IMO New Rule: 5-in-1 Detector is Mandatory

IMO New Regulation Mandatory! 5-in-1 Detector Becomes a Must for Marine Confined Space Operations

On 3 December 2025, IMO MSC.581(110) officially entered into force!  

The full title of the resolution is **Revised Recommendations for Entering Enclosed Spaces on Board Ships**, applicable to all ship types.  

1 Three Core Mandatory Requirements of the New IMO Regulation, Understand the Upgrade Points in One Article

As the "first line of defense" for the safe operation of ships, the upgrade of gas detection equipment is urgently needed.  

It is crucial to clarify the following 3 points that determine whether the equipment is compliant:

01，Detection Range Must Be Upgraded

Expand from "4-in-1" to "5-in-1", mandatorily add a CO₂ detection module, and simultaneously monitor five types of gases: O₂, CO₂, combustible gas (LEL), CO, and H₂S, without exception;

02，Safety Threshold Clearly Defined

Before entering a confined space, the CO₂ concentration must be < 0.5% (5000ppm), O₂ ≥ 20.9%, combustible gas < 1% LFL, and toxic gas < 50% OEL Lower Explosive Limit (LEL), toxic gas/vapor < 50% of Occupational Exposure Limit (OEL). Entry is strictly prohibited if the data does not meet the standards;

03，Equipment Configuration and Operation Specifications

All ships must be equipped with at least 2 sets, and special cargo ships need additional equipment; support long-distance sampling, continuous monitoring throughout the process, and data must be recordable and traceable, and included in the entry permit document.

2 MST 410P: Accurately Adapt to New Regulations, Worry-Free Compliance

Faced with the strict requirements of the new regulations, the MST 410P Portable Pump Suction 5-in-1 Gas Detector from MaiYa Sensor, with its hard-core configuration, perfectly solves the three pain points of "incomplete detection, inaccurate data, and inconvenient operation", becoming the first choice for marine compliance:

01，5-in-1 Full Coverage, Directly Hit the Core Requirements of the New Regulation

The MST 410P provides one-stop accurate monitoring of the five types of gases (O₂, CO₂, combustible gas, CO, H₂S) mandatory required by the new regulations, without the need for additional equipment.  The detector is equipped with temperature compensation to eliminate interference caused by temperature changes and ensure accurate measurement.The CO₂ resolution can reach **1 ppm**, precisely controlling the safety threshold of **< 5000 ppm**.

02，Pump Suction Sampling + Flexible Accessories, Adapt to Complex Marine Scenarios

Marine confined spaces have complex structures, and areas such as cargo holds, ballast tanks, and chain lockers are narrow and difficult to reach. Traditional diffusion-type equipment cannot sample accurately. The MST 410P has a built-in high-efficiency air pump, which can be equipped with an extended sampling tube and float ball accessories to actively sample in narrow corners and underwater areas, without the need for personnel to contact dangerous environments at close range, fully complying with SOLAS Chapter XI-1/7 and MSC.1/Circ.1477 technical specifications.

03，Long Battery Life + Data Traceability, Adapt to Continuous Monitoring Needs

The new regulations require continuous monitoring throughout the operation, putting high demands on the battery life and data storage capacity of the equipment. The MST 410P can work continuously for more than 30 hours on a full charge (energy-saving mode), supporting event recording and data log storage. With Bluetooth data transmission function.Data can be quickly exported to local storage, realizing a full-process closed loop of "detection-recording-reporting", and easily coping with PSC inspections.

04，Durable Design + Intelligent Functions, Adapt to Harsh Marine Environments

The harsh marine environment of high humidity, salt spray, and vibration is a great test for the stability of the equipment. The MST 410P adopts a resistant rubber anti-static shell with an IP66 protection level and qualified explosion-proof performance, which can withstand harsh marine environments; the intelligent sensor supports plug-and-play and automatic identification at any position, making maintenance convenient; functions such as calibration overdue reminder and equipment self-diagnosis alarm ensure that the equipment is always in normal working condition, avoiding safety risks caused by equipment failures.

3 Industry Adaptation: Universal for All Ship Types, Worry-Free and Efficient

The MST 410P can be accurately adapted to all ship types, including bulk carriers, chemical tankers, general cargo ships, and ships transporting special goods such as grain and scrap metal:

Special Cargo Ships: Gas configuration can be customized freely, easily meeting various requirements.

Existing Ships: The device is ready to use right out of the box, easy to operate, and enables quick equipment upgrade.

Newly Built Ships: Meet the requirements of the new regulations in one step, avoiding subsequent secondary modification costs.