What Is Carbon Monoxide (CO)? The Silent Killer Explained
Carbon monoxide (CO) is a colorless, odorless, tasteless gas produced when carbon compounds burn incompletely in oxygen-deficient conditions. Known as the "Silent Killer", it cannot be detected by any of the five senses. Its affinity for hemoglobin is more than 250 times greater than oxygen, meaning even low concentrations can rapidly induce oxygen deprivation and death.
💡 Key Point
CO can occur in any enclosed space using combustion-based equipment — boiler rooms, generator rooms, parking garages, tunnels, wastewater plants, and steel mills. A significant proportion of industrial gas poisoning fatalities are caused by CO.
CO Health Effects by Concentration Level
| CO Level (ppm) | Exposure Duration | Health Effects | Risk Level |
|---|---|---|---|
| 35 | 8 hours | Headache, dizziness (TWA limit) | OSHA PEL |
| 200 | 2–3 hours | Severe headache, impaired judgment | Mild poisoning |
| 400 | 1 hour | Life-threatening, vomiting, loss of consciousness | Moderate poisoning |
| 800 | 45 minutes | Convulsions, unconsciousness | Severe poisoning |
| 1,600 | 20 minutes | Death | Immediately dangerous |
| 3,200+ | 5–10 minutes | Instant death | Extreme hazard |
※ Source: NIOSH, KOSHA Industrial Health Standards, 2023
Real Incident: CO Poisoning in Industrial Settings
Case 1 — 2020 Underground Parking Garage CO Fatality, Gyeonggi
In 2020, a ventilation system failure in an apartment building's underground parking garage in Gyeonggi-do caused CO levels to spike rapidly. A maintenance worker died from CO poisoning. No CO detector was present on-site, and by the time the worker noticed symptoms, exposure had already reached dangerous levels. (Source: Korea Occupational Safety and Health Agency Accident Case, 2020)
WANDI EDW500 — CO Detection with IECEx-Certified 5-Gas Monitor
EDW500 CO Detection Specifications
- Measurement Range: 0–1,000 ppm CO
- Alarm Thresholds: 1st: 25 ppm / 2nd: 50 ppm (adjustable)
- Sensor Type: Electrochemical (high sensitivity and selectivity)
- 5-Gas Simultaneous: EX + O₂ + CO + H₂S + CO₂
- IECEx Certified: TPS 25.0057X (TÜV SÜD), Zone 0 rated
- Cloud Connectivity: Real-time upload via LTE/WiFi
Accident Prevention Scenario with the EDW500
- 1CO 25 ppm First Alarm: Audible and vibration alarm triggers immediately when CO exceeds safe threshold
- 2Cloud Alert: Manager receives real-time smartphone notification of CO level breach
- 3Evacuation and Ventilation: Workers evacuate immediately; ventilation initiated; second alarm at 50 ppm for emergency response
- 4Data Recording: Automatic CO concentration logging for post-incident analysis and legal documentation