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Carbon Monoxide Sensor (CO Sensor) 4-Electrode - CO-B4

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• Sensitivity: 420 to 650nA/ppm at 2ppm CO
• Response time t90: < 25s from zero to 10ppm CO
• Temperature range: -30 to 50°C
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90 % rh continuous
• Storage period: 6 months @ 3 to 20°C
• Load resistor: 33 to 100 Ω
• Weight: < 13 g

Model Number: CO-B4
Data Sheet:

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Product Specification

CO-B4 Carbon Monoxide Sensor (CO Sensor) 4-Electrode Description
Alphasense Carbon Monoxide gas sensors operate using proven fuel cell technology.

Sensors are available in the following sizes:
A: 20mm diameter, the industry standard size for portable gas detectors
B: 32mm diameter package, the best choice for fixed site applications
C: 20mm diameter with extra height for additional filter material when measuring combustion gases
D: miniature, with proven long-term performance. Sensors for the next generation of 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. The ‘X’ sensors have low hydrogen sensitivity, as drop-in replacements for the standard ‘F’ sensors.

CO-B4 Carbon Monoxide Sensor (CO Sensor) 4-Electrode PERFORMANCE
Sensitivity	nA/ppm at 2ppm CO	420 to 650
Response time	t90 (s) from zero to 10ppm CO	< 25
Zero current	nA in zero air at 20℃	+30 to -130
Noise*	±2 standard deviations (ppb equivalent)	4
Range	ppm limit of performance warranty	1000
Linearity	ppb CO error at full scale, linear at zero, 500ppm CO	20 to 35
Overgas limit	maximum ppm for stable response to gas pulse	2000
* Tested with Alphasense ISB low noise circuit

CO-B4 Carbon Monoxide Sensor (CO Sensor) 4-Electrode 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-B4 Carbon Monoxide Sensor (CO Sensor) 4-Electrode ENVIRONMENTAL
Sensitivity @ -20℃	(% output @ -20℃/output @ 20℃) @ 5ppm CO	40 to 70
Sensitivity @ 50℃	(% output @ 50℃/output @ 20℃) @ 5ppm CO	110 to 125
Zero @ -20℃	nA	-30 to +30
Zero @ 50℃	nA	-50 to -200

CO-B4 Carbon Monoxide Sensor (CO Sensor) 4-Electrode CROSS SENSITIVITY
Filter capacity	ppm·hrs H2S	250,000
H2S	sensitivity % measured gas @ 5ppm H2S	< 1
NO2	sensitivity % measured gas @ 5ppm NO2	< 1
Cl2	sensitivity % measured gas @ 5ppm Cl2	< 1
NO	sensitivity % measured gas @ 5ppm NO	< -3
SO2	sensitivity % measured gas @ 5ppm SO2	< 0.1
H2	sensitivity % measured gas @ 100ppm H2 at 20 ℃	< 10
C2H4	sensitivity % measured gas @ 100ppm C2H4	< 1
NH3	sensitivity % measured gas @ 20ppm NH3	< 0.1

CO-B4 Carbon Monoxide Sensor (CO Sensor) 4-Electrode 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 (ISB circuit is recommended)	33 to 100
Weight	g	< 13

Matched Transmitter board for CO-B4 CO Sensor

Individual Sensor Board (ISB) Alphasense B4 4-Electrode Gas Sensors

The Individual Sensor Board (ISB) is designed for use with the Alphasense B4 family of four-electrode gas sensors. This potentiostat provides a dual channel voltage output.
A low noise bandgap provides the bias voltage for NO sensors and the ISB can measure both oxidising (CO, H2S, SO2 and NO) and reducing (O3 and NO2) gases.
The ISB is configured for specific sensors: NO, NO2, O3 and CO / H2S / SO2 .
Designed for low power applications, the ISB requires 3.5 to 6.4 stable DC supply at only 1mA.

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