The AlphaSense COH-A2 2sense Dual Gas Sensor detects both carbon monoxide and hydrogen sulfide in a single sensor. It is designed for OEM manufactures who need to measure both gases as well as a replacement sensor for several models of personal gas safety monitors.
Features
Low Cross-Sensitivity
No external power required
Proven and tested design
This 20mm diameter, 4-pin sensor is the industry standard size for portable gas detectors.
The 2sense does not compromise performance or long term stability over the standard two-sensor solution when measuring both H2S and CO.
Specifications - Carbon Monoxide
Sensitivity: nA/ppm in 400ppm CO 50 to 100
Response time: tgo (s) from zero to 400ppm CO < 35
Zero current: ppm equivalent in zero air -3 to +3.5
Resolution: rms noise (ppm equivalent) < 0.5
Range: ppm CO limit of performance warranty 1,000
Linearity: ppm error at full scale, linear at zero and 400 ppm CO 10 to 40
Overgas limit: maximum CO for stable response to gas pulse 5,000
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
Sensitivity@ -20°C % (output@ -20°C/output@ 20°C) @ 1 00ppm CO 30 to 50
Sensitivity@ 50°C % (output@ 50°C/output@ 20°c)@ 100ppm CO 120 to 145
Zero@ -20°C ppm equivalent change from 20°c 0 to 5
Zero@ 50°C ppm equivalent change from 20°c 30 to 50 120 to 145 0 to -5
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: olms (recommended) 10 to 47
Weight grams: < 6
CROSS SENSITIVITY
Filter Capacity: ppm-hours of Hydrogen Sulfide 1200
H2S sensitivity % measured gas@ 20ppm H2S < 12
H2 sensitivity % measured gas@ 400ppm H2@ 20°C < 8
NO2 sensitivity % measured gas@ 10ppm NO2 <3
Cl2 sensitivity % measured gas@ 10ppm Cl2 < 0.1
NO sensitivity % measured gas@ 50ppm NO < 100
SO2 sensitivity % measured gas@ 20ppm SO2 <2
C2H4 sensitivity % measured gas@ 400ppm C2H4 < 60
NH3 sensitivity % measured gas@ 20ppm NH3 < 6
Specifications - Hydrogen Sulfide
Sensitivity: nA/ppm in 20ppm H2S 450 to 1000
Response time: tgo (s) from zero to 20ppm H2S@ 20°c < 30
Zero current: ppm equivalent in zero air ± 0.25
Resolution: rms noise (ppm equivalent) < 0.1
Range: ppm H2S limit of performance warranty 100
Linearity: ppm error at full scale, linear at zero and 20ppm H2S <± 5
Overgas limit: maximum ppm H2S for stable response to gas pulse 200
Lifetime Zero drift: ppm equivalent change/year in lab air < 0.1
Lifetime Sensitivity drift: % change/year in lab air, monthly test < 2
Operating life: months until 80% original signal (24 month warranted) 24
Sensitivity@ -20°C % (output@ -20°C/output@ 20°C)@ 20ppm H2S 75 to 90
Sensitivity@ 50°C % (output@ 50°C/output@ 20°c) @ 20ppm H2s 100 to 112
Zero @ -20°C ppm equivalent change from 20°c ±0.05
Zero @ 50°C ppm equivalent change from 20°c
Cross Sensitivity
NO2 sensitivity: % measured gas@ 10ppm NO2 < -30
Cl2 sensitivity % measured gas@ 10ppm Cl2 < -25
NO sensitivity % measured gas@ 50ppm NO < 30
S02 sensitivity % measured gas@ 20ppm SO2 < 30
CO sensitivity % measured gas@ 400ppm CO < 1.5
H2 sensitivity % measured gas@ 400ppm H2 < 0.3
C2H4 sensitivity % measured gas@ 400ppm C2H4 < 0.2
NH3 sensitivity % measured gas@ 20ppm NH3 <2
Warranty
90 Days. See GasLab Terms and Conditions
The AlphaSense COH-A2 2sense Dual Gas Sensor detects both carbon monoxide and hydrogen sulfide in a single sensor. It is designed for OEM manufactures who need to measure both gases as well as a replacement sensor for several models of personal gas safety monitors.
