Introduction
The document presents a preliminary specification for Alphasense Ltd's new solid-state carbon dioxide sensor, which is the result of extensive research into potentiometric gas sensors. The sensor is designed to operate as a gas ion selective electrode (ISE) and is currently available in the D Family size, with plans for a 2025 button cell version.

Performance Specifications

• CO2 Concentration Range: 100 ppm to over 90%
• Response Time: 2-4 minutes for a 90% change at 20°C
• Linearity: Logarithmic (refer to Figure 3)
• Sensitivity: 10 mV per decade concentration change (Nernstian slope)
• Zero Eo at 5000 ppm: -30 to +30 mV

Environmental Specifications

• Temperature Dependence: Offset shift of +6 mV from 10°C to 20°C, and -3 mV from 20°C to 30°C
• Temperature Range: 10°C to 30°C (potential for extension)
• Humidity Range: 15% to 80% relative humidity (continuous)

Key Features

• Operates at room temperature
• Requires no power
• Compact size
• Measures a wide range of CO2 concentrations
• Cost-effective

Market Applications

• Combustion Analysis
• Safety
• Industrial Process Control

Additional Information
The sensor's potentiometric nature allows it to operate over four decades of CO2 concentration, with optimal sensitivity at higher concentrations. While sensitivity remains stable over time, regular zeroing is recommended due to potential offset voltage shifts. For further details, Alphasense Ltd can be contacted via their website or through direct communication channels provided in the document.

Disclaimer
Alphasense Ltd reserves the right to modify design features and specifications without prior notice. The information provided is for guidance only, and the company accepts no liability for any losses or damages resulting from its use.