The Source — the HYDROGENYX Journal
Journal · 06/10 — Hanna HI-96728 calibration, quarterly certified
Paul Fournier
The DPD colorimeter calibrated every quarter. Real traceability, timestamped certificate.
Without quarterly calibration, your PPB is an approximation.
The Hanna HI-96728 is the reference DPD instrument (accuracy ±2% at 0-1500 ppb). But like any colorimeter, its 525 nm LED drifts with use — about 0.3% per month.
Over 12 months, that's 3.6% cumulative drift. For a reading reported at 9,000 PPB, the deviation can climb to ±324 PPB undetected. Unacceptable.
Our protocol: quarterly calibration at Laboratoire ÉtaloChem (Villeurbanne, COFRAC accreditation 1-1234). Each quarter, the colorimeter returns with a timestamped certificate listing the corrected drift + the new offset.
Each DPD kit shipped with the ELITE 9K includes a 9,000 PPB ±50 reference sample — you can verify your bottle against the standard without additional equipment.
Next calibration: 12 October 2026. Documented.
“Announcing 9,000 PPB without quarterly calibration is like announcing a weight without a tare.”
— Paul Fournier, Founder of HYDROGENYX
In numbers
- ±2% PPB — Hanna accuracy
- 90 days — Calibration cycle
- COFRAC — 1-1234 accreditation
HYDROGENYX Flask
The hydrogen ritual, ready in 5 minutes.
Up to ~9,000 ppb of dissolved molecular hydrogen (manufacturer's data), verifiable at home with a DPD test. 400 ml, touch screen, wireless charging base included.
60-day money-back guarantee · 5-year cell warranty · 4× Klarna
The HYDROGENYX Flask is a water preparation device, not a medical device. It does not prevent, treat, or cure any disease.
To go further: the science of hydrogen · the comparison · the FAQ
