Oxygen Analyzer Calibration for Scuba

What is a Scuba Nitrox Analyzer?

Scuba diving with nitrox gas mixtures has gained popularity among divers, as it allows for extended bottom times and reduced nitrogen intake compared to regular compressed air. However, ensuring the accuracy and safety of the nitrox gas mixture is crucial. This is where a scuba nitrox analyzer comes into play.

Nitrox, also known as Enriched Air Nitrox (EANx), is a breathing gas that has a higher percentage of oxygen than the normal air we breathe. This higher oxygen percentage allows divers to extend their bottom time and reduce the risk of decompression sickness.

A Scuba Nitrox Analyzer analyzer is a specially designed device used to measure the percentage of oxygen (O2) present in a scuba diving gas mixture. It provides divers with important information about the gas composition, ensuring that it falls within safe limits.

Selecting the best scuba nitrox analyzer requires considering factors such as accuracy, ease of use, reliability, and overall suitability for individual diving needs. exploring the top Scuba Nitrox Analyzer analyzers available in the market can help make an informed decision.


  • A Scuba Nitrox Analyzer is a device used to measure the concentration of oxygen in a gas mixture used for scuba diving, known as Nitrox.
  • Accurate and precise readings are essential for the safety of divers, as incorrect oxygen levels can lead to potential risks and complications during underwater dives.
  • When choosing a Scuba Nitrox Analyzer, factors such as accuracy, portability, durability, and user-friendly interface should be considered to ensure efficient and reliable performance.

What is a Nitrox Analyzer?

Nitrox analyzers are essential tools for scuba divers who use nitrox gas mixtures. These analyzers measure the percentage of oxygen in the gas mixture to ensure that the diver is breathing the correct gas mixture for the depth they are diving.

Nitrox analyzers come in different types, including handheld analyzers and analyzers that can be mounted on the cylinder. Most nitrox analyzers use a replaceable sensor that allows for an accuracy of within 0.1%. The sensor life of these analyzers varies, but typically they need to be replaced after a certain number of uses or a specific period.

The accuracy and resolution of Scuba Nitrox Analyzers are important factors to consider when choosing an analyzer. The accuracy of an analyzer refers to how close the measured value is to the true value, while the resolution refers to how small a change in the measured value can be detected. Nitrox analyzers with higher accuracy and resolution are more reliable and provide better performance.

When choosing a nitrox analyzer, it is important to consider the simplicity of the device. Most modern nitrox analyzers are designed to be easy to use, with an intuitive user interface and simple buttons. This ensures that even novice divers can use the analyzer without difficulty.

The quality and performance of nitrox analyzers can vary greatly depending on the manufacturer and model. It is important to choose a reputable brand and model that has been tested and proven to provide accurate and reliable readings.

In summary, nitrox analyzers are essential tools for scuba divers who use nitrox gas mixtures. When choosing an analyzer, it is important to consider factors such as accuracy, resolution, sensor life, replacement sensors, performance, quality, and simplicity.

The Importance of a Scuba Nitrox Analyzer

The importance of a scuba nitrox analyzer cannot be overstated. It is essential for divers using nitrox gas blends as it ensures the accuracy of the mixture’s oxygen content. This tool allows divers to safely plan their dives, preventing risks such as oxygen toxicity or harmful decompression sickness.

NITROX Analyzers allow divers to safely plan their dives, preventing risks such as oxygen toxicity or harmful decompression sickness.

Key Features of a Scuba Nitrox Analyzer

  • Calibration: Nitrox analyzers need to be calibrated regularly to ensure accurate readings. Some models come with a temperature compensation chart, allowing the analyzer to be calibrated correctly depending on temperature and humidity.
  • Response time: A fast response time is important for divers who want to check the oxygen concentration quickly. Some nitrox analyzers have a response time of just a few seconds.
  • Detection range: The detection range of the analyzer determines the minimum and maximum oxygen concentrations it can measure. Most nitrox analyzers have a detection range of 0-100% oxygen.
  • Temperature compensation: Nitrox analyzers need to be calibrated at the same temperature as the gas being analyzed. Some analyzers come with a temperature compensation feature that adjusts the readings based on the temperature of the gas.
  • Operating temperature and humidity: Nitrox analyzers need to be used within a specific temperature and humidity range for accurate readings. Some models have an operating temperature range of -10°C to 50°C and an operating humidity range of 0-95%.
  • Battery life and replacement: Nitrox analyzers are often powered by batteries. It’s important to choose a model with a long battery life and a user-replaceable battery.
  • Impact resistant and pocket size: Nitrox analyzers should be portable and rugged enough to withstand the rigors of diving. Some models are impact-resistant and pocket-sized for easy transport.
  • Warranty: A warranty is important for any piece of equipment, including nitrox analyzers. Look for models with a warranty that covers any defects or malfunctions.

