Oxygen Scuba Analyzer

What is a Scuba Oxygen Analyzer?

A scuba oxygen analyzer is an essential tool used by divers to measure the oxygen content in scuba tank gas. It is commonly known as a nitrox analyzer or scuba gas analyzer. By accurately analyzing the gas, divers can ensure the safety and efficiency of their dives. The functions of a scuba oxygen analyzer include determining the oxygen levels in the gas mixture and providing real-time data for gas monitoring.

Analyzing scuba gas is crucial for several reasons. It helps divers avoid breathing gas with incorrect oxygen levels, which can lead to serious health risks, such as oxygen toxicity or decompression sickness. Furthermore, analyzing scuba gas ensures that the gas mixture is within the acceptable range for the planned dive, maximizing the diver’s bottom time and overall diving experience.

The functioning of a scuba oxygen analyzer is based on the principles of electrochemical sensors. These sensors measure the oxygen levels by monitoring the electrical current generated when the gas reacts with the sensor. The readings are displayed on a digital or analog interface, providing divers with accurate and real-time oxygen content information.

There are different types of scuba oxygen analyzers available in the market. Nitrox analyzers are specifically designed to measure the oxygen content in nitrox gas mixtures, which contain higher oxygen levels than regular air. Portable oxygen analyzers offer compact and portable options for divers to carry during their dive trips. Handheld oxygen analyzers provide versatility and ease of use for divers as they can be operated with one hand and provide quick readings.

Performing scuba gas analysis involves a step-by-step process, including attaching the analyzer to the tank valve, purging and calibrating the analyzer, and obtaining the oxygen content reading. Following proper procedures and guidelines is crucial to obtain accurate results and ensure the safety of the diving experience.


  • A scuba oxygen analyzer is a device used to measure the oxygen content in scuba diving gas, ensuring divers have a safe breathing mixture.
  • Analyzing scuba gas is important to prevent oxygen toxicity and ensure divers are using the correct gas blend for their planned dive.
  • There are different types of scuba oxygen analyzers available, including nitrox analyzers, portable oxygen analyzers, and handheld oxygen analyzers, each with its own features and benefits. There are also inline oxygen analyzers for dive shop fill stations to continuously monitor gas quality when tanks are being filled.

What is a Scuba Oxygen Analyzer?

A Scuba Oxygen Analyzer is a device used by scuba divers to measure the oxygen content in their breathing gas. It plays a crucial role in ensuring the safety of divers while exploring underwater environments. By taking a small sample of the gas mixture and analyzing it, the Scuba Oxygen Analyzer determines the percentage of oxygen present. This information is vital as it helps divers avoid breathing gases with incorrect oxygen levels, which can lead to serious consequences like oxygen toxicity or hypoxia.

Considering factors like accuracy, reliability, ease of use, and compatibility with different gas mixtures is important when choosing a Scuba Oxygen Analyzer. Some popular brands of Scuba Oxygen Analyzers include Analox, Submersible Systems, Maxtec, Forensics Detectors, and Nuvair.

Key Functions of a Scuba Oxygen Analyzer?

A scuba oxygen analyzer plays a crucial role for scuba divers by serving several important functions. It helps measure the oxygen levels in the scuba tank, ensuring its safety for use. This is vital because incorrect levels of oxygen can pose serious health risks, including oxygen toxicity or hypoxia.

Furthermore, a scuba oxygen analyzer assists divers in determining the mixture of gases present in the tank, such as nitrogen or other gases. This information is crucial for planning the dive and calculating necessary decompression stops.

A scuba oxygen analyzer enables divers to monitor the performance and accuracy of their diving equipment. By regularly analyzing the oxygen levels, it becomes possible to detect any potential malfunctions or leaks in the equipment, thus ensuring the safety of the diver.

oxygen scuba analyzer
Oxygen Scuba Analyzer Testing Air in a SCUBA Tank

Why is it Important to Analyze Scuba Gas?