Features
- Low Cross-Sensitivity
- No external power required
- Proven and tested design
This 20mm diameter, 4-pin sensor is the industry standard size for portable gas detectors.
The 2sense does not compromise performance or long term stability over the standard two-sensor solution when measuring both H2S and CO.
Specifications - Carbon Monoxide
- Sensitivity: nA/ppm in 400ppm CO 50 to 100
- Response time: tgo (s) from zero to 400ppm CO < 35
- Zero current: ppm equivalent in zero air -3 to +3.5
- Resolution: rms noise (ppm equivalent) < 0.5
- Range: ppm CO limit of performance warranty 1,000
- Linearity: ppm error at full scale, linear at zero and 400 ppm CO 10 to 40
- Overgas limit: maximum CO for stable response to gas pulse 5,000
- 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
- Sensitivity@ -20°C % (output@ -20°C/output@ 20°C) @ 1 00ppm CO 30 to 50
- Sensitivity@ 50°C % (output@ 50°C/output@ 20°c)@ 100ppm CO 120 to 145
- Zero@ -20°C ppm equivalent change from 20°c 0 to 5
- Zero@ 50°C ppm equivalent change from 20°c 30 to 50 120 to 145 0 to -5
- 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: olms (recommended) 10 to 47
- Weight grams: < 6
CROSS SENSITIVITY
- Filter Capacity: ppm-hours of Hydrogen Sulfide 1200
- H2S sensitivity % measured gas@ 20ppm H2S < 12
- H2 sensitivity % measured gas@ 400ppm H2@ 20°C < 8
- NO2 sensitivity % measured gas@ 10ppm NO2 <3
- Cl2 sensitivity % measured gas@ 10ppm Cl2 < 0.1
- NO sensitivity % measured gas@ 50ppm NO < 100
- SO2 sensitivity % measured gas@ 20ppm SO2 <2
- C2H4 sensitivity % measured gas@ 400ppm C2H4 < 60
- NH3 sensitivity % measured gas@ 20ppm NH3 < 6
Specifications - Hydrogen Sulfide
- Sensitivity: nA/ppm in 20ppm H2S 450 to 1000
- Response time: tgo (s) from zero to 20ppm H2S@ 20°c < 30
- Zero current: ppm equivalent in zero air ± 0.25
- Resolution: rms noise (ppm equivalent) < 0.1
- Range: ppm H2S limit of performance warranty 100
- Linearity: ppm error at full scale, linear at zero and 20ppm H2S <± 5
- Overgas limit: maximum ppm H2S for stable response to gas pulse 200
- Lifetime Zero drift: ppm equivalent change/year in lab air < 0.1
- Lifetime Sensitivity drift: % change/year in lab air, monthly test < 2
- Operating life: months until 80% original signal (24 month warranted) 24
- Sensitivity@ -20°C % (output@ -20°C/output@ 20°C)@ 20ppm H2S 75 to 90
- Sensitivity@ 50°C % (output@ 50°C/output@ 20°c) @ 20ppm H2s 100 to 112
- Zero @ -20°C ppm equivalent change from 20°c ±0.05
- Zero @ 50°C ppm equivalent change from 20°c <Oto 0.2
Cross Sensitivity
- NO2 sensitivity: % measured gas@ 10ppm NO2 < -30
- Cl2 sensitivity % measured gas@ 10ppm Cl2 < -25
- NO sensitivity % measured gas@ 50ppm NO < 30
- S02 sensitivity % measured gas@ 20ppm SO2 < 30
- CO sensitivity % measured gas@ 400ppm CO < 1.5
- H2 sensitivity % measured gas@ 400ppm H2 < 0.3
- C2H4 sensitivity % measured gas@ 400ppm C2H4 < 0.2
- NH3 sensitivity % measured gas@ 20ppm NH3 <2
Warranty
- 90 Days. See GasLab Terms and Conditions
