They Are Not the Same Thing
Carbon Monoxide (CO)
• What it is: A colorless, odorless, non-irritating toxic gas produced by the incomplete combustion of natural gas, coal, wood, and other fuels.
• Hazard: It impairs the blood's ability to carry oxygen. Both long-term exposure at low concentrations and short-term exposure at high concentrations can be fatal.
• The key point: It is a byproduct of combustion — not the fuel itself.
Combustible Gas (Methane CH₄, LPG, etc.)
• What it is: The fuel itself — a highly flammable and explosive gas.
• Sources: Gas pipeline leaks, LPG tank valve leaks.
• Hazard: Once a leak reaches the lower explosive limit, it can easily cause a deflagration, while also displacing oxygen and risking asphyxiation.
• The key point: It is the fuel itself, and the leak originates from the piping.
⚠️Note: The people and scenes in the picture are AI-generated.
Why Can't a CO Sensor Detect Combustible Gas?
① Completely Different Sensing Principles
CO sensors: Mostly electrochemical, selectively responsive only to CO molecules. They are naturally insensitive to methane, propane, and other combustible gases — they simply "can't smell" natural gas by design.
Combustible gas sensors: Mostly catalytic combustion or semiconductor type (the MQ series), responsive to methane-class organics and insensitive to CO.
In one sentence: each sensor detects its own molecules — physically, they can't substitute for one another.
② Different Targets, Hazards, and Alarm Thresholds
③ It Leaves a "Fatal Blind Spot"
Dangerous scenarios with a CO sensor alone:
• An aging gas hose in the kitchen leaks → combustible gas escapes → the CO sensor shows nothing → concentration builds to the explosive limit → an accident happens.
• Conversely, with only a combustible gas detector, a CO spike (e.g., from incomplete combustion in a water heater) is also missed.
Missing either one is a potentially fatal blind spot.
Why Dual-Channel "CO + Combustible Gas" Monitoring Is a Must
How Our Product Solves Both Problems at Once
✅ Dual CO + Combustible Gas Sensors, Monitored Simultaneously in Real Time
CO range 0–999 PPM, accuracy ±5 PPM
Combustible gas range 0–600 PPM, accuracy ±5%
Refreshes every 2 seconds; both gases shown on the same display — no monitoring blind spots.
✅ One Screen, Everything in View — No More Cramped Displays
The HD large screen shows CO concentration and combustible gas concentration together, plus temperature and humidity (14°F–122°F, 5%–95%RH).
Four readings in one place — clear and prominent in the kitchen, bedroom, or living room.
✅ Plug and Play, No Batteries Needed
Compatible with 110V–220V US-standard outlets — just plug it in. Works in hotels, RVs, and basements.
No more constantly swapping batteries; 24-hour uninterrupted monitoring.
✅ Smart Audible and Visual Alarms as a Safety Net
CO > 50 PPM or combustible gas > 100 PPM immediately triggers an> 85 dB loud alarm.
Adjustable screen brightness: even with the screen off to save power, monitoring continues, with an indicator light flashing every 5 seconds to confirm "normal operation."
✅ Two Sensitivity Levels — S1 / S2 (Combustible Gas)
Indoors — kitchen, bedroom, living room — default to S1 for stability without false alarms.
Open, large spaces where leaks need to be caught more acutely — switch to S2 high sensitivity. Flexible and precise for different environments.
CO is a toxic gas; combustible gas is a flammable and explosive one. Their sensing principles differ, their threats differ, and their alarm criteria differ — neither can replace the other. Relying on a CO sensor alone to detect combustible gas leaves an open door in your fire-safety protection. Our 4-in-1 detector packs CO, combustible gas, temperature, and humidity into a plug-and-play, battery-free unit, with dual-channel 24/7 monitoring — for peace of mind in the kitchen, bedroom, hotel, or RV.
Link below 👇