The Best Scuba Nitrox Analyzer

Analox O2EII Pro Nitrox Analyzer

The Analox O2EII Pro Scuba Nitrox Analyzer is a popular choice among scuba divers. It is a portable and easy-to-use analyzer that uses an electrochemical oxygen sensor. The sensor is thermally compensated, which means it provides accurate readings even in extreme temperatures. The O2EII Pro Scuba Nitrox Analyzer is also easy to calibrate and has a long battery life.

nitrox analyzer oxygen analyzer Scuba Nitrox Analyzer

Nuvair O2 Quickstick Scuba Nitrox Analyzer

The Nuvair O2 Quickstick Oxygen Analyzer is another popular Nitrox analyzer. It is a compact and lightweight analyzer that uses a galvanic oxygen sensor. The sensor provides accurate readings quickly, and the analyzer is easy to use. The Nuvair O2 Quickstick Oxygen Analyzer is also affordable and has a long battery life.

nitrox analyzer

Scuba Nitrox Analyzer O2BOX for Scuba by Forensics Detectors

The Oxygen Analyzer O2BOX for Scuba by Forensics Detectors is a high-end Nitrox analyzer. It uses a precision electrochemical oxygen sensor that provides accurate readings quickly. The O2BOX is also easy to use and has a large LCD screen that displays all the necessary information. The analyzer is also rugged and durable, making it a great choice for professional divers.

Nuvair Pro O2 Oxygen Analyzer

The Nuvair Pro O2 Oxygen Analyzer is a high-quality Nitrox analyzer that uses a galvanic oxygen sensor. The sensor provides accurate readings quickly, and the analyzer is easy to use. The Nuvair Pro O2 Oxygen Analyzer is also compact and lightweight, making it a great choice for traveling divers.

Scuba Nitrox Analyzer

Honeywell – Scuba Nitrox Analyzer (sensors)

Honeywell is a well-known brand in the gas detection industry. Although they don’t offer NITROX Analyzers, they offer oxygen sensors that are used by most Oxygen Nitrox Scuba Analyzers.

Scuba Oxygen Sensor
Scuba Oxygen Sensor

Technical Diving and Scuba Nitrox Analyzer

Technical diving involves diving beyond the recreational limits of 40 meters/130 feet and using specialized equipment and gas mixes to manage the increased risk. Nitrox, also known as Enriched Air Nitrox (EANx), is a popular gas mix used by technical divers to reduce nitrogen absorption and extend bottom time. However, using the wrong gas mix can be dangerous, which is why gas analysis is essential for technical diving.

Nitrox analyzers are devices that measure the oxygen content in a gas mix. They are commonly used by technical divers to ensure they are breathing the correct gas mix for their planned dive. The analyzer pulls air from the tank, which reacts chemically with an agent, the oxygen sensor inside. The reaction will result in an electrical current that the oxygen sensor will read.

Technical divers also use helium in their gas mix to reduce the effects of nitrogen narcosis and decompression sickness. Helium is a lighter gas than nitrogen and requires careful analysis to ensure the correct blend. Nitrox analyzers can also measure helium content in a gas mix, making them a valuable tool for technical divers.

Gas analysis is not limited to pre-dive checks; in-line gas analyzers can be installed on a compressor to monitor gas mixtures as they are being filled. This is particularly useful for dive shops and technical divers who fill their own tanks. In-line gas analyzers can detect contaminants and ensure the gas mix is correct before it is used for diving.

Scuba Air Quality Safety
Scuba Air Quality Safety

Affordability of Nitrox Analyzers

One of the most affordable options for a nitrox analyzer is the Forensics Detectors O2BOX Oxygen Analyzer, which can be purchased for around $200. This compact and easy-to-use analyzer is designed for divers who need to quickly and accurately measure the oxygen content of their EAN mix.

Another affordable option is the Analox O2EII Pro Nitrox Analyzer, which can be purchased for around $300. This analyzer is an updated version of the popular O2EII and is designed to be portable and easy to use. It is small enough to fit in a dive bag and can be used to check the quality of your EAN mix directly at the tank or through your BCD adaptor while in your harness.

For those who are willing to spend a little more, there are also mid-range options available. The Palm D Oxygen Analyzer, for example, can be purchased for around $265. This analyzer is designed for divers who want a high-quality and reliable tool that is still affordable. It is easy to use and can measure the oxygen content of your EAN mix with a high degree of accuracy.

Using and Maintaining a Scuba Nitrox Analyzer

Using and maintaining a scuba nitrox analyzer is crucial for divers. In this section, we’ll dive into the proper usage guidelines and share essential tips for maintaining the performance of your nitrox analyzer. Get ready to uncover the key insights that will help you optimize your diving experience and keep your equipment in top condition.

