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Marine Gas Detector Tubes


Our range of single use, multi-pack gas tubes are designed with simplicity in mind. A simple snap is all it takes to monitor the gas levels in any area of your ship.


  • The most accurate detector tube system available
  • Clear, precise and easy-to-read colour change
  • Long tube shelf life (between 1 and 3 years)
  • Complies to British Standard BSEN1231:1997
  • No need for ATEX Approval
  • ISO registered
  • NATO approved
  • Temperature-controlled storage facilities
  • Batch number traceability

Accurate and Cost-Effective Gas Detection Tubes

Martek Marine offers a comprehensive range of gas detector tubes, providing a simple and effective solution for gas detection needs. Our gas detector tubes are designed to deliver accurate results, ensuring the safety of your crew and vessel in various marine environments.

Key Benefits of Martek Marine Gas Detector Tubes;

Accuracy: Our tubes are known for their high level of accuracy, providing precise gas detection results. With clear and easy-to-read colour changes, you can quickly and confidently assess gas levels in any area of your ship.

Cost-Effectiveness: We prioritise simplicity and affordability by offering single-use, multi-pack gas tubes. You can monitor gas levels without requiring complex equipment or additional specialist devices, ensuring your gas detection costs stay low.

Range of Mixtures: Our gas detection tubes come in various mixtures, allowing for top-level instant detection whenever required. They enable testing for gases outside the normal range of fixed gas detection systems, providing enhanced coverage and safety.

Compliance and Approval: Martek Marine Gas Detector Tubes comply with British Standard BSEN1231:1997, meeting the necessary quality and performance requirements. This approval standard ensures that our tubes have undergone testing and adhere to recognised industry standards, offering you peace of mind.

Contact our team directly to see how we can help with your gas detection requirements.

Martek Marine offers a comprehensive range of gas detector tubes, providing a simple and effective solution for gas detection needs

Gas Detection Tubes FAQs

Below are our customers’ most common questions about gas detection tubes. Should you have any other questions or wish to speak with a member of the team, please contact us directly.

What are gas detector tubes?

Gas detector tubes are single-use devices designed to detect and measure the presence of specific gases in the air. They are commonly used in various industries, including marine environments. Each tube contains a chemical reagent that undergoes a visible colour change when it comes into contact with a particular gas. By drawing a sample of air through the tube, the gas reacts with the reagent, causing the colour change. The magnitude of the colour change corresponds to the concentration of the gas being measured. Gas detector tubes provide a simple, cost-effective method for on-the-spot gas detection without complex equipment or calibration. They are widely used for monitoring gas levels in confined spaces, industrial settings, and other environments where gas detection is essential for safety and compliance.

Are gas detector tubes accurate?

Yes, gas detector tubes can provide accurate results when used correctly. They are designed to detect specific gases and provide a visible colour change indicating gas presence and concentration. The accuracy of gas detector tubes depends on various factors, including the quality and specificity of the reagent used in the tube, proper sampling techniques, and adherence to the manufacturer’s instructions.

It’s essential to follow the instructions carefully, including using the appropriate sampling pump and ensuring the correct sampling volume. While gas detector tubes offer a reliable and convenient method for gas detection, they may provide a different level of precision than more advanced gas detection instruments. Therefore, for applications requiring highly precise measurements, it may be necessary to use other types of gas detection equipment.

How do the gas tubes work?

