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Carbon Monoxide Sensor CO Sensor 4-Electrode - CO-A4

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• Range: 500ppm limit of performance warranty
• Sensitivity: 220 to 375nA/ppm in 2ppm CO
• Response time t90: < 20s from zero to 10ppm CO
• Temperature range :-30 to 50 ℃
• Pressure range : 80 to 120 kPa
• Humidity range :15 to 90 % rh continuous
• Storage period : 6 months @ 3 to 20 ℃ (stored in sealed pot)
• Load resistor :33 to 100 Ω (AFE circuit is recommended)
• Weight : < 6g

Model Number: CO-A4
Data Sheet:

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Product Specification

CO-A4 Carbon Monoxide Sensor Description
Alphasense Carbon Monoxide gas sensors operate using proven fuel cell technology.

CO-A4 Carbon Monoxide Sensor sizes:
20mm diameter, the industry standard size for portable gas detectors

The Alphasense family of CO sensors have proven themselves in the field with long term stability and reliable operation, well beyond the two-year warranty, using our patented electrode technology.

CO-A4 Carbon Monoxide Sensor CO Sensor PERFORMANCE
Sensitivity	nA/ppm in 2ppm CO	220 to 375
Response time	t90 (s) from zero to 10ppm CO	< 20
Zero current	nA in zero air at 20°C	-100 to +10
Noise*	±2 standard deviations (ppb equivalent)	20
Range	ppm limit of performance warranty	500
Linearity	ppm CO error at full scale, linear at zero, 15ppm CO	< ± 1
Overgas limit	maximum ppm for stable response to gas pulse	2000
* Tested with Alphasense AFE low noise circuit

CO-A4 Carbon Monoxide Sensor CO Sensor LIFETIME
Zero drift	ppb equivalent change/year in lab air	< ±100
Sensitivity drift	% change/year in lab air, monthly test	< 10
Operating life	months until 50% original signal (24 month warranted)	> 36

CO-A4 Carbon Monoxide Sensor CO Sensor ENVIRONMENTAL
Sensitivity @ -20°C	(% output @ -20°C/output @ 20°C) @ 5ppm CO	50 to 85
Sensitivity @ 50°C	(% output @ 50°C/output @ 20°C) @ 5ppm CO	110 to 125
Zero @ -20°C	nA change from 20°C	10 to 40
Zero @ 50°C	nA change from 20°C	-120 to -200

CO-A4 Carbon Monoxide Sensor CO Sensor CROSS SENSITIVITY
Filter capacity	ppm·hrs H2S	250,000
H2S sensitivity	% measured gas @ 5ppm H2S	< 0.1
NO2 sensitivity	% measured gas @ 5ppm NO2	< -2
Cl2 sensitivity	% measured gas @ 5ppm Cl2	< 0.1
NO sensitivity	% measured gas @ 5ppm NO	< -2
SO2 sensitivity	% measured gas @ 5ppm SO2	< 0.1
H2 sensitivity	% measured gas @ 100ppm H2 at 20°C	< 10
C2H4 sensitivity	% measured gas @ 100ppm C2H4	< 0.5
NH3 sensitivity	% measured gas @ 20ppm NH3	< 0.1

CO-A4 Carbon Monoxide Sensor CO Sensor KEY SPECIFICATIONS
Temperature range	°C	-30 to 50
Pressure range	kPa	80 to 120
Humidity range	% rh continuous	15 to 90
Storage period	months @ 3 to 20°C (stored in sealed pot)	6
Load resistor	Ω (AFE circuit is recommended)	33 to 100
Weight	g	< 6

Matched Transmitter board for CO-A4 CO Sensor

Analogue Front End (AFE) Alphasense A4 Air Quality Sensors
The family of Analogue Front End (AFE) circuits are designed for use with the A4 air quality sensors. Connect the AFE with A4 sensors to your multtiplexed ADC and you are recording air quality data immediately.

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