Original CITY 4CM 4CFC carbon monoxide sensor for mine detection CO
Parameters
4CM
Principle: Three-electrode electrochemistry (Working / Counter / Reference)
Detected gases: CO carbon monoxide
Range: 0~2000 ppm
Sensitivity: 70 ±15 nA/ppm
T90 response time (≤500ppm): ≤10 s @ 20°C
Recovery time (from 100 ppm to < 2 ppm): Typical < 30 s, maximum < 90 s
Baseline offset (clean air): <±2 ppm CO
Recommended load resistor: 5Ω, no bias voltage required (Bias=0V)
Size: Φ20.2mm, standard 4 series; Weight≈5g
Operating temperature: -40°C ~ 55°C
Humidity: 15~95% RH, condensation prohibited
Pressure: 80~120 kPa
Expected lifespan: 2 years in the air
Built-in filter membrane: activated carbon filter layer filters acidic gases such as SO₂, NO₂, and H₂S; filter layer capacity > 20,000 ppm·h
4CFC
Principle: Three-electrode electrochemistry (Working / Counter / Reference)
Detected gases: CO carbon monoxide
Range: 0~1000 ppm CO; Maximum overload: 2000 ppm
Sensitivity: 70 ±15 nA/ppm (0.07±0.015 μA/ppm)
T90 response time: ≤20 s @ 20°C
Clean air baseline: <±2 ppm CO equivalent
Zero drift (-40~50°C): < equivalent to 12 ppm CO
Linearity: ±5%; Repeatability: ±3%
Electrical: No bias voltage needed. Bias = 0V, recommended load resistance of 5Ω
Size: Φ20.2mm, Weight≈5g; Installation in any direction
Temperature: continuous operation at -20°C ~ 40°C; short intervals can reach -40 ~ 55°C
Humidity: 15~90% RH, condensation is prohibited
Pressure: 80~120 kPa (1 atm±10%)
Life expectancy: 2 years in air; Annual drift <5% FS
Built-in filter membrane: activated carbon filter layer, removes acidic gases and hydrocarbons, resists acrylonitrile poisoning, and has low hydrogen cross-interference
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