Gas detector tubes, or colorimetric tubes, work based on the principle of colorimetric analysis. Here’s how they work;


  1. Tube Selection: Choose the appropriate gas detector tube based on the specific gas you want to detect. Each tube is designed to be selective to a particular gas.
  2. Tube Preparation: Prepare the gas detector tube for sampling by breaking any tips or caps per the manufacturer’s instructions. Some tubes may require an initial flush or purging to remove air contaminants.
  3. Tube Insertion: Attach the sampling pump to one end of the gas detector tube. Ensure a secure connection. Insert the other end of the tube into the sampling point or area where you want to measure the gas concentration.
  4. Sampling: Operate the sampling pump to draw a known volume of air or gas through the tube. The air or gas sample should pass through the chemical reagent inside the tube.
  5. Colour Change: A chemical reaction occurs when the air or gas sample comes into contact with the reagent. This reaction causes a visible colour change within the tube. The intensity of the colour change corresponds to the concentration of the target gas in the sample.
  6. Reading and Analysis: After the sampling is complete, remove the gas detector tube from the sampling point. Compare the reagent’s colour with the manufacturer’s calibration chart. The calibration chart typically indicates the gas concentration range associated with different colour intensities.
  7. Gas Concentration Determination: Determine the gas concentration by identifying the colour closest to the colour of the reagent in the tube. The corresponding concentration value on the calibration chart represents the approximate gas concentration in the sampled air or gas.

How long do the gas detector tubes last?

Gas detector tubes have a shelf life that typically ranges between 1 and 3 years. The specific shelf life may vary depending on the manufacturer and the detected gas type. It is important to check the expiration date or shelf life information provided by the manufacturer before using the tubes.

Using expired tubes may result in inaccurate readings or a diminished colour change response. Proper storage conditions can also affect the shelf life of the tubes. It is recommended to store the tubes in a temperature-controlled environment, away from direct sunlight and extreme temperatures, to maintain their effectiveness and prolong their shelf life.

Do the gas detector tubes comply with any standards?

Yes, gas detector tubes can comply with specific standards to ensure quality and performance. One common standard for gas detector tubes is the British Standard BSEN1231:1997. Compliance with this standard indicates that the tubes meet the requirements for accuracy and reliability in gas detection. It’s essential to check the product specifications or consult the manufacturer to confirm whether the gas detector tubes comply with any particular standards.

Different manufacturers may adhere to different standards or have internal quality control measures. Compliance with recognised standards assures that the gas detector tubes have undergone testing and meet certain performance criteria.

Can the gas detection tubes be a backup to fixed gas detectors?

Yes, gas detection tubes can be a reliable backup to fixed gas detectors. Fixed gas detectors are typically installed in specific areas of a facility or vessel to monitor gas levels continuously. However, they may occasionally require maintenance, calibration or experience technical issues.

In such situations, gas detection tubes can be used as a backup solution to maintain gas detection capability. Gas tubes provide a simple and portable method for on-the-spot gas detection without additional equipment or a complex setup. They can be easily deployed to quickly assess gas levels in specific areas when the fixed gas detectors are unavailable or undergoing maintenance.

Having gas detection tubes as a backup option adds an extra layer of safety and ensures continuous monitoring of gas levels. It’s important to have a proper inventory of gas detection tubes and ensure they are within their shelf life to be ready for any potential backup needs.

What gases do the gas tubes detect?

Gas detector tubes are available for detecting a wide range of gases. The specific gases that can be detected depend on the type of tube and the manufacturer. Some common gases that can be detected using gas detector tubes include:

  1. Hydrogen sulfide (H2S)
  2. Carbon monoxide (CO)
  3. Oxygen (O2)
  4. Sulfur dioxide (SO2)
  5. Nitrogen dioxide (NO2)
  6. Ammonia (NH3)
  7. Chlorine (Cl2)
  8. Formaldehyde (CH2O)
  9. Hydrogen cyanide (HCN)
  10. Ethylene oxide (ETO)
  11. Phosphine (PH3)
  12. Ozone (O3)
  13. Various volatile organic compounds (VOCs)

Choosing the appropriate gas detector tube that corresponds to the specific gas you wish to detect is important. Each gas detector tube is designed to be selective to a particular gas, allowing for targeted gas detection in various applications.

Register Your Interest

Get in touch now to register your interest in the marine gas detector tubes. Our friendly, professional team is waiting to help you with all your enquiries about gas detectors.

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