Proper Usage Guidelines

  • Read the instruction manual thoroughly before using the scuba nitrox analyzer to ensure proper usage guidelines.
  • Ensure that the analyzer is properly calibrated before each use, following the proper usage guidelines.
  • Take safety precautions by wearing appropriate protective gear, such as gloves and goggles, when handling the analyzer according to the proper usage guidelines.
  • Perform the analysis in a well-ventilated area to avoid inhaling any toxic gases, as recommended in the proper usage guidelines.
  • Handle the analyzer with care to avoid damaging any delicate components, as stated in the proper usage guidelines.

Oxygen sensors must be replaced in SCUBA NITROX analyzers every 2-3 years.

oxygen scuba analyzer
oxygen scuba analyzer

Tips for Maintaining Nitrox Analyzer Performance

  • Clean the analyzer regularly to remove any dirt or debris that could affect its accuracy.
  • Calibrate the analyzer according to the manufacturer’s instructions to ensure precise readings.
  • Store the analyzer in a dry and cool place to prevent damage or deterioration.
  • Replace the sensors or parts as recommended by the manufacturer to maintain optimal performance.
  • Keep the analyzer away from water or other liquids that could cause damage.

Some Facts About What is a Scuba Nitrox Analyzer?

  • ✅ Nitrox is a gas mixture used in scuba diving with an increased oxygen concentration beyond the normal 20.9% found in compressed air.
  • ✅ Scuba nitrox analyzers are essential tools used by divers to measure the oxygen levels in their nitrox gas cylinders.
  • ✅ Test your tank before every dive and calibrate to fresh air daily.
  • ✅ Scuba nitrox analyzers typically consist of electronics, a digital processor, an analog-to-digital converter, and an electrochemical oxygen sensor.
  • ✅ Special training and certification are required for the safe handling and use of nitrox mixes in scuba diving. (Source: Our Team)

What is the response time of a Nitrox Analyzer?

The response time of a Nitrox Analyzer refers to the time it takes for the device to display an accurate reading of the oxygen concentration in the gas mix. The response time can vary depending on the specific analyzer, but typically it is quick and reliable, providing almost instant results – usually less than 10 seconds.

How accurate should an Oxygen Analyzer for Nitrox be?

An Oxygen Analyzer for Nitrox should be highly accurate to ensure the safety of divers. It is essential that the analyzer provides precise measurements of the oxygen concentration, as even small variations can have significant impacts on diver safety. Therefore, the accuracy should be within a very narrow range of less than 2%. However more technical divers may require higher accuracy to depth planning.

How to tune a Nitrox Analyzer for accurate readings (calibrating)?

To tune a Nitrox Analyzer for accurate readings (also called calibration), it is recommended to calibrate it in natural air with an oxygen concentration of 20.9%. However, calibrating the analyzer at a higher oxygen concentration, such as that found in nitrox-filled cylinders, can increase its accuracy. Following the manufacturer’s instructions for calibration is crucial to ensure accurate readings. Therefore make sure your Nitrox analyzer can be calibrated to fresh air at 20.9% and a high level of oxygen for maximum accuracy.

Why is an oxygen analyzer necessary for nitrox diving?

An oxygen analyzer is necessary for nitrox diving to ensure diver safety. The analyzer allows divers to accurately measure the oxygen concentration in their gas mix, preventing the risk of breathing gas with incorrect or dangerously high oxygen levels. It is a critical safety measure and a requirement by most dive shops for verification purposes.

oxygen scuba analyzer
Oxygen Scuba Analyzer

Safety Precautions

When it comes to diving with nitrox, safety is of utmost importance. Here are some safety precautions to keep in mind when using a nitrox analyzer oxygen scuba:

Gas Cylinder Safety

Always ensure that the gas cylinder is in good condition before use. Check for any leaks, cracks, or damage to the cylinder. If you notice any issues, do not use the cylinder and have it inspected by a qualified technician.

Flow Restrictor Safety

A flow restrictor is used to control the flow of gas into the analyzer. It is important to use the correct flow restrictor for the cylinder being analyzed. Using the wrong flow restrictor can result in false readings and inaccurate analysis.

False Readings

Nitrox analyzers are sensitive instruments that require proper handling and calibration. Even small amounts of oil, moisture, or dirt can affect the accuracy of the readings. Always ensure that the analyzer is clean and calibrated before use.

Personal Injury and Death

Diving with nitrox requires proper training and certification. Failure to follow the correct procedures can result in serious injury or death. Always dive within your limits and follow all safety protocols. Also do not forget to test your tank for carbon monoxide also.