Carbon Monoxide (CO) Gas Sensor

MEASUREMENT

Operating Principle

4-electrode electrochemical

Nominal Range

0 to 2,000 ppm CO

Maximum Overload

4,000 ppm CO

Filter

To remove acid gases

Filter Capacity

> 100,000 ppm hours

(1000 ppm NO @ 200 ml/min)

Auxiliary Electrode

To compensate for maximum

2000 ppm H2 cross interference

Sensitivity*

75 ± 25 nA/ppm

Response Time (T90)*

< 40 seconds

Typical Net Range Baseline*

(clean air)

-2 to +17 ppm CO equivalent

Typical Net Baseline Shift

(+20°C to +40°C)

5 ppm CO equivalent

Repeatability

< 1% of signal

Linearity

Linear

ELECTRICAL

Resolution

Electronics dependent

1 ppm (based on City Technology recommended circuitry)

Recommended Load Resistor

10 Ω

Bias Voltage

0 mV or 250 mV

MECHANICAL

Housing Material

ABS

Weight

13 g (nominal)

Orientation Sensitivity

None

ENVIRONMENTAL

Operating Temperature Range

-20°C to +50°C

Storage Temperature

0°C to 20°C

 Operating Pressure Range

Atmospheric ± 10%

Pressure Coefficient

0.010% signal / mbar

Operating Humidity Range

15% to 90% non-condensing

LIFETIME

Long Term Sensitivity Drift

< 2% signal loss/month

Expected Operating Life

3 years in air

Storage Life

6 months in original packaging