Scuba diving safety heavily relies on the analysis of scuba gas to verify that the gas mixture adheres to the desired composition for a secure dive. By scrutinizing scuba gas, divers are able to assess the levels of oxygen, nitrogen, and other gases that are present within the tank.

Understanding the significance of analyzing scuba gas becomes apparent when considering the prevention of oxygen toxicity. Maintaining appropriate oxygen levels within the gas is essential to avoid severe health complications such as seizures or loss of consciousness. Conversely, insufficient oxygen levels can result in hypoxia, which also poses substantial risks.

The process of analyzing scuba gas empowers divers to guarantee the usage of the correct gas mixture based on various diving depths. Consistently monitoring nitrogen levels is crucial for mitigating the occurrence of nitrogen narcosis, a condition that can impair judgment and coordination.

Ultimately, the analysis of scuba gas holds immense importance in upholding diver safety. It ensures that the gas composition aligns with the planned dive, subsequently averting potential health risks.

How Does a Scuba Oxygen Analyzer Work?

Here is a step-by-step guide on how a Scuba Oxygen Analyzer works:

  1. Attach the analyzer to the tank valve using a special adapter.
  2. Open the tank valve to allow a small amount of gas to flow into the analyzer.
  3. The gas sample passes through a sensor that measures the oxygen content.
  4. The analyzer displays the oxygen level as a percentage on its screen.
  5. Compare the reading to the recommended oxygen percentage for the specific dive, usually around 21% for recreational diving.
  6. If the reading is within the safe range, the diver is good to go. If not, adjustments or tank changes must be made before diving.

How long do OXYGEN sensor last?

The lifespan of an electrochemical oxygen sensor can vary depending on several factors, such as the quality of the sensor, the frequency of use, and the conditions under which it is used.

Generally, electrochemical oxygen sensors have a lifespan of approximately 1 to 2 years. However, some sensors can last up to 3 years or more with proper care and maintenance.

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

It is important to note that electrochemical oxygen sensors can become less accurate over time, which can affect the readings they provide. Therefore, it is recommended that the sensor be replaced every 1 to 2 years, or as recommended by the manufacturer, to ensure accurate and reliable readings.

Replacement oxygen sensor costs for a SCUBA oxygen analyzer is between $100 to $200 USD.

What is the Best Scuba Oxygen Analyzer

When it comes to choosing the best scuba oxygen analyzer, there are a few important factors to keep in mind. From reliability to accuracy, we’ll dive into what you need to consider. There are several oxygen analyzers that are credible. The most popular include the below with excerp pro/cons comments obtained from Amazon reviews:

Nuvair O2 Quickstick Oxygen Analyzer

Nuvair O2 Quickstick Oxygen Analyzer


  • Easy to Calibrate: The Nuvair O2 Quickstick Oxygen Analyzer is incredibly easy to calibrate, making it perfect for both beginners and experienced divers alike.
  • Fast Response Time: With a response time of just a few seconds, you won’t have to wait long to get an accurate reading of your oxygen levels.
  • Replaceable Battery and Sensor: The battery and sensor on the Nuvair O2 Quickstick Oxygen Analyzer are both replaceable, making it a cost-effective and long-lasting investment.


  • Larger Than Expected: Some users have reported that the Nuvair O2 Quickstick Oxygen Analyzer is larger than they expected, which can make it a bit cumbersome to carry around.
  • No Calibration Gas Included: Unlike some other scuba oxygen analyzers on the market, the Nuvair O2 Quickstick Oxygen Analyzer does not come with calibration gas, which will need to be purchased separately.
  • Limited Features: While the Nuvair O2 Quickstick Oxygen Analyzer is a reliable and accurate tool for measuring oxygen levels, it doesn’t come with many additional features or bells and whistles.

