Marine 4™ Gas Monitor

  • Robust and accurate portable gas detector – IP67 rated
  • Provides audible and visual alarms in the event of exposure to flammable or toxic gases
  • Detects and displays up to 4 gases simultaneously
  • Simple 1-button operation
  • ‘Crew-safe’ fail-safe sensor technology with 6-month data logging
  • Bump test with the ABC – Always Be Calibrated Solution
  • MED/ Type Approved

Marine 4™ Gas Detection

A robust and accurate portable gas detector, the Marine 4™ provides unrivaled protection in confined space applications, with audible and visual alarms in the event of exposure to flammable or toxic gases. Detecting and displaying up to 4 gases simultaneously, it is suitable for a host of applications in a variety of industries. The Marine 4™ can be configured to detect a combination of methane, oxygen, carbon monoxide, hydrogen sulphide, as well as other flammable gases.

Pre-entry checking can be carried out with the optional internal sampling pump and diffusion operation, ensuring maximum battery life in confined spaces. It has been MED “Wheel marked” for use on all vessels with a simple 1-button operation. The Marine 4™ is supplied with an integral pump with flexibility for pre-entry into deep tanks, holds and void spaces. This makes the Marine 4™ a personal and portable gas detector.

The Marine 4™ has ‘crew-safe’ fail-safe sensor technology. The detector is robustly constructed and built to last on ships. Crews can also easily change the sensor, saving you service time and money.

Want to detect more gasses? Please check out our Marine 5 gas detector or see our full portable gas detection range.

To order your Marine 4™ spares, take a look here.

Download our guide to calibration gas compliance


SOLAS Chapter XI-1/7 has seen the addition of new regulation:

“Every ship to which Chapter 1 applies shall carry an appropriate portable atmosphere testing instrument or instruments. As a minimum, these shall be capable of measuring concentrations of oxygen, flammable gases or vapours, hydrogen sulphide and carbon monoxide. Instruments carried under other requirements may satisfy this regulation. Suitable means shall be provided for the calibration of all such instruments.”

Marine 4™ Calibration vs Kettle

Guide to Portable Gas Detection

This guide outlines some of the issues associated with gas detection, what operators must be aware of in terms of regulations and the actual process of calibrating gas detection equipment. It also looks at the challenges faced by operators and how to significantly reduce costs while increasing safety and efficiency.


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We are dedicated to building a sustainable and profitable business while continuing to operate responsibly with honesty, integrity and fairness.

At Martek Marine, we are committed to establishing high ethical standards of behaviour and effective corporate governance. This defines our strategic and financial objectives. Corporate responsibility remains central to delivering our strategy and achieving our success.

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We aim to reduce the use of replacement parts and calibration to help overcome waste and excessive carbon emission.

Pioneering sustainable and innovative solutions for ship safety, performance and crew welfare