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D2 Miniature Sensors

D2 Miniature Sensors

Product catalog summary

Introduction
The document discusses the specifications and performance of a dual Carbon Monoxide (CO) and Hydrogen Sulfide (H2S) sensor developed by Alphasense. This sensor is designed for use in multigas portable personal safety monitors, which are widely used across various industries.

Performance Specifications
Carbon Monoxide Channel:

Sensitivity: 30 to 55 nA/ppm in 400ppm CO.
Response Time: Less than 25 seconds from zero to 400ppm CO.
Zero Current: Less than ±6 ppm equivalent in zero air.
Resolution: 1 ppm equivalent rms noise.
Range: Up to 1000 ppm CO with a performance warranty.
Linearity: Less than 40 ppm error at full scale, linear at zero and 400 ppm CO.
Overgas Range: Stable response up to 5000 ppm CO.
Operating Life: 24 months until 80% of the original signal.

Hydrogen Sulfide Channel:

Sensitivity: 90 to 150 nA/ppm in 20ppm H2S.
Response Time: Less than 30 seconds from zero to 20ppm H2S at 20°C.
Zero Current: Less than ±0.6 ppm equivalent in zero air.
Resolution: 0.25 ppm equivalent rms noise.
Range: Up to 100 ppm H2S with a performance warranty.
Linearity: 0 to -9 ppm error at full scale, linear at zero and 20ppm H2S.
Overgas Range: Stable response up to 400 ppm H2S.
Operating Life: 24 months until 80% of the original signal.

Environmental Specifications

Temperature Range: -30°C to 50°C.
Pressure Range: 80 to 120 kPa.
Humidity Range: 15% to 90% rh continuous.
Storage Period: 6 months at 3 to 20°C in a sealed pot.

Cross Sensitivity

H2S Sensitivity: Less than 5% measured gas at 20ppm H2S.
NO Sensitivity: Less than 50% measured gas at 50ppm NO.
NO2, Cl2, SO2, NH3 Sensitivity: Less than 0.1% measured gas at respective ppm levels.
H2 Sensitivity: Less than 55% measured gas at 400ppm H2 at 20°C.

Figures and Data

Figures illustrate the temperature dependence of CO channel sensitivity and zero output, as well as the response to high CO concentrations.
Data shows the repeatable temperature dependence and robust sensor performance above specification limits.

Conclusion
The dual gas sensor by Alphasense offers a compact and cost-effective solution for measuring CO and H2S simultaneously, with robust performance and environmental resilience. It is suitable for integration into portable safety monitors, ensuring accurate calibration and reduced manufacturing costs.

D2 Miniature Sensors

D2 Miniature Sensors

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