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Carbon Monoxide CO Gas Detection & Gas Detectors

Carbon Monoxide (CO) is a colorless, odorless, tasteless poisonous gas. It is a common industrial hazard resulting from incomplete burning of natural gas and any other material containing carbon such as gasoline, kerosene, oil, propane, coal, or wood.

Carbon Monoxide Gas DetectorTypical applications where dangerous levels of Carbon Monoxide (CO) might occur and benefit from a Carbon Monoxide gas detector are:

    • Boiler rooms
    • Breweries
    • Warehouses
    • Petroleum refineries
    • Pulp and Paper production
    • Steel production
    • Blast furnaces
    • Coke ovens
    • Wastewater Treatment plants
    • Landfills

Carbon Monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen.

Exposure Limits (Source: OSHA)

Following are Carbon Monoxide exposure limits that industries should be aware of when researching Carbon Monoxide gas detectors and gas detection systems.

Agency Exposure Limits
OSHA PEL (General Industry) 50 ppm TWA
OSHA PEL (Construction Industry) 50 ppm TWA
OSHA PEL (Maritime) 50 ppm TWA
NIOSH REL 35 ppm TWA; 200 ppm Ceiling
NIOSH IDLH 1,200 ppm


  • TWA = Time Weighted Average exposure concentration for a normal 8-hour workday and 40-hour workweek
  • STEL = Short Term Exposure Limit (Usually a 15-minute time-weighted average exposure that should not be exceeded at any time during a workday
  • NIOSH (National Institute for Occupational Safety and Health)
    • REL = Recommended Exposure Limit
    • IDLH = Immediately Dangerous to Life or Health Concentration
  • OSHA (Occupational Safety and Health Administration)
    • PEL = Permissible Exposure Limit
  • ACGIH (American Conference of Government Industrial Hygienists)
    • TLV = Threshold Limit Value

Sierra Monitor has several different Carbon Monoxide gas detectors dependent upon the application.