time a sensor needs to reach 90% of a concentration change.
Example: If free chlorine changes from 0.00 to 1.00 mg/L, T90 is the time until the sensor reaches 0.90 mg/L. A lower T90 means the measurement follows real process changes faster.
Verified Third-Party Results
Independent third-party testing shows fast response times for both current and legacy Kuntze platforms:
- KRYPTON® ONE + ZIRKON® ONE DIS: T90 = 24 s (free chlorine, positive and negative step changes)
- KRYPTON® K + ZIRKON® DIS (legacy series): T90 = 21 s (free chlorine)
Conclusion: the legacy series already delivered very strong response performance, and the current platform continues at a comparable high level.
What This Means in Operation
- Fast control feedback: Dosing changes are reflected quickly in the measured value.
- Reliable trend interpretation: Real process events can be distinguished from slow drift more easily.
- Stable daily operation: Operators can verify process adjustments without long waiting times.
- Strong cross-platform continuity: Both legacy and current systems provide rapid amperometric response.
Scope
This article summarizes third-party-verified T90 performance for Kuntze free chlorine measurement systems. Small differences in seconds can result from test setup and boundary conditions, but both platforms show fast response behavior in practical operation.
References
- Third-party lab report (2008): Krypton K free chlorine response test
- Third-party lab report (18 Dec 2025): Neon/Krypton ONE free chlorine response test
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