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Carbon Monoxide + Hydrogen Sulfide Sensor (CO + H2S Sensor) - CO/H2S-D2

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• Range: 1000 ppm CO limit of performance warranty
• Range: 100 ppm H2S limit of performance warranty
• Sensitivity: 27 to 55 nA/ppm in 400ppm CO
• Sensitivity: 90 to 160 nA/ppm in 20ppm H2S
• Response time t90: < 25 (s) from zero to 400ppm CO
• Response time t90: < 30 (s) from zero to 20ppm H2S @ 20℃
• Temperature range: -30 to 50℃
• Humidity range: 15 to 90 %rh continuous

Model Number: CO/H2S-D2
Data Sheet:

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Product Specification

CO/H2S-D2 Miniature Size Carbon Monoxide + Hydrogen Sulfide Sensor Introduction
The world wide use of multigas, portable, personal safety monitors has grown since the 1970s to include an ever increasing number of industries. The one requirement in common to the majority of these instruments is the need to measure both Carbon Monoxide and Hydrogen Sulfide simultaneously.

Alphasense now offers a compact, dual gas sensor which allows designers to reduce significantly instrument size and cost. The D2 sensor provides a unique approach to the dual gas sensor in both its size and working electrode configuration. The use of a high capacity filter over the Carbon Monoxide working electrode eliminates Hydrogen Sulfide cross sensitivity to Carbon Monoxide.

Proven in the field over many years, these sensors perform well even under long term, challenging conditions.

D2 Specification Carbon Monoxide Channel

Carbon Monoxide Sensor PERFORMANCE
Sensitivity	nA/ppm in 400ppm CO	27 to 55
Response time	t90 (s) from zero to 400ppm CO	< 25
Zero current	ppm equivalent in zero air	< ± 6
Resolution	rms noise (ppm equivalent)	1
Range	ppm CO limit of performance warranty	1000
Linearity	ppm error at full scale, linear at zero and 400 ppm CO	< 40
Overgas limit	maximum CO for stable response to gas pulse	5000

Carbon Monoxide Sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	< 0.5
Sensitivity drift	% change/year in lab air, monthly test	< 4
Operating life	months until 80% original signal (24 month warranted)	24

Carbon Monoxide Sensor ENVIRONMENTAL
Sensitivity @ -20℃	% (output @ -20℃/output @ 20℃) @ 100ppm CO	45 to 70
Sensitivity @ 50℃	% (output @ 50℃/output @ 20℃) @ 100ppm CO	105 to 125
Zero @ -20℃	ppm equivalent change from 20℃	-1 to 1
Zero @ 50℃	ppm equivalent change from 20℃	-1 to 4

Carbon Monoxide Sensor CROSS SENSITIVITY
Filter Capacity	ppm-hours of Hydrogen Sulfide	15,000
H2S sensitivity	% measured gas @ 20ppm H2S	< 8
NO2 sensitivity	% measured gas @ 10ppm NO2	< 0.1
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< 0.1
NO sensitivity	% measured gas @ 50ppm NO	< 50
SO2 sensitivity	% measured gas @ 20ppm SO	< 0.1
H2 sensitivity	% measured gas @ 400ppm H2 @ 20℃	< 55
C2H4 sensitivity	% measured gas @ 400ppm C2H4	< 200
NH3 sensitivity	% measured gas @ 20ppm NH3	< 0.1

Carbon Monoxide Sensor KEY SPECIFICATIONS
Temperature range	℃	-30 to 50
Pressure range	kPa	80 to 120
Humidity range	%rh continuous (see note below)	15 to 90
Storage period	months @ 3 to 20℃ (stored in sealed pot)	6
Load resistor	Ω (recommended)	10 to 47
Weight	g	< 2

D2 Specification Hydrogen Sulfide Channel

Hydrogen Sulfide Sensor PERFORMANCE
Sensitivity	nA/ppm in 20ppm H2S	90 to 160
Response time	t90 (s) from zero to 20ppm H2S @ 20℃	< 30
Zero current	ppm equivalent in zero air	< ± 1
Resolution	rms noise (ppm equivalent)	<0.25
Range	ppm H2S limit of performance warranty	100
Linearity	ppm error at full scale, linear at zero and 20ppm H2S	0 to -9
Overgas limit	maximum ppm H2S for stable response to gas pulse	400

Hydrogen Sulfide Sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	< 0.1
Sensitivity drift	% change/year in lab air, monthly test	< 2
Operating life	months until 80% original signal (24 month warranted)	24

Hydrogen Sulfide Sensor ENVIRONMENTAL
Sensitivity @ -20℃	% (output @ -20℃/output @ 20℃) @ 20ppm H2S	75 to 90
Sensitivity @ 50℃	% (output @ 50℃/output @ 20℃) @ 20ppm H2S	103 to 112
Zero @ -20℃	ppm equivalent change from 20℃	-0.3 to 0.2
Zero @ 50℃	ppm equivalent change from 20℃	< ±1

Hydrogen Sulfide Sensor CROSS SENSITIVITY
NO2 sensitivity	% measured gas @ 10ppm NO2	< -10
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< -10
NO sensitivity	% measured gas @ 50ppm NO	< 10
SO2 sensitivity	% measured gas @ 20ppm SO2	< 10
CO sensitivity	% measured gas @400ppm CO	< 2
H2 sensitivity	% measured gas @400ppm H2	< 1
C2H4 sensitivity	% measured gas @400ppm C2H4	<1
NH3 sensitivity	% measured gas @ 20ppm NH3	0