Analytical Industries Palm D Oxygen Analyzer

Palm D Oxygen Analyzer


  • One-button calibration in either Air or 100% Oxygen is exceptionally easy
  • Durable sealed impact-resistant housing
  • User-replaceable Oxygen sensor maintains accuracy


  • No case or attachment included, despite being shown in product information
  • Manual states the device should never be calibrated with air or 21% oxygen
  • The product arrived with no owner’s manual and scratches on the screen



  • The analyzer has a large range of 0% – 100% with 0.1% resolution, making it easy to get accurate readings.
  • The electrochemical oxygen sensor has an error rate of less than 0.2%, ensuring accurate readings every time.
  • The water-resistant case protects the analyzer and user manual from water damage, making it durable and long-lasting.


  • The case design has been criticized by some users, but this does not affect the performance of the analyzer.
  • The batteries included may arrive dead, so you may need to purchase new ones before use. (batteries now arrive NOT in the device, so they are fresh)

Maxtec Handi+ Handheld Oxygen Analyzer

Maxtec Handi+ Handheld Oxygen Analyzer


  • The Handi+ is compact and lightweight, making it easy to carry around and use on-the-go.
  • It features an easy-to-read LCD display and provides accurate oxygen level readings.
  • The analyzer comes with a protective wrap and lanyard attachment, which helps prevent damage and makes it easy to keep on hand.


  • The analyzer doesn’t have a high/low alarm, which could be a downside for some users.
  • The accuracy of the analyzer may be affected by temperature changes, so it’s important to use it within the recommended temperature range.
  • The analyzer may not be as durable as some other models on the market.

Buying Guide

When it comes to buying a scuba oxygen analyzer, there are several factors to consider to ensure you get the best product for your needs. Here are some things to keep in mind:


One of the most important features to consider when purchasing a scuba oxygen analyzer is accuracy. The device should be able to accurately measure the oxygen concentration in the tank, so you can be confident that you are breathing safe air. Look for a device that has a high level of accuracy, ideally with a margin of error of no more than 1%.

Ease of Use

Another important factor to consider is ease of use. The device should be easy to use, with clear instructions and a simple interface. You should be able to quickly and easily take readings, without having to spend a lot of time fiddling with the device.


Scuba diving can be tough on equipment, so you want a device that is built to last. Look for a device that is made from high-quality materials and is designed to withstand the rigors of diving. Ideally, the device should be waterproof and shockproof, so it can handle any bumps or drops.

Battery Life

Finally, consider the battery life of the device. You want a device that will last for several dives, so you don’t have to worry about running out of battery in the middle of a dive. Look for a device with a long battery life, ideally one that can last for at least 10 hours of continuous use.

What are the benefits of using an oxygen analyzer for scuba diving?

Using an oxygen analyzer for scuba diving has several benefits. It allows us to accurately measure the oxygen content in our scuba tank, which is essential for safe diving. By knowing the exact oxygen content, we can adjust our dive plan accordingly, reducing the risk of decompression sickness and other diving-related injuries. Additionally, we can conserve our air supply by using less oxygen during our dive, which can extend our bottom time.

What are the differences between a handheld and a stationary oxygen analyzer?

A handheld oxygen analyzer is portable and can be easily carried around. It is ideal for divers who need to check their tank’s oxygen content before a dive. A stationary oxygen analyzer, on the other hand, is fixed in place and is usually used in dive shops or on dive boats. It is designed to measure the oxygen content of multiple tanks quickly and accurately.

How often should I calibrate my scuba oxygen analyzer?

It is recommended that you calibrate your scuba oxygen analyzer before each use to ensure that it is accurate. Additionally, you should calibrate it more frequently if you notice any changes in its readings or if it has been dropped or damaged.

What are some common issues that can affect the accuracy of scuba oxygen analyzers?

Some common issues that can affect the accuracy of scuba oxygen analyzers include sensor contamination, sensor degradation, and exposure to extreme temperatures and extreme humidity or acid-corrosive chemical gases and vapors. It is important to properly maintain and care for your oxygen analyzer to ensure that it continues to provide accurate readings.

Nitrox SCUBA Analyzer

A nitrox analyzer is a device used to measure the concentration of oxygen and nitrogen in a gas mixture. Nitrox is a gas mixture that contains higher levels of oxygen and lower levels of nitrogen than regular air.

