Oxygen Analyser

The Ratio Oxygen Analyser is an innovative accessory that transforms your compatible Ratio iDive or iX3M dive computer into a fully automatic professional oxygen analyser, eliminating the need to carry a separate analysing device. Designed and manufactured in Italy, it provides divers with a fast, accurate and convenient method of verifying the oxygen content of Nitrox and mixed-gas cylinders before every dive.

Unlike conventional handheld analysers, the Ratio Oxygen Analyser works directly with your compatible Ratio dive computer, using the computer's powerful processing capabilities to automatically calibrate the sensor, validate readings and compensate for atmospheric pressure. The result is an accurate oxygen analysis that can be transferred directly into your dive computer, reducing the chance of manual input errors and streamlining your pre-dive preparation.

Ideal for recreational Nitrox divers, technical divers and dive professionals alike, the analyser delivers precise oxygen measurements from 0.1% to 100% O₂, allowing confidence when analysing Air, Nitrox and Trimix cylinders. Once connected, your Ratio dive computer automatically guides you through the analysis process, making cylinder verification quick, intuitive and reliable.

Built from durable Delrin® engineering polymer, the analyser is lightweight, robust and designed to withstand the demands of regular dive travel and everyday use. The electrochemical oxygen sensor is user-replaceable, while the easily accessible battery can also be replaced without specialist tools, ensuring years of dependable service.
Whether you're preparing a single Nitrox cylinder for a recreational dive or analysing multiple decompression gases before a technical expedition, the Ratio Oxygen Analyser provides a convenient, integrated solution that simplifies gas verification while helping ensure every dive begins with accurate cylinder information.

Key Features

• Converts compatible Ratio iDive and iX3M dive computers into professional oxygen analysers
• Automatic sensor calibration for accurate oxygen measurements
• Automatic sensor validation before each analysis
• Direct integration with your dive computer for seamless gas mix setup
• Measures oxygen concentrations from 0.1% to 100% O₂
• High accuracy of ±1%
• Fine 0.1% measurement resolution
• Fast sensor response with readings in approximately 10 seconds
• Durable Delrin® body for long-lasting reliability
• User-replaceable electrochemical oxygen sensor
• User-replaceable battery for easy maintenance
• Ideal for analysing Air, Nitrox and Trimix cylinders
• Compact, lightweight and easy to travel with

Sensor: Electrochemical (compatible with Vandagraph R-22VAN or Analytical Industries PSR-11-39-MD);
Range: 0.1-100%,
Resolution: 0.1%
Accuracy: +/- 1%
Temperature of use: 0 -> +40°C
Temperature of stock: 0 -> +50°C
Sensor life-time: about 36 months (at 25°C, 50% R.H., sea level, with protection cap plugged)

User-replaceable sensor
Sensor update time: c.a. 10sec

User-replaceable battery
Battery type: 1.5V type N, LR1, MN9100,AM5, 4001 (standard)

Automatic calibration of the sensor: Yes
Automatic validation of the sensor: Yes

What's in the box:

• Oxygen analyser
• 1 sensor Vandagraph R-22VAN
• 1 battery 1.5V type N, LR1, MN9100,AM5, 4001 (standard)
• 1 protective cap for sensor