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

• 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: Date Sheet File
Quantity:
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  • Carbon Monoxide + Hydrogen Sulfide Sensor (CO + H2S Sensor)
  • Carbon Monoxide + Hydrogen Sulfide Sensor (CO + H2S Sensor)
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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


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