A gas detector on site does not necessarily mean the right worker has it when confined-space work begins. If the sensor cannot detect the relevant hazard—or the user does not know what to do when it alarms—the number of devices says little about safety.

The aim of an expansion policy should be effective measurement and follow-up at each hazardous task, not merely more purchases. This article does not assume that a new duty to give the same device to every worker in every industry has been enacted. It separates current Korean requirements from proposed criteria for broader access.

Separate existing duties from policy expansion

Korea’s Occupational Safety and Health Standards Rules prescribe a confined-space work program, pre-work checks, measurement and evaluation of oxygen and harmful gases, ventilation and monitoring. A December 2025 amendment clarified that employers must provide measuring equipment to a designated measurer and keep measurement and evaluation records for three years. Measurement before work also applies when work resumes after a temporary stop. Rules, ministry explanation

These are duties within the legal scope of confined-space work; they do not automatically require an identical personal detector for every employee. Equally, meeting only the minimum legal scope does not remove gas hazards in other processes. Expansion should secure compliance first and then improve access for additional tasks identified through risk assessment.

Target tasks, not industry labels

Allocating devices only by industry or headcount may leave none available when a hazardous job starts. Inventory tasks such as cleaning a storage tank, repairing a manhole, opening a pipeline or restarting equipment after a shutdown—situations where gas can form or enter, or oxygen can be displaced. Routine operations and occasional maintenance at the same site can pose different risks.

Selection should consider location, expected gases and oxygen deficiency, frequency, simultaneous crews, night work and contractors. The ministry’s 2026 focused plan emphasizes pre-work checks for manholes and inspections of high-risk vessels, reactors and piping. It is a policy context for managing hazardous tasks, not an announcement of one detector model for all industries. Ministry plan

Supply measurement capability, not just one device

A portable detector can only measure what its sensors are designed to detect. Before selection, review safety data sheets, inert gases that may displace oxygen, and gases generated by decay, fermentation or cleaning. A normal reading does not prove that an unmeasured gas is absent.

Do not design a procedure in which the worker discovers the hazard only after entry. Air can differ by location in deep tanks and manholes, so define multiple pre-entry measurement points. Connect the result to ventilation, monitoring during work and repeat measurement when conditions may change. A reading informs a work-permit decision; a single reading cannot certify an entire space as safe. KOSHA guidance

Fund training and maintenance with procurement

A purchase-only budget does not keep devices usable. The measurer needs to understand sensor channels, alarm meanings, device fault checks, measurement locations, recording, stopping work and evacuation. The rules require employers to check the measurer’s understanding of device operation, measurement and air-quality assessment and provide necessary training. Rules

Each device also needs a plan for functional checks, calibration, sensor and battery replacement, and backup equipment, consistent with manufacturer instructions and site risks. A function test checks sensor and alarm response; calibration checks or adjusts the measured value against a reference. Specify who removes a failed device from service and when it may return.

Sharing or renting equipment may complement purchases for infrequent work. KOSHA’s One-Call service describes measurement and education support and loans of gas detectors, ventilation fans and supplied-air masks for confined-space work. A loan does not transfer the employer’s responsibility for pre-work checks and protective measures. KOSHA One-Call

Assess implementation, not only distribution

Imagine a crew cleaning septic tanks at several sites. Distribution could be 100%, yet risk remains if the device is with another crew, its battery is flat, or a replacement measurer has not been trained. Conversely, a smaller pool may be useful if devices are available when scheduled work starts and measurement, responses and maintenance are verified.

Use distinct indicators:

  • Access: Was a suitable device and measurer available at the hazardous task?

  • Use: Were measurement and evaluation done before work and before resumption?

  • Response: Did an unsafe result or alarm trigger ventilation, restricted entry or required protection?

  • Reliability: Were training, checks, calibration and withdrawal of failed devices managed?

  • Records: Can the measurer, time, place, result and action be traced?

Accident counts matter, but short-term changes alone do not prove the causal effect of device distribution. Work volume, reporting practices and the risk profile of participating sites must also be considered.

Action checklist

  • List confined spaces separately from other gas-hazard tasks at each site.

  • Check required sensor channels as processes, materials and tasks change.

  • Calculate access during simultaneous, night and contractor work.

  • Define pre-entry measurement points, measurement on resumption and monitoring during work.

  • Designate and train measurers in operation, fault checks and evaluation.

  • Assign responsibility for stopping work and follow-up after an alarm or unsafe result.

  • Track functional checks, calibration, repairs and backup equipment.

  • Link results and actions to work records and check legal retention duties.

  • Review actual measurement, response and maintenance—not just device counts.

Conclusion

Broader access to portable detectors can create more opportunities to identify hazards. Ownership, however, is not the same as safe work. Existing confined-space duties must be met while appropriate sensors, trained measurers, maintenance and follow-up are arranged for the tasks at risk.

The policy question should not end with “how many units were supplied?” Distribution becomes part of prevention when we can verify what was measured before hazardous work and what changed in response.

Sources