An oxygen analyzer, on the other hand, is a device that measures the concentration of oxygen in a gas mixture. While a nitrox analyzer can also measure the oxygen concentration, its primary function is to determine the percentage of nitrogen in the mixture, which is important for scuba divers who use nitrox as a breathing gas.

Factors When Selecting a Scuba Oxygen Analyzer

  1. When selecting a scuba oxygen analyzer, there are several important factors to consider:
  2. Accuracy: Look for an analyzer that provides precise and reliable oxygen measurements to ensure the safety of your diving experience.
  3. Compatibility: Make sure the analyzer is compatible with the type of gas mixtures you use while diving, such as nitrox or trimix.
  4. Portability: Consider the size and weight of the analyzer, especially if you plan to carry it with you during dives. A portable or handheld analyzer may be more convenient.
  5. Battery life: Check the battery life of the analyzer to ensure it can last for the duration of your diving trips without needing frequent recharging or replacement.
  6. User-friendly interface: Choose an analyzer with an easy-to-use interface and clear display, allowing for quick and accurate readings even in underwater conditions.
  7. Durability: Opt for a rugged and waterproof analyzer that can withstand the demands of scuba diving and is resistant to corrosion and impact.
  8. Price: Consider your budget and compare the features and performance of different analyzers to find the best value for your money.

Why is Scuba Gas Analysis Important for Divers’ Safety?

Scuba gas analysis is crucial for divers’ safety. By analyzing the gas mixture in scuba tanks, divers can ensure that the oxygen and other gases are at the correct levels. This is important because incorrect gas mixtures can lead to serious health risks, such as oxygen toxicity or nitrogen narcosis.

During a dive, divers are exposed to high pressure and changes in depth, which can affect how their bodies absorb and process gases. The correct gas mixture is essential for maintaining proper breathing and preventing physiological problems. Scuba gas analysis helps divers determine if the gas in their tanks meets safety standards and if any adjustments need to be made.

Regular and thorough gas analysis is recommended before every dive to avoid potential accidents or malfunctions. Divers should also be aware of the potential presence of contaminants, such as carbon monoxide, which can have severe health effects.

Test your gas tank before every dive to avoid potential accidents or malfunctions.

To ensure divers’ safety, it is essential to invest in a reliable scuba oxygen analyzer and obtain training on how to perform accurate gas analysis. By prioritizing gas analysis, divers can enjoy their underwater adventures with peace of mind.

Remember to regularly maintain and calibrate your scuba oxygen analyzer for accurate readings, and always follow safety protocols to minimize risks while diving. Stay safe and explore the underwater world responsibly!

How Often Should Scuba Gas be Checked?

Scuba gas should be checked regularly to ensure divers’ safety underwater. The frequency of gas checks depends on various factors such as the type of gas used, diving conditions, and dive agency recommendations. As a general guideline, scuba gas should be checked before each dive to verify its quality and composition. This is crucial as it helps to detect any potential contaminants such as carbon monoxide or low oxygen levels, which can pose serious risks to divers.

Gas checks should be performed periodically even if the gas cylinders have not been used for a while. This is because gas quality can degrade over time, especially if cylinders are not properly stored or maintained. It’s important to note that scuba gas checks should be conducted by qualified professionals using reliable scuba oxygen analyzers to ensure accurate readings.

What is NITROX and Enriched Air?

Diving is primarily conducted using compressed air, which is fresh air containing 20.9% oxygen. However, Nitrox, or enriched air nitrox (EAN), is a popular alternative that contains a higher concentration of oxygen than 20.9%.

Enriched air is recognized by the World Recreational Scuba Training Council (WRSTC) training agencies as any gas mixture with an oxygen partial pressure above 20.9%. Recreational Nitrox mixes typically range from 21% to 40%, with the most common proportions being between 32% and 36%.

Nitrox cylinders are typically marked with a green color and a thick, yellow line, or a green and yellow sticker with the words NITROX or ENRICHED AIR.

