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Nitrox / Scuba Oxygen Analyzer

Oxygen Purity Verification for Enriched Air (Nitrox) Diving — OMD-21

  • Enriched Air Nitrox (EAN)
  • Dive Shop Blending
  • Pre-Dive Verification
  • Recreational & Technical Diving

Nitrox diving uses breathing gas blended with a higher oxygen concentration than ambient air, commonly 32% or 36% O₂, to reduce nitrogen exposure and extend no-decompression limits. Verifying the oxygen concentration of a Nitrox cylinder before use is an important part of safe enriched-air diving, as the actual O₂ concentration directly affects maximum operating depth (MOD) and oxygen exposure.

The OMD-21 handheld oxygen analyzer provides dive shops, fill stations and individual divers with a fast, accurate and easy-to-use method for verifying oxygen concentration at the tank valve before a dive.

Why Verification Matters

Analyzing the oxygen concentration of a Nitrox cylinder before use is a standard safety practice in enriched-air diving. The diver should verify the actual O₂ concentration of the breathing gas rather than relying solely on the stated blend or fill information. An inaccurate oxygen concentration can change the calculated maximum operating depth (MOD) and oxygen exposure, making accurate pre-dive verification an important part of safe Nitrox diving.

Where It's Used

  • Dive shop fill stations — verifying blended Nitrox before cylinders leave the shop
  • Dive boats and charter operations — spot-checking tanks dockside or on deck
  • Individual divers — personal pre-dive analysis at the tank valve
  • Technical diving — verifying multiple gas mixes (travel, bottom, deco gases)

Recommended Analyzer

OMD-21 Analizzatore portatile manuale di ossigeno percentuale, CE

Progettato per misurare la percentuale di ossigeno in un design portatile e robusto. Questo analizzatore compatto con il suo sensore remoto e allarmi acustici integrati è progettato pensando al cliente, offrendo un modo a bassa manutenzione, semplice ed economico per verificare con precisione i livelli di ossigeno percentuale.

For diving applications, the OMD-21 provides a simple and portable method for verifying oxygen concentration in Nitrox and other breathing gas mixtures. The remote oxygen sensor with flow diverter allows convenient measurement directly at the cylinder valve, making it ideal for dive shops, fill stations, charter operations and individual divers.

  • Alimentazione a batteria AAA
  • Allarmi configurabili
  • 0 – 100% Intervallo di Misurazione
  • Sensore remoto con deviatore di flusso

Key Specifications for Nitrox Use

  • Range: 0 – 100% O₂ — covers standard and technical Nitrox blends in one unit
  • Resolution: 0.01% O₂ — provides easy-to-read verification of Nitrox oxygen concentration
  • Power: 3-AAA batteries — no charging station needed at the fill station or on the boat
  • Alarms: Integral, adjustable high/low audible alarms for out-of-spec blends
  • Enclosure: Rugged ABS, portable — built for repeated daily use in dive shop and dockside conditions

Domande frequenti

Standard recreational Nitrox blends such as EAN32 and EAN36 fall well within a 0–100% O₂ measurement range. The OMD-21 covers the full 0–100% range in a single analyzer, making it suitable for both recreational Nitrox and higher-oxygen technical diving mixtures.

Electrochemical oxygen sensors are consumable and gradually deplete over time. Expected sensor life depends on operating conditions, oxygen exposure and frequency of use. Contact Southland Sensing for additional information on expected sensor life and recommended replacement intervals.

Yes. The OMD-21 is battery powered, portable and designed for low-maintenance operation, making it well suited for routine oxygen verification at dive shop fill stations, on dive boats and for individual pre-dive Nitrox analysis.

Need help specifying an analyzer for your dive operation?

Our application engineers can help confirm the right model for your fill volume and blend range.

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