Low Oxygen Level Warning Sign HS0046

Low Oxygen Level Sign HS0046

The Low Oxygen Level sign HS0046 is the standard ISO 7010 pictogram for Low oxygen level, a black-on-yellow warning triangle marking spaces where the breathable atmosphere may fall below a safe oxygen concentration. Rather than an acute emergency alert, this low oxygen level sign supports ongoing atmosphere monitoring — a permanent reminder posted at entry points to tanks, holds and other enclosed spaces where oxygen is checked and logged before and during occupancy. It is meant for crew, riggers, surveyors and permit-to-work holders who need a constant cue that gas-free certification and continuous testing apply.

Within Safety Sign Hub’s Hazard Signs range, HS0046 sits alongside the ship’s other atmosphere-hazard signage as the marker for spaces under routine oxygen surveillance rather than sudden-onset gas emergencies. Typical shipboard locations include ballast tanks, cargo holds, cofferdams, void spaces, chain lockers and pump rooms named on the vessel’s enclosed space entry permit. Fitted at hatch covers, manholes and access ladders, the low oxygen level sign works alongside the gas-free certificate posted for that space, reminding anyone approaching that testing results, not assumption, determine whether entry is safe.

Like the rest of the range, HS0046 is produced on rigid, marine-grade board or as a durable self-adhesive laminate, with a photoluminescent option for spaces with poor or emergency-only lighting. Every low oxygen level sign in this format resists saltwater spray, humidity and UV exposure, so the pictogram stays legible for the working life of the compartment it protects.

Why Low Oxygen Level Matters

Oxygen deficiency is one of the leading causes of death in enclosed spaces at sea, and it rarely announces itself — a normal-looking compartment can already sit well below the oxygen level the body needs, with no smell, colour or other warning. A clearly posted low oxygen level sign keeps that risk in front of every crew member and contractor before they reach for a hatch or manhole cover, reinforcing that entry depends on a current gas-free certificate rather than how the space looks. Consistent signage also supports safety rounds and internal audits, giving officers an easy check that testing requirements have not lapsed.

Compliance and Certification

HS0046 reproduces the pictogram exactly as it appears in ISO 7010, the international standard governing registered graphical symbols for safety signs, so the design is recognised by crew regardless of nationality or first language. Its use fits within general IMO guidance for shipboard safety signs and SOLAS’s requirement that hazards be clearly and permanently marked wherever they exist on board. Port State Control officers and classification society surveyors routinely check enclosed space entry points during inspections, and a missing or faded warning sign can be flagged as a deficiency. Full technical detail on the registered symbol set is available from the International Organization for Standardization.

Installation Recommendations

Mount HS0046 beside every access point to a space subject to routine atmosphere testing — hatch coamings, manhole covers, tank tops and the entrances to cofferdams and void spaces — at a height where it is seen before the cover is opened, not after. Where a space carries a gas-free certificate holder or permit board, position the sign beside that board so the hazard warning and testing results are read together. In poorly lit compartments, choose the photoluminescent version so the warning stays visible if main power is lost.

• Reproduces the registered ISO 7010 pictogram for Low oxygen level
• Rigid marine-grade board or self-adhesive laminate, with photoluminescent option
• Saltwater, UV and humidity resistant for long-term outdoor and below-deck use
• Distinct atmosphere-monitoring focus, separate from acute oxygen-emergency signage
• Sized for hatch coamings, manholes, tank access and confined-space entry points

Order the low oxygen level sign HS0046 to keep every enclosed space on your vessel marked and audit-ready. Browse the full Hazard Signs range for related shipboard warnings, including SKU HS0034-B, “Lack of oxygen”, for acute oxygen-emergency situations, or check the Fire Fighting Signs category to complete your safety signage.