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CO-B4

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CO-B4

Product catalog summary

Performance Specifications

Sensitivity: 420 to 650 nA/ppm at 2ppm CO.
Response Time: Less than 15 seconds from zero to 10ppm CO.
Zero Current: -100 to +10 nA in zero air at 20°C.
Noise: ±2 standard deviations equivalent to 4 ppb.
Range: Performance warranty up to 1000 ppm.
Linearity: CO error at full scale, linear at zero, 500ppm CO is 20 to 35 ppb.
Overgas Limit: Stable response to gas pulse up to 2000 ppm.

Lifetime Specifications

Zero Drift: Less than ±100 ppb equivalent change per year in lab air.
Sensitivity Drift: Less than 10% change per year in lab air, tested monthly.
Operating Life: More than 36 months until 50% of the original signal, with a 24-month warranty.

Environmental Specifications

Sensitivity at -20°C: 45 to 70% output compared to 20°C at 5ppm CO.
Sensitivity at 50°C: 110 to 125% output compared to 20°C at 5ppm CO.
Zero at -20°C: 10 to 40 nA change from 20°C.
Zero at 50°C: -250 to -400 nA change from 20°C.

Cross Sensitivity

Filter Capacity: 250,000 ppm·hrs for H2S.
H2S Sensitivity: Less than 1% measured gas at 5ppm H2S.
NO2 Sensitivity: Less than 1% measured gas at 5ppm NO2.
Cl2 Sensitivity: Less than 1% measured gas at 5ppm Cl2.
NO Sensitivity: Less than -3% measured gas at 5ppm NO.
SO2 Sensitivity: Less than 0.1% measured gas at 5ppm SO2.
H2 Sensitivity: Less than 10% measured gas at 100ppm H2 at 20°C.
C2H4 Sensitivity: Less than 1% measured gas at 100ppm C2H4.
NH3 Sensitivity: Less than 0.1% measured gas at 20ppm NH3.

Key Specifications

Temperature Range: -30 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.
Load Resistor: 33 to 100 Ω (ISB circuit recommended).
Weight: Less than 13 g.

Additional Notes

All sensors are tested at ambient environmental conditions with a 10 ohm load resistor unless otherwise stated.
Customers should test under their own conditions to ensure suitability for their requirements.
Contact Alphasense for disposal instructions at the end of the product's life.

Catalog excerpts

C0-B4 Carbon Monoxide Sensor Figure 1 C0-B4 Schematic Diagram Sensing area Bottom View Side View Response time Zero current Overgas limit ±2 standard deviations (ppb equivalent) ppm limit of performance warranty ppb CO error at full scale, linear at zero, 500ppm CO maximum ppm for stable response to gas pulse Tested with Alphasense ISB low noise circuit 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 CROSS SENSITIVITY Pressure range Humidity range Storage period Load resistor months @ 3 to 20°C (stored in sealed pot) At the end of the product's life, do not dispose of any electronic sensor, component or instrument in the domestic waste, but contact the instrument manufacturer, Alphasense or its distributor for disposal instructions. NOTE: all sensors are tested at ambient environmental conditions, with 10 ohm load resistor, unless otherwise stated. As applications of use are outside our control, the information provided is given without legal responsibility. Customers should test under their own conditions, to ensure that the sensors are suitable for their own Alphasense Ltd, Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. CM77 7AA. UK

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CO-B4 Performance Data Perf erformance Data Figure 2 Sensitivity Temperature Dependence Figure 2 shows the temperature dependence of sensitivity at 2ppm CO. This data is taken from a typical batch of sensors. Figure 3 Zero Current Temperature Dependence (corrected) 100 Figure 3 shows the variation in zero output of the working electrode caused by changes in temperature, expressed as nA. This data is taken from a typical batch of sensors. Contact Alphasense for futher information on zero current correction. Figure 4 shows response from 0 to 1ppm CO. Use of Alphasense ISB circuit reduces noise...

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CO-B4

CO-B4

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