Using Nitrox safely requires special training and certification, both in recreational and technical diving. Dive shops require divers to have a valid nitrox or advanced nitrox certification before filling their tanks.

oxygen analyzer

What is the Ideal Oxygen Level for Scuba Diving?

The ideal oxygen level for scuba diving is between 20% and 22%. To ensure a safe diving experience, it is crucial for divers to be aware of and monitor the oxygen level closely during their dives. This range provides an adequate amount of oxygen for divers to breathe comfortably and safely underwater. Divers can use a scuba oxygen analyzer to monitor the percentage of oxygen in the breathing gas and ensure it falls within the safe range. By regularly checking the oxygen level, divers can make necessary adjustments to maintain a safe breathing environment and prevent the risks of hypoxia or hyperoxia. Oxygen levels that are too low can cause dizziness, confusion, and loss of consciousness, while levels that are too high can lead to oxygen toxicity, resulting in seizures or loss of motor control. Therefore, divers should always use a reliable scuba oxygen analyzer and follow proper safety procedures to enhance their overall diving experience.

Can Scuba Oxygen Analyzers Detect Carbon Monoxide?

Scuba oxygen analyzers DO NOT and CANNOT detect carbon monoxide (CO) in scuba gas. You must purchase a separate CO Analyzer for that purpose.

The carbon monoxide can be present in compressed air or nitrox cylinders. Contaminated air sources or poorly maintained equipment can introduce this odorless, colorless, and tasteless gas into the gas supply, making it challenging for divers to detect without specialized equipment.

Scuba oxygen analyzers DO NOT and CANNOT detect carbon monoxide (CO) in scuba gas. You must purchase a separate CO Analyzer for that purpose.

How to Calibrate a Scuba Oxygen Analyzer?

To ensure accurate readings and maintain the safety of divers, calibrating a scuba oxygen analyzer is crucial. Here is a step-by-step guide on how to calibrate a scuba oxygen analyzer:

  1. Check the manufacturer’s instructions on how to calibrate a scuba oxygen analyzer: Familiarize yourself with the specific calibration process outlined by the manufacturer of your analyzer.
  2. Gather the necessary equipment for calibrating a scuba oxygen analyzer: Ensure you have the calibration gases recommended by the manufacturer, as well as any calibration adapters or fittings required.
  3. Prepare the calibration gas following the instructions: Properly connect the calibration gas cylinder to the analyzer.
  4. Turn on the analyzer: Power on the scuba oxygen analyzer and allow it to warm up for the recommended timeframe.
  5. Initiate calibration mode: Access the calibration mode on the analyzer and follow the prompts or instructions provided by the manufacturer to calibrate a scuba oxygen analyzer.
  6. Adjust the readings: Use the calibration gas to adjust the analyzer’s readings to match the known gas concentration. Follow the instructions to make the necessary adjustments during the process of calibrating a scuba oxygen analyzer.
  7. Verify accuracy after calibrating a scuba oxygen analyzer: Perform a verification test using a gas with a known concentration to ensure the analyzer is providing accurate readings.
  8. Record calibration data: Document the calibration date, gas concentrations used, and any other relevant information for future reference during the process of calibrating a scuba oxygen analyzer.
  9. Perform regular maintenance: Regularly check and calibrate the scuba oxygen analyzer according to the manufacturer’s recommendations to ensure continued accuracy.

Some Facts About What is a Scuba Oxygen Analyzer?

  • ✅ Scuba oxygen analyzers are essential devices used by divers to measure the oxygen content in their scuba tanks.
  • ✅ The Forensics Detectors O2BOX oxygen analyzer is a popular choice among divers and non-divers due to its ease of use, accuracy, and stability.
  • ✅ Oxygen analyzers come in various configurations, including portable, panel mount, weather-resistant box, alarm, providing flexibility to suit different needs.
  • ✅ Scuba oxygen analyzers are designed to withstand water and impact (check IP ratings), making them suitable for everyday use in the marine environment.
  • ✅ It is crucial to regularly test flow restrictors with a flow meter to ensure accurate gas analysis, as inaccurate gas analysis can have serious consequences.